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Add popper.js files

Benjamin Roth authored on13/04/2018 21:00:39
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src/Resources/public/js/lib/popper.js
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+/**!
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+ * @fileOverview Kickass library to create and place poppers near their reference elements.
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+ * @version 1.14.1
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+ * @license
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+ * Copyright (c) 2016 Federico Zivolo and contributors
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a copy
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+ * of this software and associated documentation files (the "Software"), to deal
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+ * in the Software without restriction, including without limitation the rights
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+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+ * copies of the Software, and to permit persons to whom the Software is
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+ * furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice shall be included in all
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+ * copies or substantial portions of the Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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+ * SOFTWARE.
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+ */
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+(function (global, factory) {
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+  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
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+    typeof define === 'function' && define.amd ? define(factory) :
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+      (global.Popper = factory());
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+}(this, (function () { 'use strict';
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+
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+  var isBrowser = typeof window !== 'undefined' && typeof document !== 'undefined';
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+  var longerTimeoutBrowsers = ['Edge', 'Trident', 'Firefox'];
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+  var timeoutDuration = 0;
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+  for (var i = 0; i < longerTimeoutBrowsers.length; i += 1) {
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+    if (isBrowser && navigator.userAgent.indexOf(longerTimeoutBrowsers[i]) >= 0) {
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+      timeoutDuration = 1;
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+      break;
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+    }
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+  }
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+
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+  function microtaskDebounce(fn) {
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+    var called = false;
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+    return function () {
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+      if (called) {
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+        return;
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+      }
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+      called = true;
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+      window.Promise.resolve().then(function () {
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+        called = false;
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+        fn();
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+      });
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+    };
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+  }
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+
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+  function taskDebounce(fn) {
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+    var scheduled = false;
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+    return function () {
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+      if (!scheduled) {
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+        scheduled = true;
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+        setTimeout(function () {
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+          scheduled = false;
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+          fn();
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+        }, timeoutDuration);
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+      }
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+    };
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+  }
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+
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+  var supportsMicroTasks = isBrowser && window.Promise;
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+
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+  /**
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+   * Create a debounced version of a method, that's asynchronously deferred
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+   * but called in the minimum time possible.
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+   *
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+   * @method
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+   * @memberof Popper.Utils
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+   * @argument {Function} fn
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+   * @returns {Function}
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+   */
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+  var debounce = supportsMicroTasks ? microtaskDebounce : taskDebounce;
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+
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+  /**
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+   * Check if the given variable is a function
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+   * @method
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+   * @memberof Popper.Utils
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+   * @argument {Any} functionToCheck - variable to check
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+   * @returns {Boolean} answer to: is a function?
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+   */
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+  function isFunction(functionToCheck) {
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+    var getType = {};
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+    return functionToCheck && getType.toString.call(functionToCheck) === '[object Function]';
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+  }
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+
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+  /**
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+   * Get CSS computed property of the given element
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+   * @method
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+   * @memberof Popper.Utils
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+   * @argument {Eement} element
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+   * @argument {String} property
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+   */
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+  function getStyleComputedProperty(element, property) {
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+    if (element.nodeType !== 1) {
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+      return [];
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+    }
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+    // NOTE: 1 DOM access here
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+    var css = getComputedStyle(element, null);
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+    return property ? css[property] : css;
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+  }
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+
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+  /**
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+   * Returns the parentNode or the host of the element
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+   * @method
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+   * @memberof Popper.Utils
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+   * @argument {Element} element
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+   * @returns {Element} parent
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+   */
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+  function getParentNode(element) {
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+    if (element.nodeName === 'HTML') {
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+      return element;
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+    }
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+    return element.parentNode || element.host;
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+  }
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+
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+  /**
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+   * Returns the scrolling parent of the given element
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+   * @method
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+   * @memberof Popper.Utils
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+   * @argument {Element} element
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+   * @returns {Element} scroll parent
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+   */
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+  function getScrollParent(element) {
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+    // Return body, `getScroll` will take care to get the correct `scrollTop` from it
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+    if (!element) {
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+      return document.body;
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+    }
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+
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+    switch (element.nodeName) {
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+      case 'HTML':
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+      case 'BODY':
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+        return element.ownerDocument.body;
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+      case '#document':
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+        return element.body;
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+    }
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+
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+    // Firefox want us to check `-x` and `-y` variations as well
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+
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+    var _getStyleComputedProp = getStyleComputedProperty(element),
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+      overflow = _getStyleComputedProp.overflow,
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+      overflowX = _getStyleComputedProp.overflowX,
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+      overflowY = _getStyleComputedProp.overflowY;
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+
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+    if (/(auto|scroll|overlay)/.test(overflow + overflowY + overflowX)) {
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+      return element;
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+    }
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+
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+    return getScrollParent(getParentNode(element));
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+  }
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+
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+  /**
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+   * Tells if you are running Internet Explorer
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+   * @method
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+   * @memberof Popper.Utils
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+   * @argument {number} version to check
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+   * @returns {Boolean} isIE
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+   */
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+  var cache = {};
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+
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+  var isIE = function () {
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+    var version = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 'all';
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+
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+    version = version.toString();
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+    if (cache.hasOwnProperty(version)) {
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+      return cache[version];
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+    }
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+    switch (version) {
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+      case '11':
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+        cache[version] = navigator.userAgent.indexOf('Trident') !== -1;
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+        break;
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+      case '10':
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+        cache[version] = navigator.appVersion.indexOf('MSIE 10') !== -1;
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+        break;
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+      case 'all':
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+        cache[version] = navigator.userAgent.indexOf('Trident') !== -1 || navigator.userAgent.indexOf('MSIE') !== -1;
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+        break;
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+    }
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+
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+    //Set IE
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+    cache.all = cache.all || Object.keys(cache).some(function (key) {
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+      return cache[key];
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+    });
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+    return cache[version];
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+  };
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+
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+  /**
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+   * Returns the offset parent of the given element
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+   * @method
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+   * @memberof Popper.Utils
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+   * @argument {Element} element
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+   * @returns {Element} offset parent
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+   */
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+  function getOffsetParent(element) {
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+    if (!element) {
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+      return document.documentElement;
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+    }
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+
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+    var noOffsetParent = isIE(10) ? document.body : null;
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+
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+    // NOTE: 1 DOM access here
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+    var offsetParent = element.offsetParent;
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+    // Skip hidden elements which don't have an offsetParent
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+    while (offsetParent === noOffsetParent && element.nextElementSibling) {
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+      offsetParent = (element = element.nextElementSibling).offsetParent;
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+    }
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+
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+    var nodeName = offsetParent && offsetParent.nodeName;
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+
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+    if (!nodeName || nodeName === 'BODY' || nodeName === 'HTML') {
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+      return element ? element.ownerDocument.documentElement : document.documentElement;
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+    }
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+
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+    // .offsetParent will return the closest TD or TABLE in case
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+    // no offsetParent is present, I hate this job...
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+    if (['TD', 'TABLE'].indexOf(offsetParent.nodeName) !== -1 && getStyleComputedProperty(offsetParent, 'position') === 'static') {
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+      return getOffsetParent(offsetParent);
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+    }
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+
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+    return offsetParent;
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+  }
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+
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+  function isOffsetContainer(element) {
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+    var nodeName = element.nodeName;
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+
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+    if (nodeName === 'BODY') {
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+      return false;
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+    }
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+    return nodeName === 'HTML' || getOffsetParent(element.firstElementChild) === element;
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+  }
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+
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+  /**
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+   * Finds the root node (document, shadowDOM root) of the given element
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+   * @method
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+   * @memberof Popper.Utils
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+   * @argument {Element} node
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+   * @returns {Element} root node
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+   */
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+  function getRoot(node) {
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+    if (node.parentNode !== null) {
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+      return getRoot(node.parentNode);
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+    }
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+
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+    return node;
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+  }
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+
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+  /**
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+   * Finds the offset parent common to the two provided nodes
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+   * @method
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+   * @memberof Popper.Utils
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+   * @argument {Element} element1
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+   * @argument {Element} element2
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+   * @returns {Element} common offset parent
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+   */
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+  function findCommonOffsetParent(element1, element2) {
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+    // This check is needed to avoid errors in case one of the elements isn't defined for any reason
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+    if (!element1 || !element1.nodeType || !element2 || !element2.nodeType) {
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+      return document.documentElement;
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+    }
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+
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+    // Here we make sure to give as "start" the element that comes first in the DOM
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+    var order = element1.compareDocumentPosition(element2) & Node.DOCUMENT_POSITION_FOLLOWING;
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+    var start = order ? element1 : element2;
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+    var end = order ? element2 : element1;
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+
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+    // Get common ancestor container
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+    var range = document.createRange();
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+    range.setStart(start, 0);
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+    range.setEnd(end, 0);
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+    var commonAncestorContainer = range.commonAncestorContainer;
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+
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+    // Both nodes are inside #document
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+
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+    if (element1 !== commonAncestorContainer && element2 !== commonAncestorContainer || start.contains(end)) {
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+      if (isOffsetContainer(commonAncestorContainer)) {
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+        return commonAncestorContainer;
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+      }
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+
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+      return getOffsetParent(commonAncestorContainer);
286 
+    }
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+
288 
+    // one of the nodes is inside shadowDOM, find which one
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+    var element1root = getRoot(element1);
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+    if (element1root.host) {
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+      return findCommonOffsetParent(element1root.host, element2);
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+    } else {
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+      return findCommonOffsetParent(element1, getRoot(element2).host);
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+    }
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+  }
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+
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+  /**
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+   * Gets the scroll value of the given element in the given side (top and left)
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+   * @method
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+   * @memberof Popper.Utils
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+   * @argument {Element} element
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+   * @argument {String} side `top` or `left`
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+   * @returns {number} amount of scrolled pixels
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+   */
305 
+  function getScroll(element) {
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+    var side = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'top';
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+
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+    var upperSide = side === 'top' ? 'scrollTop' : 'scrollLeft';
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+    var nodeName = element.nodeName;
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+
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+    if (nodeName === 'BODY' || nodeName === 'HTML') {
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+      var html = element.ownerDocument.documentElement;
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+      var scrollingElement = element.ownerDocument.scrollingElement || html;
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+      return scrollingElement[upperSide];
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+    }
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+
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+    return element[upperSide];
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+  }
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+
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+  /*
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+   * Sum or subtract the element scroll values (left and top) from a given rect object
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+   * @method
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+   * @memberof Popper.Utils
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+   * @param {Object} rect - Rect object you want to change
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+   * @param {HTMLElement} element - The element from the function reads the scroll values
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+   * @param {Boolean} subtract - set to true if you want to subtract the scroll values
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+   * @return {Object} rect - The modifier rect object
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+   */
329 
+  function includeScroll(rect, element) {
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+    var subtract = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
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+
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+    var scrollTop = getScroll(element, 'top');
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+    var scrollLeft = getScroll(element, 'left');
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+    var modifier = subtract ? -1 : 1;
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+    rect.top += scrollTop * modifier;
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+    rect.bottom += scrollTop * modifier;
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+    rect.left += scrollLeft * modifier;
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+    rect.right += scrollLeft * modifier;
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+    return rect;
340 
+  }
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+
342 
+  /*
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+   * Helper to detect borders of a given element
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+   * @method
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+   * @memberof Popper.Utils
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+   * @param {CSSStyleDeclaration} styles
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+   * Result of `getStyleComputedProperty` on the given element
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+   * @param {String} axis - `x` or `y`
349 
+   * @return {number} borders - The borders size of the given axis
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+   */
351 
+
352 
+  function getBordersSize(styles, axis) {
353 
+    var sideA = axis === 'x' ? 'Left' : 'Top';
354 
+    var sideB = sideA === 'Left' ? 'Right' : 'Bottom';
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+
356 
+    return parseFloat(styles['border' + sideA + 'Width'], 10) + parseFloat(styles['border' + sideB + 'Width'], 10);
357 
+  }
358 
+
359 
+  function getSize(axis, body, html, computedStyle) {
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+    return Math.max(body['offset' + axis], body['scroll' + axis], html['client' + axis], html['offset' + axis], html['scroll' + axis], isIE(10) ? html['offset' + axis] + computedStyle['margin' + (axis === 'Height' ? 'Top' : 'Left')] + computedStyle['margin' + (axis === 'Height' ? 'Bottom' : 'Right')] : 0);
361 
+  }
362 
+
363 
+  function getWindowSizes() {
364 
+    var body = document.body;
365 
+    var html = document.documentElement;
366 
+    var computedStyle = isIE(10) && getComputedStyle(html);
367 
+
368 
+    return {
369 
+      height: getSize('Height', body, html, computedStyle),
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+      width: getSize('Width', body, html, computedStyle)
371 
+    };
372 
+  }
373 
+
374 
+  var classCallCheck = function (instance, Constructor) {
375 
+    if (!(instance instanceof Constructor)) {
376 
+      throw new TypeError("Cannot call a class as a function");
377 
+    }
378 
+  };
379 
+
380 
+  var createClass = function () {
381 
+    function defineProperties(target, props) {
382 
+      for (var i = 0; i < props.length; i++) {
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+        var descriptor = props[i];
384 
+        descriptor.enumerable = descriptor.enumerable || false;
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+        descriptor.configurable = true;
386 
+        if ("value" in descriptor) descriptor.writable = true;
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+        Object.defineProperty(target, descriptor.key, descriptor);
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+      }
389 
+    }
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+
391 
+    return function (Constructor, protoProps, staticProps) {
392 
+      if (protoProps) defineProperties(Constructor.prototype, protoProps);
393 
+      if (staticProps) defineProperties(Constructor, staticProps);
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+      return Constructor;
395 
+    };
396 
+  }();
397 
+
398 
+
399 
+
400 
+
401 
+
402 
+  var defineProperty = function (obj, key, value) {
403 
+    if (key in obj) {
404 
+      Object.defineProperty(obj, key, {
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+        value: value,
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+        enumerable: true,
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+        configurable: true,
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+        writable: true
409 
+      });
410 
+    } else {
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+      obj[key] = value;
412 
+    }
413 
+
414 
+    return obj;
415 
+  };
416 
+
417 
+  var _extends = Object.assign || function (target) {
418 
+    for (var i = 1; i < arguments.length; i++) {
419 
+      var source = arguments[i];
420 
+
421 
+      for (var key in source) {
422 
+        if (Object.prototype.hasOwnProperty.call(source, key)) {
423 
+          target[key] = source[key];
424 
+        }
425 
+      }
426 
+    }
427 
+
428 
+    return target;
429 
+  };
430 
+
431 
+  /**
432 
+   * Given element offsets, generate an output similar to getBoundingClientRect
433 
+   * @method
434 
+   * @memberof Popper.Utils
435 
+   * @argument {Object} offsets
436 
+   * @returns {Object} ClientRect like output
437 
+   */
438 
+  function getClientRect(offsets) {
439 
+    return _extends({}, offsets, {
440 
+      right: offsets.left + offsets.width,
441 
+      bottom: offsets.top + offsets.height
442 
+    });
443 
+  }
444 
+
445 
+  /**
446 
+   * Get bounding client rect of given element
447 
+   * @method
448 
+   * @memberof Popper.Utils
449 
+   * @param {HTMLElement} element
450 
+   * @return {Object} client rect
451 
+   */
452 
+  function getBoundingClientRect(element) {
453 
+    var rect = {};
454 
+
455 
+    // IE10 10 FIX: Please, don't ask, the element isn't
456 
+    // considered in DOM in some circumstances...
