dropdown.js

/*!
  * Bootstrap dropdown.js v5.0.0-alpha1 (https://getbootstrap.com/)
  * Copyright 2011-2020 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  */
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('./dom/data.js'), require('./dom/event-handler.js'), require('./dom/manipulator.js'), require('popper.js'), require('./dom/selector-engine.js')) :
  typeof define === 'function' && define.amd ? define(['./dom/data.js', './dom/event-handler.js', './dom/manipulator.js', 'popper.js', './dom/selector-engine.js'], factory) :
  (global = global || self, global.Dropdown = factory(global.Data, global.EventHandler, global.Manipulator, global.Popper, global.SelectorEngine));
}(this, (function (Data, EventHandler, Manipulator, Popper, SelectorEngine) { 'use strict';

  Data = Data && Object.prototype.hasOwnProperty.call(Data, 'default') ? Data['default'] : Data;
  EventHandler = EventHandler && Object.prototype.hasOwnProperty.call(EventHandler, 'default') ? EventHandler['default'] : EventHandler;
  Manipulator = Manipulator && Object.prototype.hasOwnProperty.call(Manipulator, 'default') ? Manipulator['default'] : Manipulator;
  Popper = Popper && Object.prototype.hasOwnProperty.call(Popper, 'default') ? Popper['default'] : Popper;
  SelectorEngine = SelectorEngine && Object.prototype.hasOwnProperty.call(SelectorEngine, 'default') ? SelectorEngine['default'] : SelectorEngine;

  /**
   * --------------------------------------------------------------------------
   * Bootstrap (v5.0.0-alpha1): util/index.js
   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
   * --------------------------------------------------------------------------
   */

  var toType = function toType(obj) {
    if (obj === null || obj === undefined) {
      return "" + obj;
    }

    return {}.toString.call(obj).match(/\s([a-z]+)/i)[1].toLowerCase();
  };

  var getSelector = function getSelector(element) {
    var selector = element.getAttribute('data-target');

    if (!selector || selector === '#') {
      var hrefAttr = element.getAttribute('href');
      selector = hrefAttr && hrefAttr !== '#' ? hrefAttr.trim() : null;
    }

    return selector;
  };

  var getElementFromSelector = function getElementFromSelector(element) {
    var selector = getSelector(element);
    return selector ? document.querySelector(selector) : null;
  };

  var isElement = function isElement(obj) {
    return (obj[0] || obj).nodeType;
  };

  var typeCheckConfig = function typeCheckConfig(componentName, config, configTypes) {
    Object.keys(configTypes).forEach(function (property) {
      var expectedTypes = configTypes[property];
      var value = config[property];
      var valueType = value && isElement(value) ? 'element' : toType(value);

      if (!new RegExp(expectedTypes).test(valueType)) {
        throw new Error(componentName.toUpperCase() + ": " + ("Option \"" + property + "\" provided type \"" + valueType + "\" ") + ("but expected type \"" + expectedTypes + "\"."));
      }
    });
  };

  var isVisible = function isVisible(element) {
    if (!element) {
      return false;
    }

    if (element.style && element.parentNode && element.parentNode.style) {
      var elementStyle = getComputedStyle(element);
      var parentNodeStyle = getComputedStyle(element.parentNode);
      return elementStyle.display !== 'none' && parentNodeStyle.display !== 'none' && elementStyle.visibility !== 'hidden';
    }

    return false;
  };

  var noop = function noop() {
    return function () {};
  };

  var getjQuery = function getjQuery() {
    var _window = window,
        jQuery = _window.jQuery;

    if (jQuery && !document.body.hasAttribute('data-no-jquery')) {
      return jQuery;
    }

    return null;
  };

  function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }

  function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }

  function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

  function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

  function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
  /**
   * ------------------------------------------------------------------------
   * Constants
   * ------------------------------------------------------------------------
   */

  var NAME = 'dropdown';
  var VERSION = '5.0.0-alpha1';
  var DATA_KEY = 'bs.dropdown';
  var EVENT_KEY = "." + DATA_KEY;
  var DATA_API_KEY = '.data-api';
  var ESCAPE_KEY = 'Escape';
  var SPACE_KEY = 'Space';
  var TAB_KEY = 'Tab';
  var ARROW_UP_KEY = 'ArrowUp';
  var ARROW_DOWN_KEY = 'ArrowDown';
  var RIGHT_MOUSE_BUTTON = 2; // MouseEvent.button value for the secondary button, usually the right button