457 
+    // This isn't reproducible in IE10 compatibility mode of IE11
458 
+    try {
459 
+      if (isIE(10)) {
460 
+        rect = element.getBoundingClientRect();
461 
+        var scrollTop = getScroll(element, 'top');
462 
+        var scrollLeft = getScroll(element, 'left');
463 
+        rect.top += scrollTop;
464 
+        rect.left += scrollLeft;
465 
+        rect.bottom += scrollTop;
466 
+        rect.right += scrollLeft;
467 
+      } else {
468 
+        rect = element.getBoundingClientRect();
469 
+      }
470 
+    } catch (e) {}
471 
+
472 
+    var result = {
473 
+      left: rect.left,
474 
+      top: rect.top,
475 
+      width: rect.right - rect.left,
476 
+      height: rect.bottom - rect.top
477 
+    };
478 
+
479 
+    // subtract scrollbar size from sizes
480 
+    var sizes = element.nodeName === 'HTML' ? getWindowSizes() : {};
481 
+    var width = sizes.width || element.clientWidth || result.right - result.left;
482 
+    var height = sizes.height || element.clientHeight || result.bottom - result.top;
483 
+
484 
+    var horizScrollbar = element.offsetWidth - width;
485 
+    var vertScrollbar = element.offsetHeight - height;
486 
+
487 
+    // if an hypothetical scrollbar is detected, we must be sure it's not a `border`
488 
+    // we make this check conditional for performance reasons
489 
+    if (horizScrollbar || vertScrollbar) {
490 
+      var styles = getStyleComputedProperty(element);
491 
+      horizScrollbar -= getBordersSize(styles, 'x');
492 
+      vertScrollbar -= getBordersSize(styles, 'y');
493 
+
494 
+      result.width -= horizScrollbar;
495 
+      result.height -= vertScrollbar;
496 
+    }
497 
+
498 
+    return getClientRect(result);
499 
+  }
500 
+
501 
+  function getOffsetRectRelativeToArbitraryNode(children, parent) {
502 
+    var fixedPosition = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
503 
+
504 
+    var isIE10 = isIE(10);
505 
+    var isHTML = parent.nodeName === 'HTML';
506 
+    var childrenRect = getBoundingClientRect(children);
507 
+    var parentRect = getBoundingClientRect(parent);
508 
+    var scrollParent = getScrollParent(children);
509 
+
510 
+    var styles = getStyleComputedProperty(parent);
511 
+    var borderTopWidth = parseFloat(styles.borderTopWidth, 10);
512 
+    var borderLeftWidth = parseFloat(styles.borderLeftWidth, 10);
513 
+
514 
+    // In cases where the parent is fixed, we must ignore negative scroll in offset calc
515 
+    if (fixedPosition && parent.nodeName === 'HTML') {
516 
+      parentRect.top = Math.max(parentRect.top, 0);
517 
+      parentRect.left = Math.max(parentRect.left, 0);
518 
+    }
519 
+    var offsets = getClientRect({
520 
+      top: childrenRect.top - parentRect.top - borderTopWidth,
521 
+      left: childrenRect.left - parentRect.left - borderLeftWidth,
522 
+      width: childrenRect.width,
523 
+      height: childrenRect.height
524 
+    });
525 
+    offsets.marginTop = 0;
526 
+    offsets.marginLeft = 0;
527 
+
528 
+    // Subtract margins of documentElement in case it's being used as parent
529 
+    // we do this only on HTML because it's the only element that behaves
530 
+    // differently when margins are applied to it. The margins are included in
531 
+    // the box of the documentElement, in the other cases not.
532 
+    if (!isIE10 && isHTML) {
533 
+      var marginTop = parseFloat(styles.marginTop, 10);
534 
+      var marginLeft = parseFloat(styles.marginLeft, 10);
535 
+
536 
+      offsets.top -= borderTopWidth - marginTop;
537 
+      offsets.bottom -= borderTopWidth - marginTop;
538 
+      offsets.left -= borderLeftWidth - marginLeft;
539 
+      offsets.right -= borderLeftWidth - marginLeft;
540 
+
541 
+      // Attach marginTop and marginLeft because in some circumstances we may need them
542 
+      offsets.marginTop = marginTop;
543 
+      offsets.marginLeft = marginLeft;
544 
+    }
545 
+
546 
+    if (isIE10 && !fixedPosition ? parent.contains(scrollParent) : parent === scrollParent && scrollParent.nodeName !== 'BODY') {
547 
+      offsets = includeScroll(offsets, parent);
548 
+    }
549 
+
550 
+    return offsets;
551 
+  }
552 
+
553 
+  function getViewportOffsetRectRelativeToArtbitraryNode(element) {
554 
+    var excludeScroll = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
555 
+
556 
+    var html = element.ownerDocument.documentElement;
557 
+    var relativeOffset = getOffsetRectRelativeToArbitraryNode(element, html);
558 
+    var width = Math.max(html.clientWidth, window.innerWidth || 0);
559 
+    var height = Math.max(html.clientHeight, window.innerHeight || 0);
560 
+
561 
+    var scrollTop = !excludeScroll ? getScroll(html) : 0;
562 
+    var scrollLeft = !excludeScroll ? getScroll(html, 'left') : 0;
563 
+
564 
+    var offset = {
565 
+      top: scrollTop - relativeOffset.top + relativeOffset.marginTop,
566 
+      left: scrollLeft - relativeOffset.left + relativeOffset.marginLeft,
567 
+      width: width,
568 
+      height: height
569 
+    };
570 
+
571 
+    return getClientRect(offset);
572 
+  }
573 
+
574 
+  /**
575 
+   * Check if the given element is fixed or is inside a fixed parent
576 
+   * @method
577 
+   * @memberof Popper.Utils
578 
+   * @argument {Element} element
579 
+   * @argument {Element} customContainer
580 
+   * @returns {Boolean} answer to "isFixed?"
581 
+   */
582 
+  function isFixed(element) {
583 
+    var nodeName = element.nodeName;
584 
+    if (nodeName === 'BODY' || nodeName === 'HTML') {
585 
+      return false;
586 
+    }
587 
+    if (getStyleComputedProperty(element, 'position') === 'fixed') {
588 
+      return true;
589 
+    }
590 
+    return isFixed(getParentNode(element));
591 
+  }
592 
+
593 
+  /**
594 
+   * Finds the first parent of an element that has a transformed property defined
595 
+   * @method
596 
+   * @memberof Popper.Utils
597 
+   * @argument {Element} element
598 
+   * @returns {Element} first transformed parent or documentElement
599 
+   */
600 
+
601 
+  function getFixedPositionOffsetParent(element) {
602 
+    // This check is needed to avoid errors in case one of the elements isn't defined for any reason
603 
+    if (!element || !element.parentElement || isIE()) {
604 
+      return document.documentElement;
605 
+    }
606 
+    var el = element.parentElement;
607 
+    while (el && getStyleComputedProperty(el, 'transform') === 'none') {
608 
+      el = el.parentElement;
609 
+    }
610 
+    return el || document.documentElement;
611 
+  }
612 
+
613 
+  /**
614 
+   * Computed the boundaries limits and return them
615 
+   * @method
616 
+   * @memberof Popper.Utils
617 
+   * @param {HTMLElement} popper
618 
+   * @param {HTMLElement} reference
619 
+   * @param {number} padding
620 
+   * @param {HTMLElement} boundariesElement - Element used to define the boundaries
621 
+   * @param {Boolean} fixedPosition - Is in fixed position mode
622 
+   * @returns {Object} Coordinates of the boundaries
623 
+   */
624 
+  function getBoundaries(popper, reference, padding, boundariesElement) {
625 
+    var fixedPosition = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : false;
626 
+
627 
+    // NOTE: 1 DOM access here
628 
+
629 
+    var boundaries = { top: 0, left: 0 };
630 
+    var offsetParent = fixedPosition ? getFixedPositionOffsetParent(popper) : findCommonOffsetParent(popper, reference);
631 
+
632 
+    // Handle viewport case
633 
+    if (boundariesElement === 'viewport') {
634 
+      boundaries = getViewportOffsetRectRelativeToArtbitraryNode(offsetParent, fixedPosition);
635 
+    } else {
636 
+      // Handle other cases based on DOM element used as boundaries
637 
+      var boundariesNode = void 0;
638 
+      if (boundariesElement === 'scrollParent') {
639 
+        boundariesNode = getScrollParent(getParentNode(reference));
640 
+        if (boundariesNode.nodeName === 'BODY') {
641 
+          boundariesNode = popper.ownerDocument.documentElement;
642 
+        }
643 
+      } else if (boundariesElement === 'window') {
644 
+        boundariesNode = popper.ownerDocument.documentElement;
645 
+      } else {
646 
+        boundariesNode = boundariesElement;
647 
+      }
648 
+
649 
+      var offsets = getOffsetRectRelativeToArbitraryNode(boundariesNode, offsetParent, fixedPosition);
650 
+
651 
+      // In case of HTML, we need a different computation
652 
+      if (boundariesNode.nodeName === 'HTML' && !isFixed(offsetParent)) {
653 
+        var _getWindowSizes = getWindowSizes(),
654 
+          height = _getWindowSizes.height,
655 
+          width = _getWindowSizes.width;
656 
+
657 
+        boundaries.top += offsets.top - offsets.marginTop;
658 
+        boundaries.bottom = height + offsets.top;
659 
+        boundaries.left += offsets.left - offsets.marginLeft;
660 
+        boundaries.right = width + offsets.left;
661 
+      } else {
662 
+        // for all the other DOM elements, this one is good
663 
+        boundaries = offsets;
664 
+      }
665 
+    }
666 
+
667 
+    // Add paddings
668 
+    boundaries.left += padding;
669 
+    boundaries.top += padding;
670 
+    boundaries.right -= padding;
671 
+    boundaries.bottom -= padding;
672 
+
673 
+    return boundaries;
674 
+  }
675 
+
676 
+  function getArea(_ref) {
677 
+    var width = _ref.width,
678 
+      height = _ref.height;
679 
+
680 
+    return width * height;
681 
+  }
682 
+
683 
+  /**
684 
+   * Utility used to transform the `auto` placement to the placement with more
685 
+   * available space.