  var REGEXP_KEYDOWN = new RegExp(ARROW_UP_KEY + "|" + ARROW_DOWN_KEY + "|" + ESCAPE_KEY);
  var EVENT_HIDE = "hide" + EVENT_KEY;
  var EVENT_HIDDEN = "hidden" + EVENT_KEY;
  var EVENT_SHOW = "show" + EVENT_KEY;
  var EVENT_SHOWN = "shown" + EVENT_KEY;
  var EVENT_CLICK = "click" + EVENT_KEY;
  var EVENT_CLICK_DATA_API = "click" + EVENT_KEY + DATA_API_KEY;
  var EVENT_KEYDOWN_DATA_API = "keydown" + EVENT_KEY + DATA_API_KEY;
  var EVENT_KEYUP_DATA_API = "keyup" + EVENT_KEY + DATA_API_KEY;
  var CLASS_NAME_DISABLED = 'disabled';
  var CLASS_NAME_SHOW = 'show';
  var CLASS_NAME_DROPUP = 'dropup';
  var CLASS_NAME_DROPRIGHT = 'dropright';
  var CLASS_NAME_DROPLEFT = 'dropleft';
  var CLASS_NAME_MENURIGHT = 'dropdown-menu-right';
  var CLASS_NAME_NAVBAR = 'navbar';
  var CLASS_NAME_POSITION_STATIC = 'position-static';
  var SELECTOR_DATA_TOGGLE = '[data-toggle="dropdown"]';
  var SELECTOR_FORM_CHILD = '.dropdown form';
  var SELECTOR_MENU = '.dropdown-menu';
  var SELECTOR_NAVBAR_NAV = '.navbar-nav';
  var SELECTOR_VISIBLE_ITEMS = '.dropdown-menu .dropdown-item:not(.disabled):not(:disabled)';
  var PLACEMENT_TOP = 'top-start';
  var PLACEMENT_TOPEND = 'top-end';
  var PLACEMENT_BOTTOM = 'bottom-start';
  var PLACEMENT_BOTTOMEND = 'bottom-end';
  var PLACEMENT_RIGHT = 'right-start';
  var PLACEMENT_LEFT = 'left-start';
  var Default = {
    offset: 0,
    flip: true,
    boundary: 'scrollParent',
    reference: 'toggle',
    display: 'dynamic',
    popperConfig: null
  };
  var DefaultType = {
    offset: '(number|string|function)',
    flip: 'boolean',
    boundary: '(string|element)',
    reference: '(string|element)',
    display: 'string',
    popperConfig: '(null|object)'
  };
  /**
   * ------------------------------------------------------------------------
   * Class Definition
   * ------------------------------------------------------------------------
   */

  var Dropdown = /*#__PURE__*/function () {
    function Dropdown(element, config) {
      this._element = element;
      this._popper = null;
      this._config = this._getConfig(config);
      this._menu = this._getMenuElement();
      this._inNavbar = this._detectNavbar();

      this._addEventListeners();

      Data.setData(element, DATA_KEY, this);
    } // Getters


    var _proto = Dropdown.prototype;

    // Public
    _proto.toggle = function toggle() {
      if (this._element.disabled || this._element.classList.contains(CLASS_NAME_DISABLED)) {
        return;
      }

      var isActive = this._element.classList.contains(CLASS_NAME_SHOW);

      Dropdown.clearMenus();

      if (isActive) {
        return;
      }

      this.show();
    };