686 
+   * @method
687 
+   * @memberof Popper.Utils
688 
+   * @argument {Object} data - The data object generated by update method
689 
+   * @argument {Object} options - Modifiers configuration and options
690 
+   * @returns {Object} The data object, properly modified
691 
+   */
692 
+  function computeAutoPlacement(placement, refRect, popper, reference, boundariesElement) {
693 
+    var padding = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : 0;
694 
+
695 
+    if (placement.indexOf('auto') === -1) {
696 
+      return placement;
697 
+    }
698 
+
699 
+    var boundaries = getBoundaries(popper, reference, padding, boundariesElement);
700 
+
701 
+    var rects = {
702 
+      top: {
703 
+        width: boundaries.width,
704 
+        height: refRect.top - boundaries.top
705 
+      },
706 
+      right: {
707 
+        width: boundaries.right - refRect.right,
708 
+        height: boundaries.height
709 
+      },
710 
+      bottom: {
711 
+        width: boundaries.width,
712 
+        height: boundaries.bottom - refRect.bottom
713 
+      },
714 
+      left: {
715 
+        width: refRect.left - boundaries.left,
716 
+        height: boundaries.height
717 
+      }
718 
+    };
719 
+
720 
+    var sortedAreas = Object.keys(rects).map(function (key) {
721 
+      return _extends({
722 
+        key: key
723 
+      }, rects[key], {
724 
+        area: getArea(rects[key])
725 
+      });
726 
+    }).sort(function (a, b) {
727 
+      return b.area - a.area;
728 
+    });
729 
+
730 
+    var filteredAreas = sortedAreas.filter(function (_ref2) {
731 
+      var width = _ref2.width,
732 
+        height = _ref2.height;
733 
+      return width >= popper.clientWidth && height >= popper.clientHeight;
734 
+    });
735 
+
736 
+    var computedPlacement = filteredAreas.length > 0 ? filteredAreas[0].key : sortedAreas[0].key;
737 
+
738 
+    var variation = placement.split('-')[1];
739 
+
740 
+    return computedPlacement + (variation ? '-' + variation : '');
741 
+  }
742 
+
743 
+  /**
744 
+   * Get offsets to the reference element
745 
+   * @method
746 
+   * @memberof Popper.Utils
747 
+   * @param {Object} state
748 
+   * @param {Element} popper - the popper element
749 
+   * @param {Element} reference - the reference element (the popper will be relative to this)
750 
+   * @param {Element} fixedPosition - is in fixed position mode
751 
+   * @returns {Object} An object containing the offsets which will be applied to the popper
752 
+   */
753 
+  function getReferenceOffsets(state, popper, reference) {
754 
+    var fixedPosition = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : null;
755 
+
756 
+    var commonOffsetParent = fixedPosition ? getFixedPositionOffsetParent(popper) : findCommonOffsetParent(popper, reference);
757 
+    return getOffsetRectRelativeToArbitraryNode(reference, commonOffsetParent, fixedPosition);
758 
+  }
759 
+
760 
+  /**
761 
+   * Get the outer sizes of the given element (offset size + margins)
762 
+   * @method
763 
+   * @memberof Popper.Utils
764 
+   * @argument {Element} element
765 
+   * @returns {Object} object containing width and height properties
766 
+   */
767 
+  function getOuterSizes(element) {
768 
+    var styles = getComputedStyle(element);
769 
+    var x = parseFloat(styles.marginTop) + parseFloat(styles.marginBottom);
770 
+    var y = parseFloat(styles.marginLeft) + parseFloat(styles.marginRight);
771 
+    var result = {
772 
+      width: element.offsetWidth + y,
773 
+      height: element.offsetHeight + x
774 
+    };
775 
+    return result;
776 
+  }
777 
+
778 
+  /**
779 
+   * Get the opposite placement of the given one
780 
+   * @method
781 
+   * @memberof Popper.Utils
782 
+   * @argument {String} placement
783 
+   * @returns {String} flipped placement
784 
+   */
785 
+  function getOppositePlacement(placement) {
786 
+    var hash = { left: 'right', right: 'left', bottom: 'top', top: 'bottom' };
787 
+    return placement.replace(/left|right|bottom|top/g, function (matched) {
788 
+      return hash[matched];
789 
+    });
790 
+  }
791 
+
792 
+  /**
793 
+   * Get offsets to the popper
794 
+   * @method
795 
+   * @memberof Popper.Utils
796 
+   * @param {Object} position - CSS position the Popper will get applied
797 
+   * @param {HTMLElement} popper - the popper element
798 
+   * @param {Object} referenceOffsets - the reference offsets (the popper will be relative to this)
799 
+   * @param {String} placement - one of the valid placement options
800 
+   * @returns {Object} popperOffsets - An object containing the offsets which will be applied to the popper
801 
+   */
802 
+  function getPopperOffsets(popper, referenceOffsets, placement) {
803 
+    placement = placement.split('-')[0];
804 
+
805 
+    // Get popper node sizes
806 
+    var popperRect = getOuterSizes(popper);
807 
+
808 
+    // Add position, width and height to our offsets object
809 
+    var popperOffsets = {
810 
+      width: popperRect.width,
811 
+      height: popperRect.height
812 
+    };
813 
+
814 
+    // depending by the popper placement we have to compute its offsets slightly differently
815 
+    var isHoriz = ['right', 'left'].indexOf(placement) !== -1;
816 
+    var mainSide = isHoriz ? 'top' : 'left';
817 
+    var secondarySide = isHoriz ? 'left' : 'top';
818 
+    var measurement = isHoriz ? 'height' : 'width';
819 
+    var secondaryMeasurement = !isHoriz ? 'height' : 'width';
820 
+
821 
+    popperOffsets[mainSide] = referenceOffsets[mainSide] + referenceOffsets[measurement] / 2 - popperRect[measurement] / 2;
822 
+    if (placement === secondarySide) {
823 
+      popperOffsets[secondarySide] = referenceOffsets[secondarySide] - popperRect[secondaryMeasurement];
824 
+    } else {
825 
+      popperOffsets[secondarySide] = referenceOffsets[getOppositePlacement(secondarySide)];
826 
+    }
827 
+
828 
+    return popperOffsets;
829 
+  }
830 
+
831 
+  /**
832 
+   * Mimics the `find` method of Array
833 
+   * @method
834 
+   * @memberof Popper.Utils
835 
+   * @argument {Array} arr
836 
+   * @argument prop
837 
+   * @argument value
838 
+   * @returns index or -1
839 
+   */
840 
+  function find(arr, check) {
841 
+    // use native find if supported
842 
+    if (Array.prototype.find) {
843 
+      return arr.find(check);
844 
+    }
845 
+
846 
+    // use `filter` to obtain the same behavior of `find`
847 
+    return arr.filter(check)[0];
848 
+  }
849 
+
850 
+  /**
851 
+   * Return the index of the matching object
852 
+   * @method
853 
+   * @memberof Popper.Utils
854 
+   * @argument {Array} arr
855 
+   * @argument prop
856 
+   * @argument value
857 
+   * @returns index or -1
858 
+   */
859 
+  function findIndex(arr, prop, value) {
860 
+    // use native findIndex if supported
861 
+    if (Array.prototype.findIndex) {
862 
+      return arr.findIndex(function (cur) {
863 
+        return cur[prop] === value;
864 
+      });
865 
+    }
866 
+
867 
+    // use `find` + `indexOf` if `findIndex` isn't supported
868 
+    var match = find(arr, function (obj) {
869 
+      return obj[prop] === value;
870 
+    });
871 
+    return arr.indexOf(match);
872 
+  }
873 
+
874 
+  /**
875 
+   * Loop trough the list of modifiers and run them in order,
876 
+   * each of them will then edit the data object.
877 
+   * @method
878 
+   * @memberof Popper.Utils
879 
+   * @param {dataObject} data
880 
+   * @param {Array} modifiers
881 
+   * @param {String} ends - Optional modifier name used as stopper
882 
+   * @returns {dataObject}
883 
+   */
884 
+  function runModifiers(modifiers, data, ends) {
885 
+    var modifiersToRun = ends === undefined ? modifiers : modifiers.slice(0, findIndex(modifiers, 'name', ends));
886 
+
887 
+    modifiersToRun.forEach(function (modifier) {
888 
+      if (modifier['function']) {
889 
+        // eslint-disable-line dot-notation
890 
+        console.warn('`modifier.function` is deprecated, use `modifier.fn`!');
891 
+      }
892 
+      var fn = modifier['function'] || modifier.fn; // eslint-disable-line dot-notation
893 
+      if (modifier.enabled && isFunction(fn)) {
894 
+        // Add properties to offsets to make them a complete clientRect object
895 
+        // we do this before each modifier to make sure the previous one doesn't
896 
+        // mess with these values
897 
+        data.offsets.popper = getClientRect(data.offsets.popper);
898 
+        data.offsets.reference = getClientRect(data.offsets.reference);
899 
+
900 
+        data = fn(data, modifier);
901 
+      }
902 
+    });
903 
+
904 
+    return data;
905 
+  }
906 
+
907 
+  /**
908 
+   * Updates the position of the popper, computing the new offsets and applying
909 
+   * the new style.<br />
910 
+   * Prefer `scheduleUpdate` over `update` because of performance reasons.
911 
+   * @method
912 
+   * @memberof Popper
913 
+   */
914 
+  function update() {
915 
+    // if popper is destroyed, don't perform any further update
916 
+    if (this.state.isDestroyed) {
917 
+      return;
918 
+    }
919 
+
920 
+    var data = {
921 
+      instance: this,
922 
+      styles: {},
923 
+      arrowStyles: {},
924 
+      attributes: {},
925 
+      flipped: false,
926 
+      offsets: {}
927 
+    };
928 
+
929 
+    // compute reference element offsets
930 
+    data.offsets.reference = getReferenceOffsets(this.state, this.popper, this.reference, this.options.positionFixed);
931 
+
932 
+    // compute auto placement, store placement inside the data object,
933 
+    // modifiers will be able to edit `placement` if needed
934 
+    // and refer to originalPlacement to know the original value
935 
+    data.placement = computeAutoPlacement(this.options.placement, data.offsets.reference, this.popper, this.reference, this.options.modifiers.flip.boundariesElement, this.options.modifiers.flip.padding);
936 
+
937 
+    // store the computed placement inside `originalPlacement`
938 
+    data.originalPlacement = data.placement;
939 
+
940 
+    data.positionFixed = this.options.positionFixed;
941 
+
942 
+    // compute the popper offsets
943 
+    data.offsets.popper = getPopperOffsets(this.popper, data.offsets.reference, data.placement);
944 
+    data.offsets.popper.position = this.options.positionFixed ? 'fixed' : 'absolute';
945 
+
946 
+    // run the modifiers
947 
+    data = runModifiers(this.modifiers, data);
948 
+
949 
+    // the first `update` will call `onCreate` callback
950 
+    // the other ones will call `onUpdate` callback
951 
+    if (!this.state.isCreated) {
952 
+      this.state.isCreated = true;
953 
+      this.options.onCreate(data);
954 
+    } else {
955 
+      this.options.onUpdate(data);
956 
+    }
957 
+  }
958 
+
959 
+  /**
960 
+   * Helper used to know if the given modifier is enabled.
961 
+   * @method
962 
+   * @memberof Popper.Utils
963 
+   * @returns {Boolean}
964 
+   */
965 
+  function isModifierEnabled(modifiers, modifierName) {
966 
+    return modifiers.some(function (_ref) {
967 
+      var name = _ref.name,
968 
+        enabled = _ref.enabled;
969 
+      return enabled && name === modifierName;
970 
+    });
971 
+  }
972 
+
973 
+  /**
974 
+   * Get the prefixed supported property name
975 
+   * @method
976 
+   * @memberof Popper.Utils
977 
+   * @argument {String} property (camelCase)
978 
+   * @returns {String} prefixed property (camelCase or PascalCase, depending on the vendor prefix)
979 
+   */
980 
+  function getSupportedPropertyName(property) {
981 
+    var prefixes = [false, 'ms', 'Webkit', 'Moz', 'O'];
982 
+    var upperProp = property.charAt(0).toUpperCase() + property.slice(1);
983 
+
984 
+    for (var i = 0; i < prefixes.length; i++) {
985 
+      var prefix = prefixes[i];
986 
+      var toCheck = prefix ? '' + prefix + upperProp : property;
987 
+      if (typeof document.body.style[toCheck] !== 'undefined') {
988 
+        return toCheck;
989 
+      }
990 
+    }
991 
+    return null;
992 
+  }
993 
+
994 
+  /**
995 
+   * Destroy the popper
996 
+   * @method
997 
+   * @memberof Popper
998 
+   */
999 
+  function destroy() {
1000 
+    this.state.isDestroyed = true;
1001 
+
1002 
+    // touch DOM only if `applyStyle` modifier is enabled
1003 
+    if (isModifierEnabled(this.modifiers, 'applyStyle')) {
1004 
+      this.popper.removeAttribute('x-placement');
1005 
+      this.popper.style.position = '';
1006 
+      this.popper.style.top = '';
1007 
+      this.popper.style.left = '';
1008 
+      this.popper.style.right = '';
1009 
+      this.popper.style.bottom = '';
1010 
+      this.popper.style.willChange = '';
1011 
+      this.popper.style[getSupportedPropertyName('transform')] = '';
1012 
+    }
1013 
+
1014 
+    this.disableEventListeners();
1015 
+
1016 
+    // remove the popper if user explicity asked for the deletion on destroy
1017 
+    // do not use `remove` because IE11 doesn't support it
1018 
+    if (this.options.removeOnDestroy) {
1019 
+      this.popper.parentNode.removeChild(this.popper);
1020 
+    }
1021 
+    return this;
1022 
+  }
1023 
+
1024 
+  /**
1025 
+   * Get the window associated with the element
1026 
+   * @argument {Element} element
1027 
+   * @returns {Window}
1028 
+   */
1029 
+  function getWindow(element) {
1030 
+    var ownerDocument = element.ownerDocument;
1031 
+    return ownerDocument ? ownerDocument.defaultView : window;
1032 
+  }
1033 
+
1034 
+  function attachToScrollParents(scrollParent, event, callback, scrollParents) {
1035 
+    var isBody = scrollParent.nodeName === 'BODY';
1036 
+    var target = isBody ? scrollParent.ownerDocument.defaultView : scrollParent;
1037 
+    target.addEventListener(event, callback, { passive: true });
1038 
+
1039 
+    if (!isBody) {
1040 
+      attachToScrollParents(getScrollParent(target.parentNode), event, callback, scrollParents);
1041 
+    }
1042 
+    scrollParents.push(target);
1043 
+  }
1044 
+
1045 
+  /**
1046 
+   * Setup needed event listeners used to update the popper position
1047 
+   * @method
1048 
+   * @memberof Popper.Utils
1049 
+   * @private
1050 
+   */
1051 
+  function setupEventListeners(reference, options, state, updateBound) {
1052 
+    // Resize event listener on window
1053 
+    state.updateBound = updateBound;
1054 
+    getWindow(reference).addEventListener('resize', state.updateBound, { passive: true });
1055 
+
1056 
+    // Scroll event listener on scroll parents
1057 
+    var scrollElement = getScrollParent(reference);
1058 
+    attachToScrollParents(scrollElement, 'scroll', state.updateBound, state.scrollParents);
1059 
+    state.scrollElement = scrollElement;
1060 
+    state.eventsEnabled = true;
1061 
+
1062 
+    return state;
1063 
+  }
1064 
+
1065 
+  /**
1066 
+   * It will add resize/scroll events and start recalculating
1067 
+   * position of the popper element when they are triggered.
1068 
+   * @method
1069 
+   * @memberof Popper
1070 
+   */
1071 
+  function enableEventListeners() {
1072 
+    if (!this.state.eventsEnabled) {
1073 
+      this.state = setupEventListeners(this.reference, this.options, this.state, this.scheduleUpdate);
1074 
+    }
1075 
+  }
1076 
+
1077 
+  /**
1078 
+   * Remove event listeners used to update the popper position
1079 
+   * @method
1080 
+   * @memberof Popper.Utils
1081 
+   * @private
1082 
+   */
1083 
+  function removeEventListeners(reference, state) {
1084 
+    // Remove resize event listener on window
1085 
+    getWindow(reference).removeEventListener('resize', state.updateBound);
1086 
+
1087 
+    // Remove scroll event listener on scroll parents
1088 
+    state.scrollParents.forEach(function (target) {
1089 
+      target.removeEventListener('scroll', state.updateBound);
1090 
+    });
1091 
+
1092 
+    // Reset state
1093 
+    state.updateBound = null;
1094 
+    state.scrollParents = [];
1095 
+    state.scrollElement = null;
1096 
+    state.eventsEnabled = false;
1097 
+    return state;
1098 
+  }
1099 
+
1100 
+  /**
1101 
+   * It will remove resize/scroll events and won't recalculate popper position
1102 
+   * when they are triggered. It also won't trigger onUpdate callback anymore,
1103 
+   * unless you call `update` method manually.
1104 
+   * @method
1105 
+   * @memberof Popper
1106 
+   */
1107 
+  function disableEventListeners() {
1108 
+    if (this.state.eventsEnabled) {
1109 
+      cancelAnimationFrame(this.scheduleUpdate);
1110 
+      this.state = removeEventListeners(this.reference, this.state);
1111 
+    }
1112 
+  }
1113 
+
1114 
+  /**
1115 
+   * Tells if a given input is a number
1116 
+   * @method
1117 
+   * @memberof Popper.Utils
1118 
+   * @param {*} input to check
1119 
+   * @return {Boolean}
1120 
+   */
1121 
+  function isNumeric(n) {
1122 
+    return n !== '' && !isNaN(parseFloat(n)) && isFinite(n);
1123 
+  }
1124 
+
1125 
+  /**
1126 
+   * Set the style to the given popper
1127 
+   * @method
1128 
+   * @memberof Popper.Utils
1129 
+   * @argument {Element} element - Element to apply the style to
1130 
+   * @argument {Object} styles
1131 
+   * Object with a list of properties and values which will be applied to the element
1132 
+   */
1133 
+  function setStyles(element, styles) {
1134 
+    Object.keys(styles).forEach(function (prop) {
1135 
+      var unit = '';
1136 
+      // add unit if the value is numeric and is one of the following
1137 
+      if (['width', 'height', 'top', 'right', 'bottom', 'left'].indexOf(prop) !== -1 && isNumeric(styles[prop])) {
1138 
+        unit = 'px';
1139 
+      }
1140 
+      element.style[prop] = styles[prop] + unit;
1141 
+    });
1142 
+  }
1143 
+
1144 
+  /**
1145 
+   * Set the attributes to the given popper
1146 
+   * @method
1147 
+   * @memberof Popper.Utils
1148 
+   * @argument {Element} element - Element to apply the attributes to
1149 
+   * @argument {Object} styles
1150 
+   * Object with a list of properties and values which will be applied to the element
1151 
+   */
1152 
+  function setAttributes(element, attributes) {
1153 
+    Object.keys(attributes).forEach(function (prop) {
1154 
+      var value = attributes[prop];
1155 
+      if (value !== false) {
1156 
+        element.setAttribute(prop, attributes[prop]);
1157 
+      } else {
1158 
+        element.removeAttribute(prop);
1159 
+      }
1160 
+    });
1161 
+  }
1162 
+
1163 
+  /**
1164 
+   * @function
1165 
+   * @memberof Modifiers
1166 
+   * @argument {Object} data - The data object generated by `update` method
1167 
+   * @argument {Object} data.styles - List of style properties - values to apply to popper element
1168 
+   * @argument {Object} data.attributes - List of attribute properties - values to apply to popper element
1169 
+   * @argument {Object} options - Modifiers configuration and options
1170 
+   * @returns {Object} The same data object
1171 
+   */
1172 
+  function applyStyle(data) {
1173 
+    // any property present in `data.styles` will be applied to the popper,
1174 
+    // in this way we can make the 3rd party modifiers add custom styles to it
1175 
+    // Be aware, modifiers could override the properties defined in the previous
1176 
+    // lines of this modifier!
1177 
+    setStyles(data.instance.popper, data.styles);
1178 
+
1179 
+    // any property present in `data.attributes` will be applied to the popper,
1180 
+    // they will be set as HTML attributes of the element
1181 
+    setAttributes(data.instance.popper, data.attributes);
1182 
+
1183 
+    // if arrowElement is defined and arrowStyles has some properties
1184 
+    if (data.arrowElement && Object.keys(data.arrowStyles).length) {
1185 
+      setStyles(data.arrowElement, data.arrowStyles);
1186 
+    }
1187 
+
1188 
+    return data;
1189 
+  }
1190 
+
1191 
+  /**
1192 
+   * Set the x-placement attribute before everything else because it could be used
1193 
+   * to add margins to the popper margins needs to be calculated to get the
1194 
+   * correct popper offsets.
1195 
+   * @method
1196 
+   * @memberof Popper.modifiers
1197 
+   * @param {HTMLElement} reference - The reference element used to position the popper
1198 
+   * @param {HTMLElement} popper - The HTML element used as popper
1199 
+   * @param {Object} options - Popper.js options
1200 
+   */
1201 
+  function applyStyleOnLoad(reference, popper, options, modifierOptions, state) {
1202 
+    // compute reference element offsets
1203 
+    var referenceOffsets = getReferenceOffsets(state, popper, reference, options.positionFixed);
1204 
+
1205 
+    // compute auto placement, store placement inside the data object,
1206 
+    // modifiers will be able to edit `placement` if needed
1207 
+    // and refer to originalPlacement to know the original value
1208 
+    var placement = computeAutoPlacement(options.placement, referenceOffsets, popper, reference, options.modifiers.flip.boundariesElement, options.modifiers.flip.padding);
1209 
+
1210 
+    popper.setAttribute('x-placement', placement);
1211 
+
1212 
+    // Apply `position` to popper before anything else because
1213 
+    // without the position applied we can't guarantee correct computations
1214 
+    setStyles(popper, { position: options.positionFixed ? 'fixed' : 'absolute' });
1215 
+
1216 
+    return options;
1217 
+  }
1218 
+
1219 
+  /**
1220 
+   * @function
1221 
+   * @memberof Modifiers
1222 
+   * @argument {Object} data - The data object generated by `update` method
1223 
+   * @argument {Object} options - Modifiers configuration and options
1224 
+   * @returns {Object} The data object, properly modified
1225 
+   */
1226 
+  function computeStyle(data, options) {
1227 
+    var x = options.x,
1228 
+      y = options.y;
1229 
+    var popper = data.offsets.popper;
1230 
+
1231 
+    // Remove this legacy support in Popper.js v2
1232 
+
1233 
+    var legacyGpuAccelerationOption = find(data.instance.modifiers, function (modifier) {
1234 
+      return modifier.name === 'applyStyle';
1235 
+    }).gpuAcceleration;
1236 
+    if (legacyGpuAccelerationOption !== undefined) {
1237 
+      console.warn('WARNING: `gpuAcceleration` option moved to `computeStyle` modifier and will not be supported in future versions of Popper.js!');
1238 
+    }
1239 
+    var gpuAcceleration = legacyGpuAccelerationOption !== undefined ? legacyGpuAccelerationOption : options.gpuAcceleration;
1240 
+
1241 
+    var offsetParent = getOffsetParent(data.instance.popper);
1242 
+    var offsetParentRect = getBoundingClientRect(offsetParent);
1243 
+
1244 
+    // Styles
1245 
+    var styles = {
1246 
+      position: popper.position
1247 
+    };
1248 
+
1249 
+    // floor sides to avoid blurry text
1250 
+    var offsets = {
1251 
+      left: Math.floor(popper.left),
1252 
+      top: Math.floor(popper.top),
1253 
+      bottom: Math.floor(popper.bottom),
1254 
+      right: Math.floor(popper.right)
1255 
+    };
1256 
+
1257 
+    var sideA = x === 'bottom' ? 'top' : 'bottom';
1258 
+    var sideB = y === 'right' ? 'left' : 'right';
1259 
+
1260 
+    // if gpuAcceleration is set to `true` and transform is supported,
1261 
+    //  we use `translate3d` to apply the position to the popper we
1262 
+    // automatically use the supported prefixed version if needed
1263 
+    var prefixedProperty = getSupportedPropertyName('transform');
1264 
+
1265 
+    // now, let's make a step back and look at this code closely (wtf?)
1266 
+    // If the content of the popper grows once it's been positioned, it
1267 
+    // may happen that the popper gets misplaced because of the new content
1268 
+    // overflowing its reference element
1269 
+    // To avoid this problem, we provide two options (x and y), which allow
1270 
+    // the consumer to define the offset origin.
1271 
+    // If we position a popper on top of a reference element, we can set
1272 
+    // `x` to `top` to make the popper grow towards its top instead of
1273 
+    // its bottom.
1274 
+    var left = void 0,
1275 
+      top = void 0;
1276 
+    if (sideA === 'bottom') {
1277 
+      top = -offsetParentRect.height + offsets.bottom;
1278 
+    } else {
1279 
+      top = offsets.top;
1280 
+    }
1281 
+    if (sideB === 'right') {
1282 
+      left = -offsetParentRect.width + offsets.right;
1283 
+    } else {
1284 
+      left = offsets.left;
1285 
+    }
1286 
+    if (gpuAcceleration && prefixedProperty) {
1287 
+      styles[prefixedProperty] = 'translate3d(' + left + 'px, ' + top + 'px, 0)';
1288 
+      styles[sideA] = 0;
1289 
+      styles[sideB] = 0;
1290 
+      styles.willChange = 'transform';
1291 
+    } else {
1292 
+      // othwerise, we use the standard `top`, `left`, `bottom` and `right` properties
1293 
+      var invertTop = sideA === 'bottom' ? -1 : 1;
1294 
+      var invertLeft = sideB === 'right' ? -1 : 1;
1295 
+      styles[sideA] = top * invertTop;
1296 
+      styles[sideB] = left * invertLeft;
1297 
+      styles.willChange = sideA + ', ' + sideB;
1298 
+    }
1299 
+
1300 
+    // Attributes
1301 
+    var attributes = {
1302 
+      'x-placement': data.placement
1303 
+    };
1304 
+
1305 
+    // Update `data` attributes, styles and arrowStyles
1306 
+    data.attributes = _extends({}, attributes, data.attributes);
1307 
+    data.styles = _extends({}, styles, data.styles);
1308 
+    data.arrowStyles = _extends({}, data.offsets.arrow, data.arrowStyles);
1309 
+
1310 
+    return data;
1311 
+  }
1312 
+
1313 
+  /**
1314 
+   * Helper used to know if the given modifier depends from another one.<br />
1315 
+   * It checks if the needed modifier is listed and enabled.