    _proto.show = function show() {
      if (this._element.disabled || this._element.classList.contains(CLASS_NAME_DISABLED) || this._menu.classList.contains(CLASS_NAME_SHOW)) {
        return;
      }

      var parent = Dropdown.getParentFromElement(this._element);
      var relatedTarget = {
        relatedTarget: this._element
      };
      var showEvent = EventHandler.trigger(this._element, EVENT_SHOW, relatedTarget);

      if (showEvent.defaultPrevented) {
        return;
      } // Disable totally Popper.js for Dropdown in Navbar


      if (!this._inNavbar) {
        if (typeof Popper === 'undefined') {
          throw new TypeError('Bootstrap\'s dropdowns require Popper.js (https://popper.js.org)');
        }

        var referenceElement = this._element;

        if (this._config.reference === 'parent') {
          referenceElement = parent;
        } else if (isElement(this._config.reference)) {
          referenceElement = this._config.reference; // Check if it's jQuery element

          if (typeof this._config.reference.jquery !== 'undefined') {
            referenceElement = this._config.reference[0];
          }
        } // If boundary is not `scrollParent`, then set position to `static`
        // to allow the menu to "escape" the scroll parent's boundaries
        // https://github.com/twbs/bootstrap/issues/24251


        if (this._config.boundary !== 'scrollParent') {
          parent.classList.add(CLASS_NAME_POSITION_STATIC);
        }

        this._popper = new Popper(referenceElement, this._menu, this._getPopperConfig());
      } // If this is a touch-enabled device we add extra
      // empty mouseover listeners to the body's immediate children;
      // only needed because of broken event delegation on iOS
      // https://www.quirksmode.org/blog/archives/2014/02/mouse_event_bub.html


      if ('ontouchstart' in document.documentElement && !parent.closest(SELECTOR_NAVBAR_NAV)) {
        var _ref;

        (_ref = []).concat.apply(_ref, document.body.children).forEach(function (elem) {
          return EventHandler.on(elem, 'mouseover', null, noop());
        });
      }

      this._element.focus();

      this._element.setAttribute('aria-expanded', true);

      Manipulator.toggleClass(this._menu, CLASS_NAME_SHOW);
      Manipulator.toggleClass(this._element, CLASS_NAME_SHOW);
      EventHandler.trigger(parent, EVENT_SHOWN, relatedTarget);
    };

    _proto.hide = function hide() {
      if (this._element.disabled || this._element.classList.contains(CLASS_NAME_DISABLED) || !this._menu.classList.contains(CLASS_NAME_SHOW)) {
        return;
      }

      var parent = Dropdown.getParentFromElement(this._element);
      var relatedTarget = {
        relatedTarget: this._element
      };
      var hideEvent = EventHandler.trigger(parent, EVENT_HIDE, relatedTarget);

      if (hideEvent.defaultPrevented) {
        return;
      }

      if (this._popper) {
        this._popper.destroy();
      }

      Manipulator.toggleClass(this._menu, CLASS_NAME_SHOW);
      Manipulator.toggleClass(this._element, CLASS_NAME_SHOW);
      EventHandler.trigger(parent, EVENT_HIDDEN, relatedTarget);
    };

    _proto.dispose = function dispose() {
      Data.removeData(this._element, DATA_KEY);
      EventHandler.off(this._element, EVENT_KEY);
      this._element = null;
      this._menu = null;

      if (this._popper) {
        this._popper.destroy();

        this._popper = null;
      }
    };

    _proto.update = function update() {
      this._inNavbar = this._detectNavbar();

      if (this._popper) {
        this._popper.scheduleUpdate();
      }
    } // Private
    ;

    _proto._addEventListeners = function _addEventListeners() {
      var _this = this;

      EventHandler.on(this._element, EVENT_CLICK, function (event) {
        event.preventDefault();
        event.stopPropagation();

        _this.toggle();
      });
    };

    _proto._getConfig = function _getConfig(config) {
      config = _objectSpread(_objectSpread(_objectSpread({}, this.constructor.Default), Manipulator.getDataAttributes(this._element)), config);
      typeCheckConfig(NAME, config, this.constructor.DefaultType);
      return config;
    };

    _proto._getMenuElement = function _getMenuElement() {
      return SelectorEngine.next(this._element, SELECTOR_MENU)[0];
    };