1316 
+   * @method
1317 
+   * @memberof Popper.Utils
1318 
+   * @param {Array} modifiers - list of modifiers
1319 
+   * @param {String} requestingName - name of requesting modifier
1320 
+   * @param {String} requestedName - name of requested modifier
1321 
+   * @returns {Boolean}
1322 
+   */
1323 
+  function isModifierRequired(modifiers, requestingName, requestedName) {
1324 
+    var requesting = find(modifiers, function (_ref) {
1325 
+      var name = _ref.name;
1326 
+      return name === requestingName;
1327 
+    });
1328 
+
1329 
+    var isRequired = !!requesting && modifiers.some(function (modifier) {
1330 
+      return modifier.name === requestedName && modifier.enabled && modifier.order < requesting.order;
1331 
+    });
1332 
+
1333 
+    if (!isRequired) {
1334 
+      var _requesting = '`' + requestingName + '`';
1335 
+      var requested = '`' + requestedName + '`';
1336 
+      console.warn(requested + ' modifier is required by ' + _requesting + ' modifier in order to work, be sure to include it before ' + _requesting + '!');
1337 
+    }
1338 
+    return isRequired;
1339 
+  }
1340 
+
1341 
+  /**
1342 
+   * @function
1343 
+   * @memberof Modifiers
1344 
+   * @argument {Object} data - The data object generated by update method
1345 
+   * @argument {Object} options - Modifiers configuration and options
1346 
+   * @returns {Object} The data object, properly modified
1347 
+   */
1348 
+  function arrow(data, options) {
1349 
+    var _data$offsets$arrow;
1350 
+
1351 
+    // arrow depends on keepTogether in order to work
1352 
+    if (!isModifierRequired(data.instance.modifiers, 'arrow', 'keepTogether')) {
1353 
+      return data;
1354 
+    }
1355 
+
1356 
+    var arrowElement = options.element;
1357 
+
1358 
+    // if arrowElement is a string, suppose it's a CSS selector
1359 
+    if (typeof arrowElement === 'string') {
1360 
+      arrowElement = data.instance.popper.querySelector(arrowElement);
1361 
+
1362 
+      // if arrowElement is not found, don't run the modifier
1363 
+      if (!arrowElement) {
1364 
+        return data;
1365 
+      }
1366 
+    } else {
1367 
+      // if the arrowElement isn't a query selector we must check that the
1368 
+      // provided DOM node is child of its popper node
1369 
+      if (!data.instance.popper.contains(arrowElement)) {
1370 
+        console.warn('WARNING: `arrow.element` must be child of its popper element!');
1371 
+        return data;
1372 
+      }
1373 
+    }
1374 
+
1375 
+    var placement = data.placement.split('-')[0];
1376 
+    var _data$offsets = data.offsets,
1377 
+      popper = _data$offsets.popper,
1378 
+      reference = _data$offsets.reference;
1379 
+
1380 
+    var isVertical = ['left', 'right'].indexOf(placement) !== -1;
1381 
+
1382 
+    var len = isVertical ? 'height' : 'width';
1383 
+    var sideCapitalized = isVertical ? 'Top' : 'Left';
1384 
+    var side = sideCapitalized.toLowerCase();
1385 
+    var altSide = isVertical ? 'left' : 'top';
1386 
+    var opSide = isVertical ? 'bottom' : 'right';
1387 
+    var arrowElementSize = getOuterSizes(arrowElement)[len];
1388 
+
1389 
+    //
1390 
+    // extends keepTogether behavior making sure the popper and its
1391 
+    // reference have enough pixels in conjuction
1392 
+    //
1393 
+
1394 
+    // top/left side
1395 
+    if (reference[opSide] - arrowElementSize < popper[side]) {
1396 
+      data.offsets.popper[side] -= popper[side] - (reference[opSide] - arrowElementSize);
1397 
+    }
1398 
+    // bottom/right side
1399 
+    if (reference[side] + arrowElementSize > popper[opSide]) {
1400 
+      data.offsets.popper[side] += reference[side] + arrowElementSize - popper[opSide];
1401 
+    }
1402 
+    data.offsets.popper = getClientRect(data.offsets.popper);
1403 
+
1404 
+    // compute center of the popper
1405 
+    var center = reference[side] + reference[len] / 2 - arrowElementSize / 2;
1406 
+
1407 
+    // Compute the sideValue using the updated popper offsets
1408 
+    // take popper margin in account because we don't have this info available
1409 
+    var css = getStyleComputedProperty(data.instance.popper);
1410 
+    var popperMarginSide = parseFloat(css['margin' + sideCapitalized], 10);
1411 
+    var popperBorderSide = parseFloat(css['border' + sideCapitalized + 'Width'], 10);
1412 
+    var sideValue = center - data.offsets.popper[side] - popperMarginSide - popperBorderSide;
1413 
+
1414 
+    // prevent arrowElement from being placed not contiguously to its popper
1415 
+    sideValue = Math.max(Math.min(popper[len] - arrowElementSize, sideValue), 0);
1416 
+
1417 
+    data.arrowElement = arrowElement;
1418 
+    data.offsets.arrow = (_data$offsets$arrow = {}, defineProperty(_data$offsets$arrow, side, Math.round(sideValue)), defineProperty(_data$offsets$arrow, altSide, ''), _data$offsets$arrow);
1419 
+
1420 
+    return data;
1421 
+  }
1422 
+
1423 
+  /**
1424 
+   * Get the opposite placement variation of the given one
1425 
+   * @method
1426 
+   * @memberof Popper.Utils
1427 
+   * @argument {String} placement variation
1428 
+   * @returns {String} flipped placement variation
1429 
+   */
1430 
+  function getOppositeVariation(variation) {
1431 
+    if (variation === 'end') {
1432 
+      return 'start';
1433 
+    } else if (variation === 'start') {
1434 
+      return 'end';
1435 
+    }
1436 
+    return variation;
1437 
+  }
1438 
+
1439 
+  /**
1440 
+   * List of accepted placements to use as values of the `placement` option.<br />
1441 
+   * Valid placements are:
1442 
+   * - `auto`
1443 
+   * - `top`
1444 
+   * - `right`
1445 
+   * - `bottom`
1446 
+   * - `left`
1447 
+   *
1448 
+   * Each placement can have a variation from this list:
1449 
+   * - `-start`
1450 
+   * - `-end`
1451 
+   *
1452 
+   * Variations are interpreted easily if you think of them as the left to right
1453 
+   * written languages. Horizontally (`top` and `bottom`), `start` is left and `end`
1454 
+   * is right.<br />
1455 
+   * Vertically (`left` and `right`), `start` is top and `end` is bottom.
1456 
+   *
1457 
+   * Some valid examples are:
1458 
+   * - `top-end` (on top of reference, right aligned)
1459 
+   * - `right-start` (on right of reference, top aligned)
1460 
+   * - `bottom` (on bottom, centered)
1461 
+   * - `auto-right` (on the side with more space available, alignment depends by placement)
1462 
+   *
1463 
+   * @static
1464 
+   * @type {Array}
1465 
+   * @enum {String}
1466 
+   * @readonly
1467 
+   * @method placements
1468 
+   * @memberof Popper
1469 
+   */
1470 
+  var placements = ['auto-start', 'auto', 'auto-end', 'top-start', 'top', 'top-end', 'right-start', 'right', 'right-end', 'bottom-end', 'bottom', 'bottom-start', 'left-end', 'left', 'left-start'];
1471 
+
1472 
+// Get rid of `auto` `auto-start` and `auto-end`
1473 
+  var validPlacements = placements.slice(3);
1474 
+
1475 
+  /**
1476 
+   * Given an initial placement, returns all the subsequent placements
1477 
+   * clockwise (or counter-clockwise).
1478 
+   *
1479 
+   * @method
1480 
+   * @memberof Popper.Utils
1481 
+   * @argument {String} placement - A valid placement (it accepts variations)
1482 
+   * @argument {Boolean} counter - Set to true to walk the placements counterclockwise
1483 
+   * @returns {Array} placements including their variations
1484 
+   */
1485 
+  function clockwise(placement) {
1486 
+    var counter = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
1487 
+
1488 
+    var index = validPlacements.indexOf(placement);
1489 
+    var arr = validPlacements.slice(index + 1).concat(validPlacements.slice(0, index));
1490 
+    return counter ? arr.reverse() : arr;
1491 
+  }
1492 
+
1493 
+  var BEHAVIORS = {
1494 
+    FLIP: 'flip',
1495 
+    CLOCKWISE: 'clockwise',
1496 
+    COUNTERCLOCKWISE: 'counterclockwise'
1497 
+  };
1498 
+
1499 
+  /**
1500 
+   * @function
1501 
+   * @memberof Modifiers
1502 
+   * @argument {Object} data - The data object generated by update method
1503 
+   * @argument {Object} options - Modifiers configuration and options
1504 
+   * @returns {Object} The data object, properly modified
1505 
+   */
1506 
+  function flip(data, options) {
1507 
+    // if `inner` modifier is enabled, we can't use the `flip` modifier
1508 
+    if (isModifierEnabled(data.instance.modifiers, 'inner')) {
1509 
+      return data;
1510 
+    }
1511 
+
1512 
+    if (data.flipped && data.placement === data.originalPlacement) {
1513 
+      // seems like flip is trying to loop, probably there's not enough space on any of the flippable sides
1514 
+      return data;
1515 
+    }
1516 
+
1517 
+    var boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, options.boundariesElement, data.positionFixed);
1518 
+
1519 
+    var placement = data.placement.split('-')[0];
1520 
+    var placementOpposite = getOppositePlacement(placement);
1521 
+    var variation = data.placement.split('-')[1] || '';
1522 
+
1523 
+    var flipOrder = [];
1524 
+
1525 
+    switch (options.behavior) {
1526 
+      case BEHAVIORS.FLIP:
1527 
+        flipOrder = [placement, placementOpposite];
1528 
+        break;
1529 
+      case BEHAVIORS.CLOCKWISE:
1530 
+        flipOrder = clockwise(placement);
1531 
+        break;
1532 
+      case BEHAVIORS.COUNTERCLOCKWISE:
1533 
+        flipOrder = clockwise(placement, true);
1534 
+        break;
1535 
+      default:
1536 
+        flipOrder = options.behavior;
1537 
+    }
1538 
+
1539 
+    flipOrder.forEach(function (step, index) {
1540 
+      if (placement !== step || flipOrder.length === index + 1) {
1541 
+        return data;
1542 
+      }
1543 
+
1544 
+      placement = data.placement.split('-')[0];
1545 
+      placementOpposite = getOppositePlacement(placement);
1546 
+
1547 
+      var popperOffsets = data.offsets.popper;
1548 
+      var refOffsets = data.offsets.reference;
1549 
+
1550 
+      // using floor because the reference offsets may contain decimals we are not going to consider here
1551 
+      var floor = Math.floor;
1552 
+      var overlapsRef = placement === 'left' && floor(popperOffsets.right) > floor(refOffsets.left) || placement === 'right' && floor(popperOffsets.left) < floor(refOffsets.right) || placement === 'top' && floor(popperOffsets.bottom) > floor(refOffsets.top) || placement === 'bottom' && floor(popperOffsets.top) < floor(refOffsets.bottom);
1553 
+
1554 
+      var overflowsLeft = floor(popperOffsets.left) < floor(boundaries.left);
1555 
+      var overflowsRight = floor(popperOffsets.right) > floor(boundaries.right);
1556 
+      var overflowsTop = floor(popperOffsets.top) < floor(boundaries.top);
1557 
+      var overflowsBottom = floor(popperOffsets.bottom) > floor(boundaries.bottom);
1558 
+
1559 
+      var overflowsBoundaries = placement === 'left' && overflowsLeft || placement === 'right' && overflowsRight || placement === 'top' && overflowsTop || placement === 'bottom' && overflowsBottom;
1560 
+
1561 
+      // flip the variation if required
1562 
+      var isVertical = ['top', 'bottom'].indexOf(placement) !== -1;
1563 
+      var flippedVariation = !!options.flipVariations && (isVertical && variation === 'start' && overflowsLeft || isVertical && variation === 'end' && overflowsRight || !isVertical && variation === 'start' && overflowsTop || !isVertical && variation === 'end' && overflowsBottom);
1564 
+
1565 
+      if (overlapsRef || overflowsBoundaries || flippedVariation) {
1566 
+        // this boolean to detect any flip loop
1567 
+        data.flipped = true;
1568 
+
1569 
+        if (overlapsRef || overflowsBoundaries) {
1570 
+          placement = flipOrder[index + 1];
1571 
+        }
1572 
+
1573 
+        if (flippedVariation) {
1574 
+          variation = getOppositeVariation(variation);
1575 
+        }
1576 
+
1577 
+        data.placement = placement + (variation ? '-' + variation : '');
1578 
+
1579 
+        // this object contains `position`, we want to preserve it along with
1580 
+        // any additional property we may add in the future
1581 
+        data.offsets.popper = _extends({}, data.offsets.popper, getPopperOffsets(data.instance.popper, data.offsets.reference, data.placement));
1582 
+
1583 
+        data = runModifiers(data.instance.modifiers, data, 'flip');
1584 
+      }
1585 
+    });
1586 
+    return data;
1587 
+  }
1588 
+
1589 
+  /**
1590 
+   * @function
1591 
+   * @memberof Modifiers
1592 
+   * @argument {Object} data - The data object generated by update method
1593 
+   * @argument {Object} options - Modifiers configuration and options
1594 
+   * @returns {Object} The data object, properly modified
1595 
+   */
1596 
+  function keepTogether(data) {
1597 
+    var _data$offsets = data.offsets,
1598 
+      popper = _data$offsets.popper,
1599 
+      reference = _data$offsets.reference;
1600 
+
1601 
+    var placement = data.placement.split('-')[0];
1602 
+    var floor = Math.floor;
1603 
+    var isVertical = ['top', 'bottom'].indexOf(placement) !== -1;
1604 
+    var side = isVertical ? 'right' : 'bottom';
1605 
+    var opSide = isVertical ? 'left' : 'top';
1606 
+    var measurement = isVertical ? 'width' : 'height';
1607 
+
1608 
+    if (popper[side] < floor(reference[opSide])) {
1609 
+      data.offsets.popper[opSide] = floor(reference[opSide]) - popper[measurement];
1610 
+    }
1611 
+    if (popper[opSide] > floor(reference[side])) {
1612 
+      data.offsets.popper[opSide] = floor(reference[side]);
1613 
+    }
1614 
+
1615 
+    return data;
1616 
+  }
1617 
+
1618 
+  /**
1619 
+   * Converts a string containing value + unit into a px value number
1620 
+   * @function
1621 
+   * @memberof {modifiers~offset}
1622 
+   * @private
1623 
+   * @argument {String} str - Value + unit string
1624 
+   * @argument {String} measurement - `height` or `width`
1625 
+   * @argument {Object} popperOffsets
1626 
+   * @argument {Object} referenceOffsets
1627 
+   * @returns {Number|String}
1628 
+   * Value in pixels, or original string if no values were extracted
1629 
+   */
1630 
+  function toValue(str, measurement, popperOffsets, referenceOffsets) {
1631 
+    // separate value from unit
1632 
+    var split = str.match(/((?:\-|\+)?\d*\.?\d*)(.*)/);
1633 
+    var value = +split[1];
1634 
+    var unit = split[2];
1635 
+
1636 
+    // If it's not a number it's an operator, I guess
1637 
+    if (!value) {
1638 
+      return str;
1639 
+    }
1640 
+
1641 
+    if (unit.indexOf('%') === 0) {
1642 
+      var element = void 0;
1643 
+      switch (unit) {
1644 
+        case '%p':
1645 
+          element = popperOffsets;
1646 
+          break;
1647 
+        case '%':
1648 
+        case '%r':
1649 
+        default:
1650 
+          element = referenceOffsets;
1651 
+      }
1652 
+
1653 
+      var rect = getClientRect(element);
1654 
+      return rect[measurement] / 100 * value;
1655 
+    } else if (unit === 'vh' || unit === 'vw') {
1656 
+      // if is a vh or vw, we calculate the size based on the viewport
1657 
+      var size = void 0;
1658 
+      if (unit === 'vh') {
1659 
+        size = Math.max(document.documentElement.clientHeight, window.innerHeight || 0);
1660 
+      } else {
1661 
+        size = Math.max(document.documentElement.clientWidth, window.innerWidth || 0);
1662 
+      }
1663 
+      return size / 100 * value;
1664 
+    } else {
1665 
+      // if is an explicit pixel unit, we get rid of the unit and keep the value
1666 
+      // if is an implicit unit, it's px, and we return just the value
1667 
+      return value;
1668 
+    }
1669 
+  }
1670 
+
1671 
+  /**
1672 
+   * Parse an `offset` string to extrapolate `x` and `y` numeric offsets.
1673 
+   * @function
1674 
+   * @memberof {modifiers~offset}
1675 
+   * @private
1676 
+   * @argument {String} offset
1677 
+   * @argument {Object} popperOffsets
1678 
+   * @argument {Object} referenceOffsets
1679 
+   * @argument {String} basePlacement
1680 
+   * @returns {Array} a two cells array with x and y offsets in numbers
1681 
+   */
1682 
+  function parseOffset(offset, popperOffsets, referenceOffsets, basePlacement) {
1683 
+    var offsets = [0, 0];
1684 
+
1685 
+    // Use height if placement is left or right and index is 0 otherwise use width
1686 
+    // in this way the first offset will use an axis and the second one
1687 
+    // will use the other one
1688 
+    var useHeight = ['right', 'left'].indexOf(basePlacement) !== -1;
1689 
+
1690 
+    // Split the offset string to obtain a list of values and operands
1691 
+    // The regex addresses values with the plus or minus sign in front (+10, -20, etc)
1692 
+    var fragments = offset.split(/(\+|\-)/).map(function (frag) {
1693 
+      return frag.trim();
1694 
+    });
1695 
+
1696 
+    // Detect if the offset string contains a pair of values or a single one
1697 
+    // they could be separated by comma or space
1698 
+    var divider = fragments.indexOf(find(fragments, function (frag) {
1699 
+      return frag.search(/,|\s/) !== -1;
1700 
+    }));
1701 
+
1702 
+    if (fragments[divider] && fragments[divider].indexOf(',') === -1) {
1703 
+      console.warn('Offsets separated by white space(s) are deprecated, use a comma (,) instead.');
1704 
+    }
1705 
+
1706 
+    // If divider is found, we divide the list of values and operands to divide
1707 
+    // them by ofset X and Y.
1708 
+    var splitRegex = /\s*,\s*|\s+/;
1709 
+    var ops = divider !== -1 ? [fragments.slice(0, divider).concat([fragments[divider].split(splitRegex)[0]]), [fragments[divider].split(splitRegex)[1]].concat(fragments.slice(divider + 1))] : [fragments];
1710 
+
1711 
+    // Convert the values with units to absolute pixels to allow our computations
1712 
+    ops = ops.map(function (op, index) {
1713 
+      // Most of the units rely on the orientation of the popper
1714 
+      var measurement = (index === 1 ? !useHeight : useHeight) ? 'height' : 'width';
1715 
+      var mergeWithPrevious = false;
1716 
+      return op
1717 
+      // This aggregates any `+` or `-` sign that aren't considered operators
1718 
+      // e.g.: 10 + +5 => [10, +, +5]
1719 
+        .reduce(function (a, b) {
1720 
+          if (a[a.length - 1] === '' && ['+', '-'].indexOf(b) !== -1) {
1721 
+            a[a.length - 1] = b;
1722 
+            mergeWithPrevious = true;
1723 
+            return a;
1724 
+          } else if (mergeWithPrevious) {
1725 
+            a[a.length - 1] += b;
1726 
+            mergeWithPrevious = false;
1727 
+            return a;
1728 
+          } else {
1729 
+            return a.concat(b);
1730 
+          }
1731 
+        }, [])
1732 
+        // Here we convert the string values into number values (in px)
1733 
+        .map(function (str) {
1734 
+          return toValue(str, measurement, popperOffsets, referenceOffsets);
1735 
+        });
1736 
+    });
1737 
+
1738 
+    // Loop trough the offsets arrays and execute the operations
1739 
+    ops.forEach(function (op, index) {
1740 
+      op.forEach(function (frag, index2) {
1741 
+        if (isNumeric(frag)) {
1742 
+          offsets[index] += frag * (op[index2 - 1] === '-' ? -1 : 1);
1743 
+        }
1744 
+      });
1745 
+    });
1746 
+    return offsets;
1747 
+  }
1748 
+
1749 
+  /**
1750 
+   * @function
1751 
+   * @memberof Modifiers
1752 
+   * @argument {Object} data - The data object generated by update method
1753 
+   * @argument {Object} options - Modifiers configuration and options
1754 
+   * @argument {Number|String} options.offset=0
1755 
+   * The offset value as described in the modifier description
1756 
+   * @returns {Object} The data object, properly modified
1757 
+   */
1758 
+  function offset(data, _ref) {
1759 
+    var offset = _ref.offset;
1760 
+    var placement = data.placement,
1761 
+      _data$offsets = data.offsets,
1762 
+      popper = _data$offsets.popper,
1763 
+      reference = _data$offsets.reference;
1764 
+
1765 
+    var basePlacement = placement.split('-')[0];
1766 
+
1767 
+    var offsets = void 0;
1768 
+    if (isNumeric(+offset)) {
1769 
+      offsets = [+offset, 0];
1770 
+    } else {
1771 
+      offsets = parseOffset(offset, popper, reference, basePlacement);
1772 
+    }
1773 
+
1774 
+    if (basePlacement === 'left') {
1775 
+      popper.top += offsets[0];
1776 
+      popper.left -= offsets[1];
1777 
+    } else if (basePlacement === 'right') {
1778 
+      popper.top += offsets[0];
1779 
+      popper.left += offsets[1];
1780 
+    } else if (basePlacement === 'top') {
1781 
+      popper.left += offsets[0];
1782 
+      popper.top -= offsets[1];
1783 
+    } else if (basePlacement === 'bottom') {
1784 
+      popper.left += offsets[0];
1785 
+      popper.top += offsets[1];
1786 
+    }
1787 
+
1788 
+    data.popper = popper;
1789 
+    return data;
1790 
+  }
1791 
+
1792 
+  /**
1793 
+   * @function
1794 
+   * @memberof Modifiers
1795 
+   * @argument {Object} data - The data object generated by `update` method
1796 
+   * @argument {Object} options - Modifiers configuration and options
1797 
+   * @returns {Object} The data object, properly modified
1798 
+   */
1799 
+  function preventOverflow(data, options) {
1800 
+    var boundariesElement = options.boundariesElement || getOffsetParent(data.instance.popper);
1801 
+
1802 
+    // If offsetParent is the reference element, we really want to
1803 
+    // go one step up and use the next offsetParent as reference to
1804 
+    // avoid to make this modifier completely useless and look like broken
1805 
+    if (data.instance.reference === boundariesElement) {
1806 
+      boundariesElement = getOffsetParent(boundariesElement);
1807 
+    }
1808 
+
1809 
+    var boundaries = getBoundaries(data.instance.popper, data.instance.reference, options.padding, boundariesElement, data.positionFixed);
1810 
+    options.boundaries = boundaries;
1811 
+
1812 
+    var order = options.priority;
1813 
+    var popper = data.offsets.popper;
1814 
+
1815 
+    var check = {
1816 
+      primary: function primary(placement) {
1817 
+        var value = popper[placement];
1818 
+        if (popper[placement] < boundaries[placement] && !options.escapeWithReference) {
1819 
+          value = Math.max(popper[placement], boundaries[placement]);
1820 
+        }
1821 
+        return defineProperty({}, placement, value);
1822 
+      },
1823 
+      secondary: function secondary(placement) {
1824 
+        var mainSide = placement === 'right' ? 'left' : 'top';
1825 
+        var value = popper[mainSide];
1826 
+        if (popper[placement] > boundaries[placement] && !options.escapeWithReference) {
1827 
+          value = Math.min(popper[mainSide], boundaries[placement] - (placement === 'right' ? popper.width : popper.height));
1828 
+        }
1829 
+        return defineProperty({}, mainSide, value);
1830 
+      }
1831 
+    };
1832 
+
1833 
+    order.forEach(function (placement) {
1834 
+      var side = ['left', 'top'].indexOf(placement) !== -1 ? 'primary' : 'secondary';
1835 
+      popper = _extends({}, popper, check[side](placement));
1836 
+    });
1837 
+
1838 
+    data.offsets.popper = popper;
1839 
+
1840 
+    return data;
1841 
+  }
1842 
+
1843 
+  /**
1844 
+   * @function
1845 
+   * @memberof Modifiers
1846 
+   * @argument {Object} data - The data object generated by `update` method
1847 
+   * @argument {Object} options - Modifiers configuration and options
1848 
+   * @returns {Object} The data object, properly modified
1849 
+   */
1850 
+  function shift(data) {
1851 
+    var placement = data.placement;
1852 
+    var basePlacement = placement.split('-')[0];
1853 
+    var shiftvariation = placement.split('-')[1];
1854 
+
1855 
+    // if shift shiftvariation is specified, run the modifier
1856 
+    if (shiftvariation) {
1857 
+      var _data$offsets = data.offsets,
1858 
+        reference = _data$offsets.reference,
1859 
+        popper = _data$offsets.popper;
1860 
+
1861 
+      var isVertical = ['bottom', 'top'].indexOf(basePlacement) !== -1;
1862 
+      var side = isVertical ? 'left' : 'top';
1863 
+      var measurement = isVertical ? 'width' : 'height';
1864 
+
1865 
+      var shiftOffsets = {
1866 
+        start: defineProperty({}, side, reference[side]),
1867 
+        end: defineProperty({}, side, reference[side] + reference[measurement] - popper[measurement])
1868 
+      };
1869 
+
1870 
+      data.offsets.popper = _extends({}, popper, shiftOffsets[shiftvariation]);
1871 
+    }
1872 
+
1873 
+    return data;
1874 
+  }
1875 
+
1876 
+  /**
1877 
+   * @function
1878 
+   * @memberof Modifiers
1879 
+   * @argument {Object} data - The data object generated by update method
1880 
+   * @argument {Object} options - Modifiers configuration and options
1881 
+   * @returns {Object} The data object, properly modified
1882 
+   */
1883 
+  function hide(data) {
1884 
+    if (!isModifierRequired(data.instance.modifiers, 'hide', 'preventOverflow')) {
1885 
+      return data;
1886 
+    }
1887 
+
1888 
+    var refRect = data.offsets.reference;
1889 
+    var bound = find(data.instance.modifiers, function (modifier) {
1890 
+      return modifier.name === 'preventOverflow';
1891 
+    }).boundaries;
1892 
+
1893 
+    if (refRect.bottom < bound.top || refRect.left > bound.right || refRect.top > bound.bottom || refRect.right < bound.left) {
1894 
+      // Avoid unnecessary DOM access if visibility hasn't changed
1895 
+      if (data.hide === true) {
1896 
+        return data;
1897 
+      }
1898 
+
1899 
+      data.hide = true;
1900 
+      data.attributes['x-out-of-boundaries'] = '';
1901 
+    } else {
1902 
+      // Avoid unnecessary DOM access if visibility hasn't changed
1903 
+      if (data.hide === false) {
1904 
+        return data;
1905 
+      }
1906 
+
1907 
+      data.hide = false;
1908 
+      data.attributes['x-out-of-boundaries'] = false;
1909 
+    }
1910 
+
1911 
+    return data;
1912 
+  }
1913 
+
1914 
+  /**
1915 
+   * @function
1916 
+   * @memberof Modifiers
1917 
+   * @argument {Object} data - The data object generated by `update` method
1918 
+   * @argument {Object} options - Modifiers configuration and options
1919 
+   * @returns {Object} The data object, properly modified
1920 
+   */
1921 
+  function inner(data) {
1922 
+    var placement = data.placement;
1923 
+    var basePlacement = placement.split('-')[0];
1924 
+    var _data$offsets = data.offsets,
1925 
+      popper = _data$offsets.popper,
1926 
+      reference = _data$offsets.reference;
1927 
+
1928 
+    var isHoriz = ['left', 'right'].indexOf(basePlacement) !== -1;
1929 
+
1930 
+    var subtractLength = ['top', 'left'].indexOf(basePlacement) === -1;
1931 
+
1932 
+    popper[isHoriz ? 'left' : 'top'] = reference[basePlacement] - (subtractLength ? popper[isHoriz ? 'width' : 'height'] : 0);
1933 
+
1934 
+    data.placement = getOppositePlacement(placement);
1935 
+    data.offsets.popper = getClientRect(popper);
1936 
+
1937 
+    return data;
1938 
+  }
1939 
+
1940 
+  /**
1941 
+   * Modifier function, each modifier can have a function of this type assigned
1942 
+   * to its `fn` property.<br />
1943 
+   * These functions will be called on each update, this means that you must
1944 
+   * make sure they are performant enough to avoid performance bottlenecks.