    _proto._getPlacement = function _getPlacement() {
      var parentDropdown = this._element.parentNode;
      var placement = PLACEMENT_BOTTOM; // Handle dropup

      if (parentDropdown.classList.contains(CLASS_NAME_DROPUP)) {
        placement = PLACEMENT_TOP;

        if (this._menu.classList.contains(CLASS_NAME_MENURIGHT)) {
          placement = PLACEMENT_TOPEND;
        }
      } else if (parentDropdown.classList.contains(CLASS_NAME_DROPRIGHT)) {
        placement = PLACEMENT_RIGHT;
      } else if (parentDropdown.classList.contains(CLASS_NAME_DROPLEFT)) {
        placement = PLACEMENT_LEFT;
      } else if (this._menu.classList.contains(CLASS_NAME_MENURIGHT)) {
        placement = PLACEMENT_BOTTOMEND;
      }

      return placement;
    };

    _proto._detectNavbar = function _detectNavbar() {
      return Boolean(this._element.closest("." + CLASS_NAME_NAVBAR));
    };

    _proto._getOffset = function _getOffset() {
      var _this2 = this;

      var offset = {};

      if (typeof this._config.offset === 'function') {
        offset.fn = function (data) {
          data.offsets = _objectSpread(_objectSpread({}, data.offsets), _this2._config.offset(data.offsets, _this2._element) || {});
          return data;
        };
      } else {
        offset.offset = this._config.offset;
      }

      return offset;
    };

    _proto._getPopperConfig = function _getPopperConfig() {
      var popperConfig = {
        placement: this._getPlacement(),
        modifiers: {
          offset: this._getOffset(),
          flip: {
            enabled: this._config.flip
          },
          preventOverflow: {
            boundariesElement: this._config.boundary
          }
        }
      }; // Disable Popper.js if we have a static display

      if (this._config.display === 'static') {
        popperConfig.modifiers.applyStyle = {
          enabled: false
        };
      }

      return _objectSpread(_objectSpread({}, popperConfig), this._config.popperConfig);
    } // Static
    ;

    Dropdown.dropdownInterface = function dropdownInterface(element, config) {
      var data = Data.getData(element, DATA_KEY);

      var _config = typeof config === 'object' ? config : null;

      if (!data) {
        data = new Dropdown(element, _config);
      }

      if (typeof config === 'string') {
        if (typeof data[config] === 'undefined') {
          throw new TypeError("No method named \"" + config + "\"");
        }

        data[config]();
      }
    };

    Dropdown.jQueryInterface = function jQueryInterface(config) {
      return this.each(function () {
        Dropdown.dropdownInterface(this, config);
      });
    };

    Dropdown.clearMenus = function clearMenus(event) {
      if (event && (event.button === RIGHT_MOUSE_BUTTON || event.type === 'keyup' && event.key !== TAB_KEY)) {
        return;
      }

      var toggles = SelectorEngine.find(SELECTOR_DATA_TOGGLE);

      for (var i = 0, len = toggles.length; i < len; i++) {
        var parent = Dropdown.getParentFromElement(toggles[i]);
        var context = Data.getData(toggles[i], DATA_KEY);
        var relatedTarget = {
          relatedTarget: toggles[i]
        };

        if (event && event.type === 'click') {
          relatedTarget.clickEvent = event;
        }

        if (!context) {
          continue;
        }

        var dropdownMenu = context._menu;

        if (!toggles[i].classList.contains(CLASS_NAME_SHOW)) {
          continue;
        }

        if (event && (event.type === 'click' && /input|textarea/i.test(event.target.tagName) || event.type === 'keyup' && event.key === TAB_KEY) && dropdownMenu.contains(event.target)) {
          continue;
        }

        var hideEvent = EventHandler.trigger(parent, EVENT_HIDE, relatedTarget);

        if (hideEvent.defaultPrevented) {
          continue;
        } // If this is a touch-enabled device we remove the extra
        // empty mouseover listeners we added for iOS support


        if ('ontouchstart' in document.documentElement) {
          var _ref2;

          (_ref2 = []).concat.apply(_ref2, document.body.children).forEach(function (elem) {
            return EventHandler.off(elem, 'mouseover', null, noop());
          });
        }

        toggles[i].setAttribute('aria-expanded', 'false');

        if (context._popper) {
          context._popper.destroy();
        }

        dropdownMenu.classList.remove(CLASS_NAME_SHOW);
        toggles[i].classList.remove(CLASS_NAME_SHOW);
        EventHandler.trigger(parent, EVENT_HIDDEN, relatedTarget);
      }
    };