1945 
+   *
1946 
+   * @function ModifierFn
1947 
+   * @argument {dataObject} data - The data object generated by `update` method
1948 
+   * @argument {Object} options - Modifiers configuration and options
1949 
+   * @returns {dataObject} The data object, properly modified
1950 
+   */
1951 
+
1952 
+  /**
1953 
+   * Modifiers are plugins used to alter the behavior of your poppers.<br />
1954 
+   * Popper.js uses a set of 9 modifiers to provide all the basic functionalities
1955 
+   * needed by the library.
1956 
+   *
1957 
+   * Usually you don't want to override the `order`, `fn` and `onLoad` props.
1958 
+   * All the other properties are configurations that could be tweaked.
1959 
+   * @namespace modifiers
1960 
+   */
1961 
+  var modifiers = {
1962 
+    /**
1963 
+     * Modifier used to shift the popper on the start or end of its reference
1964 
+     * element.<br />
1965 
+     * It will read the variation of the `placement` property.<br />
1966 
+     * It can be one either `-end` or `-start`.
1967 
+     * @memberof modifiers
1968 
+     * @inner
1969 
+     */
1970 
+    shift: {
1971 
+      /** @prop {number} order=100 - Index used to define the order of execution */
1972 
+      order: 100,
1973 
+      /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
1974 
+      enabled: true,
1975 
+      /** @prop {ModifierFn} */
1976 
+      fn: shift
1977 
+    },
1978 
+
1979 
+    /**
1980 
+     * The `offset` modifier can shift your popper on both its axis.
1981 
+     *
1982 
+     * It accepts the following units:
1983 
+     * - `px` or unitless, interpreted as pixels
1984 
+     * - `%` or `%r`, percentage relative to the length of the reference element
1985 
+     * - `%p`, percentage relative to the length of the popper element
1986 
+     * - `vw`, CSS viewport width unit
1987 
+     * - `vh`, CSS viewport height unit
1988 
+     *
1989 
+     * For length is intended the main axis relative to the placement of the popper.<br />
1990 
+     * This means that if the placement is `top` or `bottom`, the length will be the
1991 
+     * `width`. In case of `left` or `right`, it will be the height.
1992 
+     *
1993 
+     * You can provide a single value (as `Number` or `String`), or a pair of values
1994 
+     * as `String` divided by a comma or one (or more) white spaces.<br />
1995 
+     * The latter is a deprecated method because it leads to confusion and will be
1996 
+     * removed in v2.<br />
1997 
+     * Additionally, it accepts additions and subtractions between different units.
1998 
+     * Note that multiplications and divisions aren't supported.
1999 
+     *
2000 
+     * Valid examples are:
2001 
+     * ```
2002 
+     * 10
2003 
+     * '10%'
2004 
+     * '10, 10'
2005 
+     * '10%, 10'
2006 
+     * '10 + 10%'
2007 
+     * '10 - 5vh + 3%'
2008 
+     * '-10px + 5vh, 5px - 6%'
2009 
+     * ```
2010 
+     * > **NB**: If you desire to apply offsets to your poppers in a way that may make them overlap
2011 
+     * > with their reference element, unfortunately, you will have to disable the `flip` modifier.
2012 
+     * > More on this [reading this issue](https://github.com/FezVrasta/popper.js/issues/373)
2013 
+     *
2014 
+     * @memberof modifiers
2015 
+     * @inner
2016 
+     */
2017 
+    offset: {
2018 
+      /** @prop {number} order=200 - Index used to define the order of execution */
2019 
+      order: 200,
2020 
+      /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2021 
+      enabled: true,
2022 
+      /** @prop {ModifierFn} */
2023 
+      fn: offset,
2024 
+      /** @prop {Number|String} offset=0
2025 
+       * The offset value as described in the modifier description
2026 
+       */
2027 
+      offset: 0
2028 
+    },
2029 
+
2030 
+    /**
2031 
+     * Modifier used to prevent the popper from being positioned outside the boundary.
2032 
+     *
2033 
+     * An scenario exists where the reference itself is not within the boundaries.<br />
2034 
+     * We can say it has "escaped the boundaries" — or just "escaped".<br />
2035 
+     * In this case we need to decide whether the popper should either:
2036 
+     *
2037 
+     * - detach from the reference and remain "trapped" in the boundaries, or
2038 
+     * - if it should ignore the boundary and "escape with its reference"
2039 
+     *
2040 
+     * When `escapeWithReference` is set to`true` and reference is completely
2041 
+     * outside its boundaries, the popper will overflow (or completely leave)
2042 
+     * the boundaries in order to remain attached to the edge of the reference.
2043 
+     *
2044 
+     * @memberof modifiers
2045 
+     * @inner
2046 
+     */
2047 
+    preventOverflow: {
2048 
+      /** @prop {number} order=300 - Index used to define the order of execution */
2049 
+      order: 300,
2050 
+      /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2051 
+      enabled: true,
2052 
+      /** @prop {ModifierFn} */
2053 
+      fn: preventOverflow,
2054 
+      /**
2055 
+       * @prop {Array} [priority=['left','right','top','bottom']]
2056 
+       * Popper will try to prevent overflow following these priorities by default,
2057 
+       * then, it could overflow on the left and on top of the `boundariesElement`
2058 
+       */
2059 
+      priority: ['left', 'right', 'top', 'bottom'],
2060 
+      /**
2061 
+       * @prop {number} padding=5
2062 
+       * Amount of pixel used to define a minimum distance between the boundaries
2063 
+       * and the popper this makes sure the popper has always a little padding
2064 
+       * between the edges of its container
2065 
+       */
2066 
+      padding: 5,
2067 
+      /**
2068 
+       * @prop {String|HTMLElement} boundariesElement='scrollParent'
2069 
+       * Boundaries used by the modifier, can be `scrollParent`, `window`,
2070 
+       * `viewport` or any DOM element.
2071 
+       */
2072 
+      boundariesElement: 'scrollParent'
2073 
+    },
2074 
+
2075 
+    /**
2076 
+     * Modifier used to make sure the reference and its popper stay near eachothers
2077 
+     * without leaving any gap between the two. Expecially useful when the arrow is
2078 
+     * enabled and you want to assure it to point to its reference element.
2079 
+     * It cares only about the first axis, you can still have poppers with margin
2080 
+     * between the popper and its reference element.
2081 
+     * @memberof modifiers
2082 
+     * @inner
2083 
+     */
2084 
+    keepTogether: {
2085 
+      /** @prop {number} order=400 - Index used to define the order of execution */
2086 
+      order: 400,
2087 
+      /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2088 
+      enabled: true,
2089 
+      /** @prop {ModifierFn} */
2090 
+      fn: keepTogether
2091 
+    },
2092 
+
2093 
+    /**
2094 
+     * This modifier is used to move the `arrowElement` of the popper to make
2095 
+     * sure it is positioned between the reference element and its popper element.
2096 
+     * It will read the outer size of the `arrowElement` node to detect how many
2097 
+     * pixels of conjuction are needed.
2098 
+     *
2099 
+     * It has no effect if no `arrowElement` is provided.
2100 
+     * @memberof modifiers
2101 
+     * @inner
2102 
+     */
2103 
+    arrow: {
2104 
+      /** @prop {number} order=500 - Index used to define the order of execution */
2105 
+      order: 500,
2106 
+      /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2107 
+      enabled: true,
2108 
+      /** @prop {ModifierFn} */
2109 
+      fn: arrow,
2110 
+      /** @prop {String|HTMLElement} element='[x-arrow]' - Selector or node used as arrow */
2111 
+      element: '[x-arrow]'
2112 
+    },
2113 
+
2114 
+    /**
2115 
+     * Modifier used to flip the popper's placement when it starts to overlap its
2116 
+     * reference element.
2117 
+     *
2118 
+     * Requires the `preventOverflow` modifier before it in order to work.
2119 
+     *
2120 
+     * **NOTE:** this modifier will interrupt the current update cycle and will
2121 
+     * restart it if it detects the need to flip the placement.
2122 
+     * @memberof modifiers
2123 
+     * @inner
2124 
+     */
2125 
+    flip: {
2126 
+      /** @prop {number} order=600 - Index used to define the order of execution */
2127 
+      order: 600,
2128 
+      /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2129 
+      enabled: true,
2130 
+      /** @prop {ModifierFn} */
2131 
+      fn: flip,
2132 
+      /**
2133 
+       * @prop {String|Array} behavior='flip'
2134 
+       * The behavior used to change the popper's placement. It can be one of
2135 
+       * `flip`, `clockwise`, `counterclockwise` or an array with a list of valid
2136 
+       * placements (with optional variations).
2137 
+       */
2138 
+      behavior: 'flip',
2139 
+      /**
2140 
+       * @prop {number} padding=5
2141 
+       * The popper will flip if it hits the edges of the `boundariesElement`
2142 
+       */
2143 
+      padding: 5,
2144 
+      /**
2145 
+       * @prop {String|HTMLElement} boundariesElement='viewport'
2146 
+       * The element which will define the boundaries of the popper position,
2147 
+       * the popper will never be placed outside of the defined boundaries
2148 
+       * (except if keepTogether is enabled)
2149 
+       */
2150 
+      boundariesElement: 'viewport'
2151 
+    },
2152 
+
2153 
+    /**
2154 
+     * Modifier used to make the popper flow toward the inner of the reference element.
2155 
+     * By default, when this modifier is disabled, the popper will be placed outside
2156 
+     * the reference element.
2157 
+     * @memberof modifiers
2158 
+     * @inner
2159 
+     */
2160 
+    inner: {
2161 
+      /** @prop {number} order=700 - Index used to define the order of execution */
2162 
+      order: 700,
2163 
+      /** @prop {Boolean} enabled=false - Whether the modifier is enabled or not */
2164 
+      enabled: false,
2165 
+      /** @prop {ModifierFn} */
2166 
+      fn: inner
2167 
+    },
2168 
+
2169 
+    /**
2170 
+     * Modifier used to hide the popper when its reference element is outside of the
2171 
+     * popper boundaries. It will set a `x-out-of-boundaries` attribute which can
2172 
+     * be used to hide with a CSS selector the popper when its reference is
2173 
+     * out of boundaries.
2174 
+     *
2175 
+     * Requires the `preventOverflow` modifier before it in order to work.
2176 
+     * @memberof modifiers
2177 
+     * @inner
2178 
+     */
2179 
+    hide: {
2180 
+      /** @prop {number} order=800 - Index used to define the order of execution */
2181 
+      order: 800,
2182 
+      /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2183 
+      enabled: true,
2184 
+      /** @prop {ModifierFn} */
2185 
+      fn: hide
2186 
+    },
2187 
+
2188 
+    /**
2189 
+     * Computes the style that will be applied to the popper element to gets
2190 
+     * properly positioned.
2191 
+     *
2192 
+     * Note that this modifier will not touch the DOM, it just prepares the styles
2193 
+     * so that `applyStyle` modifier can apply it. This separation is useful
2194 
+     * in case you need to replace `applyStyle` with a custom implementation.
2195 
+     *
2196 
+     * This modifier has `850` as `order` value to maintain backward compatibility
2197 
+     * with previous versions of Popper.js. Expect the modifiers ordering method
2198 
+     * to change in future major versions of the library.
2199 
+     *
2200 
+     * @memberof modifiers
2201 
+     * @inner
2202 
+     */
2203 
+    computeStyle: {
2204 
+      /** @prop {number} order=850 - Index used to define the order of execution */
2205 
+      order: 850,
2206 
+      /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2207 
+      enabled: true,
2208 
+      /** @prop {ModifierFn} */
2209 
+      fn: computeStyle,
2210 
+      /**
2211 
+       * @prop {Boolean} gpuAcceleration=true
2212 
+       * If true, it uses the CSS 3d transformation to position the popper.
2213 
+       * Otherwise, it will use the `top` and `left` properties.
2214 
+       */
2215 
+      gpuAcceleration: true,
2216 
+      /**
2217 
+       * @prop {string} [x='bottom']
2218 
+       * Where to anchor the X axis (`bottom` or `top`). AKA X offset origin.
2219 
+       * Change this if your popper should grow in a direction different from `bottom`
2220 
+       */
2221 
+      x: 'bottom',
2222 
+      /**
2223 
+       * @prop {string} [x='left']
2224 
+       * Where to anchor the Y axis (`left` or `right`). AKA Y offset origin.
2225 
+       * Change this if your popper should grow in a direction different from `right`
2226 
+       */
2227 
+      y: 'right'
2228 
+    },
2229 
+
2230 
+    /**
2231 
+     * Applies the computed styles to the popper element.
2232 
+     *
2233 
+     * All the DOM manipulations are limited to this modifier. This is useful in case
2234 
+     * you want to integrate Popper.js inside a framework or view library and you
2235 
+     * want to delegate all the DOM manipulations to it.
2236 
+     *
2237 
+     * Note that if you disable this modifier, you must make sure the popper element
2238 
+     * has its position set to `absolute` before Popper.js can do its work!
2239 
+     *
2240 
+     * Just disable this modifier and define you own to achieve the desired effect.
2241 
+     *
2242 
+     * @memberof modifiers
2243 
+     * @inner
2244 
+     */
2245 
+    applyStyle: {
2246 
+      /** @prop {number} order=900 - Index used to define the order of execution */
2247 
+      order: 900,
2248 
+      /** @prop {Boolean} enabled=true - Whether the modifier is enabled or not */
2249 
+      enabled: true,
2250 
+      /** @prop {ModifierFn} */
2251 
+      fn: applyStyle,
2252 
+      /** @prop {Function} */
2253 
+      onLoad: applyStyleOnLoad,
2254 
+      /**
2255 
+       * @deprecated since version 1.10.0, the property moved to `computeStyle` modifier
2256 
+       * @prop {Boolean} gpuAcceleration=true
2257 
+       * If true, it uses the CSS 3d transformation to position the popper.
2258 
+       * Otherwise, it will use the `top` and `left` properties.
2259 
+       */
2260 
+      gpuAcceleration: undefined
2261 
+    }
2262 
+  };
2263 
+
2264 
+  /**
2265 
+   * The `dataObject` is an object containing all the informations used by Popper.js
2266 
+   * this object get passed to modifiers and to the `onCreate` and `onUpdate` callbacks.
2267 
+   * @name dataObject
2268 
+   * @property {Object} data.instance The Popper.js instance
2269 
+   * @property {String} data.placement Placement applied to popper
2270 
+   * @property {String} data.originalPlacement Placement originally defined on init
2271 
+   * @property {Boolean} data.flipped True if popper has been flipped by flip modifier
2272 
+   * @property {Boolean} data.hide True if the reference element is out of boundaries, useful to know when to hide the popper.
2273 
+   * @property {HTMLElement} data.arrowElement Node used as arrow by arrow modifier
2274 
+   * @property {Object} data.styles Any CSS property defined here will be applied to the popper, it expects the JavaScript nomenclature (eg. `marginBottom`)
2275 
+   * @property {Object} data.arrowStyles Any CSS property defined here will be applied to the popper arrow, it expects the JavaScript nomenclature (eg. `marginBottom`)
2276 
+   * @property {Object} data.boundaries Offsets of the popper boundaries
2277 
+   * @property {Object} data.offsets The measurements of popper, reference and arrow elements.
2278 
+   * @property {Object} data.offsets.popper `top`, `left`, `width`, `height` values
2279 
+   * @property {Object} data.offsets.reference `top`, `left`, `width`, `height` values
2280 
+   * @property {Object} data.offsets.arrow] `top` and `left` offsets, only one of them will be different from 0
2281 
+   */
2282 
+
2283 
+  /**
2284 
+   * Default options provided to Popper.js constructor.<br />
2285 
+   * These can be overriden using the `options` argument of Popper.js.<br />
2286 
+   * To override an option, simply pass as 3rd argument an object with the same
2287 
+   * structure of this object, example:
2288 
+   * ```
2289 
+   * new Popper(ref, pop, {
2290 
+ *   modifiers: {
2291 
+ *     preventOverflow: { enabled: false }
2292 
+ *   }
2293 
+ * })
2294 
+   * ```
2295 
+   * @type {Object}
2296 
+   * @static
2297 
+   * @memberof Popper
2298 
+   */
2299 
+  var Defaults = {
2300 
+    /**
2301 
+     * Popper's placement
2302 
+     * @prop {Popper.placements} placement='bottom'
2303 
+     */
2304 
+    placement: 'bottom',
2305 
+
2306 
+    /**
2307 
+     * Set this to true if you want popper to position it self in 'fixed' mode
2308 
+     * @prop {Boolean} positionFixed=false
2309 
+     */
2310 
+    positionFixed: false,
2311 
+
2312 
+    /**
2313 
+     * Whether events (resize, scroll) are initially enabled
2314 
+     * @prop {Boolean} eventsEnabled=true
2315 
+     */
2316 
+    eventsEnabled: true,
2317 
+
2318 
+    /**
2319 
+     * Set to true if you want to automatically remove the popper when
2320 
+     * you call the `destroy` method.
2321 
+     * @prop {Boolean} removeOnDestroy=false
2322 
+     */
2323 
+    removeOnDestroy: false,
2324 
+
2325 
+    /**
2326 
+     * Callback called when the popper is created.<br />
2327 
+     * By default, is set to no-op.<br />
2328 
+     * Access Popper.js instance with `data.instance`.
2329 
+     * @prop {onCreate}
2330 
+     */
2331 
+    onCreate: function onCreate() {},
2332 
+
2333 
+    /**
2334 
+     * Callback called when the popper is updated, this callback is not called
2335 
+     * on the initialization/creation of the popper, but only on subsequent
2336 
+     * updates.<br />
2337 
+     * By default, is set to no-op.<br />
2338 
+     * Access Popper.js instance with `data.instance`.
2339 
+     * @prop {onUpdate}
2340 
+     */
2341 
+    onUpdate: function onUpdate() {},
2342 
+
2343 
+    /**
2344 
+     * List of modifiers used to modify the offsets before they are applied to the popper.
2345 
+     * They provide most of the functionalities of Popper.js
2346 
+     * @prop {modifiers}
2347 
+     */
2348 
+    modifiers: modifiers
2349 
+  };
2350 
+
2351 
+  /**
2352 
+   * @callback onCreate
2353 
+   * @param {dataObject} data
2354 
+   */
2355 
+
2356 
+  /**
2357 
+   * @callback onUpdate
2358 
+   * @param {dataObject} data
2359 
+   */
2360 
+
2361 
+// Utils
2362 
+// Methods
2363 
+  var Popper = function () {
2364 
+    /**
2365 
+     * Create a new Popper.js instance
2366 
+     * @class Popper
2367 
+     * @param {HTMLElement|referenceObject} reference - The reference element used to position the popper
2368 
+     * @param {HTMLElement} popper - The HTML element used as popper.
2369 
+     * @param {Object} options - Your custom options to override the ones defined in [Defaults](#defaults)
2370 
+     * @return {Object} instance - The generated Popper.js instance
2371 
+     */
2372 
+    function Popper(reference, popper) {
2373 
+      var _this = this;
2374 
+
2375 
+      var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
2376 
+      classCallCheck(this, Popper);
2377 
+
2378 
+      this.scheduleUpdate = function () {
2379 
+        return requestAnimationFrame(_this.update);
2380 
+      };
2381 
+
2382 
+      // make update() debounced, so that it only runs at most once-per-tick
2383 
+      this.update = debounce(this.update.bind(this));
2384 
+
2385 
+      // with {} we create a new object with the options inside it
2386 
+      this.options = _extends({}, Popper.Defaults, options);
2387 
+
2388 
+      // init state
2389 
+      this.state = {
2390 
+        isDestroyed: false,
2391 
+        isCreated: false,
2392 
+        scrollParents: []
2393 
+      };
2394 
+
2395 
+      // get reference and popper elements (allow jQuery wrappers)
2396 
+      this.reference = reference && reference.jquery ? reference[0] : reference;
2397 
+      this.popper = popper && popper.jquery ? popper[0] : popper;
2398 
+
2399 
+      // Deep merge modifiers options
2400 
+      this.options.modifiers = {};
2401 
+      Object.keys(_extends({}, Popper.Defaults.modifiers, options.modifiers)).forEach(function (name) {
2402 
+        _this.options.modifiers[name] = _extends({}, Popper.Defaults.modifiers[name] || {}, options.modifiers ? options.modifiers[name] : {});
2403 
+      });
2404 
+
2405 
+      // Refactoring modifiers' list (Object => Array)
2406 
+      this.modifiers = Object.keys(this.options.modifiers).map(function (name) {
2407 
+        return _extends({
2408 
+          name: name
2409 
+        }, _this.options.modifiers[name]);
2410 
+      })
2411 
+      // sort the modifiers by order
2412 
+        .sort(function (a, b) {
2413 
+          return a.order - b.order;
2414 
+        });
2415 
+
2416 
+      // modifiers have the ability to execute arbitrary code when Popper.js get inited
2417 
+      // such code is executed in the same order of its modifier
2418 
+      // they could add new properties to their options configuration
2419 
+      // BE AWARE: don't add options to `options.modifiers.name` but to `modifierOptions`!
2420 
+      this.modifiers.forEach(function (modifierOptions) {
2421 
+        if (modifierOptions.enabled && isFunction(modifierOptions.onLoad)) {
2422 
+          modifierOptions.onLoad(_this.reference, _this.popper, _this.options, modifierOptions, _this.state);
2423 
+        }
2424 
+      });
2425 
+
2426 
+      // fire the first update to position the popper in the right place
2427 
+      this.update();
2428 
+
2429 
+      var eventsEnabled = this.options.eventsEnabled;
2430 
+      if (eventsEnabled) {
2431 
+        // setup event listeners, they will take care of update the position in specific situations
2432 
+        this.enableEventListeners();
2433 
+      }
2434 
+
2435 
+      this.state.eventsEnabled = eventsEnabled;
2436 
+    }
2437 
+
2438 
+    // We can't use class properties because they don't get listed in the
2439 
+    // class prototype and break stuff like Sinon stubs
2440 
+
2441 
+
2442 
+    createClass(Popper, [{
2443 
+      key: 'update',
2444 
+      value: function update$$1() {
2445 
+        return update.call(this);
2446 
+      }
2447 
+    }, {
2448 
+      key: 'destroy',
2449 
+      value: function destroy$$1() {
2450 
+        return destroy.call(this);
2451 
+      }
2452 
+    }, {
2453 
+      key: 'enableEventListeners',
2454 
+      value: function enableEventListeners$$1() {
2455 
+        return enableEventListeners.call(this);
2456 
+      }
2457 
+    }, {
2458 
+      key: 'disableEventListeners',
2459 
+      value: function disableEventListeners$$1() {
2460 
+        return disableEventListeners.call(this);
2461 
+      }
2462 
+
2463 
+      /**
2464 
+       * Schedule an update, it will run on the next UI update available
2465 
+       * @method scheduleUpdate
2466 
+       * @memberof Popper
2467 
+       */
2468 
+
2469 
+
2470 
+      /**
2471 
+       * Collection of utilities useful when writing custom modifiers.
2472 
+       * Starting from version 1.7, this method is available only if you
2473 
+       * include `popper-utils.js` before `popper.js`.
2474 
+       *
2475 
+       * **DEPRECATION**: This way to access PopperUtils is deprecated
2476 
+       * and will be removed in v2! Use the PopperUtils module directly instead.
2477 
+       * Due to the high instability of the methods contained in Utils, we can't
2478 
+       * guarantee them to follow semver. Use them at your own risk!
2479 
+       * @static
2480 
+       * @private
2481 
+       * @type {Object}
2482 
+       * @deprecated since version 1.8
2483 
+       * @member Utils
2484 
+       * @memberof Popper
2485 
+       */
2486 
+
2487 
+    }]);
2488 
+    return Popper;
2489 
+  }();
2490 
+
2491 
+  /**
2492 
+   * The `referenceObject` is an object that provides an interface compatible with Popper.js
2493 
+   * and lets you use it as replacement of a real DOM node.<br />
2494 
+   * You can use this method to position a popper relatively to a set of coordinates
2495 
+   * in case you don't have a DOM node to use as reference.
2496 
+   *
2497 
+   * ```
2498 
+   * new Popper(referenceObject, popperNode);
2499 
+   * ```
2500 
+   *
2501 
+   * NB: This feature isn't supported in Internet Explorer 10
2502 
+   * @name referenceObject
2503 
+   * @property {Function} data.getBoundingClientRect
2504 
+   * A function that returns a set of coordinates compatible with the native `getBoundingClientRect` method.
2505 
+   * @property {number} data.clientWidth
2506 
+   * An ES6 getter that will return the width of the virtual reference element.
2507 
+   * @property {number} data.clientHeight
2508 
+   * An ES6 getter that will return the height of the virtual reference element.
2509 
+   */
2510 
+
2511 
+
2512 
+  Popper.Utils = (typeof window !== 'undefined' ? window : global).PopperUtils;
2513 
+  Popper.placements = placements;
2514 
+  Popper.Defaults = Defaults;
2515 
+
2516 
+  return Popper;
2517 
+
2518 
+})));
2519 
+//# sourceMappingURL=popper.js.map
0 2520 
\ No newline at end of file