    Dropdown.getParentFromElement = function getParentFromElement(element) {
      return getElementFromSelector(element) || element.parentNode;
    };

    Dropdown.dataApiKeydownHandler = function dataApiKeydownHandler(event) {
      // If not input/textarea:
      //  - And not a key in REGEXP_KEYDOWN => not a dropdown command
      // If input/textarea:
      //  - If space key => not a dropdown command
      //  - If key is other than escape
      //    - If key is not up or down => not a dropdown command
      //    - If trigger inside the menu => not a dropdown command
      if (/input|textarea/i.test(event.target.tagName) ? event.key === SPACE_KEY || event.key !== ESCAPE_KEY && (event.key !== ARROW_DOWN_KEY && event.key !== ARROW_UP_KEY || event.target.closest(SELECTOR_MENU)) : !REGEXP_KEYDOWN.test(event.key)) {
        return;
      }

      event.preventDefault();
      event.stopPropagation();

      if (this.disabled || this.classList.contains(CLASS_NAME_DISABLED)) {
        return;
      }

      var parent = Dropdown.getParentFromElement(this);
      var isActive = this.classList.contains(CLASS_NAME_SHOW);

      if (event.key === ESCAPE_KEY) {
        var button = this.matches(SELECTOR_DATA_TOGGLE) ? this : SelectorEngine.prev(this, SELECTOR_DATA_TOGGLE)[0];
        button.focus();
        Dropdown.clearMenus();
        return;
      }

      if (!isActive || event.key === SPACE_KEY) {
        Dropdown.clearMenus();
        return;
      }

      var items = SelectorEngine.find(SELECTOR_VISIBLE_ITEMS, parent).filter(isVisible);

      if (!items.length) {
        return;
      }

      var index = items.indexOf(event.target);

      if (event.key === ARROW_UP_KEY && index > 0) {
        // Up
        index--;
      }

      if (event.key === ARROW_DOWN_KEY && index < items.length - 1) {
        // Down
        index++;
      } // index is -1 if the first keydown is an ArrowUp


      index = index === -1 ? 0 : index;
      items[index].focus();
    };

    Dropdown.getInstance = function getInstance(element) {
      return Data.getData(element, DATA_KEY);
    };

    _createClass(Dropdown, null, [{
      key: "VERSION",
      get: function get() {
        return VERSION;
      }
    }, {
      key: "Default",
      get: function get() {
        return Default;
      }
    }, {
      key: "DefaultType",
      get: function get() {
        return DefaultType;
      }
    }]);

    return Dropdown;
  }();
  /**
   * ------------------------------------------------------------------------
   * Data Api implementation
   * ------------------------------------------------------------------------
   */


  EventHandler.on(document, EVENT_KEYDOWN_DATA_API, SELECTOR_DATA_TOGGLE, Dropdown.dataApiKeydownHandler);
  EventHandler.on(document, EVENT_KEYDOWN_DATA_API, SELECTOR_MENU, Dropdown.dataApiKeydownHandler);
  EventHandler.on(document, EVENT_CLICK_DATA_API, Dropdown.clearMenus);
  EventHandler.on(document, EVENT_KEYUP_DATA_API, Dropdown.clearMenus);
  EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_DATA_TOGGLE, function (event) {
    event.preventDefault();
    event.stopPropagation();
    Dropdown.dropdownInterface(this, 'toggle');
  });
  EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_FORM_CHILD, function (e) {
    return e.stopPropagation();
  });
  var $ = getjQuery();
  /**
   * ------------------------------------------------------------------------
   * jQuery
   * ------------------------------------------------------------------------
   * add .dropdown to jQuery only if jQuery is present
   */

  /* istanbul ignore if */

  if ($) {
    var JQUERY_NO_CONFLICT = $.fn[NAME];
    $.fn[NAME] = Dropdown.jQueryInterface;
    $.fn[NAME].Constructor = Dropdown;

    $.fn[NAME].noConflict = function () {
      $.fn[NAME] = JQUERY_NO_CONFLICT;
      return Dropdown.jQueryInterface;
    };
  }

  return Dropdown;

})));
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