dropdown.js

var _createClass = function () { 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); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

/**
 * --------------------------------------------------------------------------
 * Bootstrap (v4.0.0-alpha.4): dropdown.js
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 * --------------------------------------------------------------------------
 */

var Dropdown = function ($) {

  /**
   * ------------------------------------------------------------------------
   * Constants
   * ------------------------------------------------------------------------
   */

  var NAME = 'dropdown';
  var VERSION = '4.0.0-alpha.4';
  var DATA_KEY = 'bs.dropdown';
  var EVENT_KEY = '.' + DATA_KEY;
  var DATA_API_KEY = '.data-api';
  var JQUERY_NO_CONFLICT = $.fn[NAME];
  var ESCAPE_KEYCODE = 27; // KeyboardEvent.which value for Escape (Esc) key
  var ARROW_UP_KEYCODE = 38; // KeyboardEvent.which value for up arrow key
  var ARROW_DOWN_KEYCODE = 40; // KeyboardEvent.which value for down arrow key
  var RIGHT_MOUSE_BUTTON_WHICH = 3; // MouseEvent.which value for the right button (assuming a right-handed mouse)

  var Event = {
    HIDE: 'hide' + EVENT_KEY,
    HIDDEN: 'hidden' + EVENT_KEY,
    SHOW: 'show' + EVENT_KEY,
    SHOWN: 'shown' + EVENT_KEY,
    CLICK: 'click' + EVENT_KEY,
    CLICK_DATA_API: 'click' + EVENT_KEY + DATA_API_KEY,
    KEYDOWN_DATA_API: 'keydown' + EVENT_KEY + DATA_API_KEY
  };

  var ClassName = {
    BACKDROP: 'dropdown-backdrop',
    DISABLED: 'disabled',
    OPEN: 'open'
  };

  var Selector = {
    BACKDROP: '.dropdown-backdrop',
    DATA_TOGGLE: '[data-toggle="dropdown"]',
    FORM_CHILD: '.dropdown form',
    ROLE_MENU: '[role="menu"]',
    ROLE_LISTBOX: '[role="listbox"]',
    NAVBAR_NAV: '.navbar-nav',
    VISIBLE_ITEMS: '[role="menu"] li:not(.disabled) a, ' + '[role="listbox"] li:not(.disabled) a'
  };

  /**
   * ------------------------------------------------------------------------
   * Class Definition
   * ------------------------------------------------------------------------
   */

  var Dropdown = function () {
    function Dropdown(element) {
      _classCallCheck(this, Dropdown);

      this._element = element;

      this._addEventListeners();
    }

    // getters

    // public

    Dropdown.prototype.toggle = function toggle() {
      if (this.disabled || $(this).hasClass(ClassName.DISABLED)) {
        return false;
      }

      var parent = Dropdown._getParentFromElement(this);
      var isActive = $(parent).hasClass(ClassName.OPEN);

      Dropdown._clearMenus();

      if (isActive) {
        return false;
      }

      if ('ontouchstart' in document.documentElement && !$(parent).closest(Selector.NAVBAR_NAV).length) {

        // if mobile we use a backdrop because click events don't delegate
        var dropdown = document.createElement('div');
        dropdown.className = ClassName.BACKDROP;
        $(dropdown).insertBefore(this);
        $(dropdown).on('click', Dropdown._clearMenus);
      }

      var relatedTarget = { relatedTarget: this };
      var showEvent = $.Event(Event.SHOW, relatedTarget);

      $(parent).trigger(showEvent);

      if (showEvent.isDefaultPrevented()) {
        return false;
      }

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

      $(parent).toggleClass(ClassName.OPEN);
      $(parent).trigger($.Event(Event.SHOWN, relatedTarget));

      return false;
    };

    Dropdown.prototype.dispose = function dispose() {
      $.removeData(this._element, DATA_KEY);
      $(this._element).off(EVENT_KEY);
      this._element = null;
    };

    // private

    Dropdown.prototype._addEventListeners = function _addEventListeners() {
      $(this._element).on(Event.CLICK, this.toggle);
    };

    // static

    Dropdown._jQueryInterface = function _jQueryInterface(config) {
      return this.each(function () {
        var data = $(this).data(DATA_KEY);

        if (!data) {
          $(this).data(DATA_KEY, data = new Dropdown(this));
        }

        if (typeof config === 'string') {
          if (data[config] === undefined) {
            throw new Error('No method named "' + config + '"');
          }
          data[config].call(this);
        }
      });
    };

    Dropdown._clearMenus = function _clearMenus(event) {
      if (event && event.which === RIGHT_MOUSE_BUTTON_WHICH) {
        return;
      }

      var backdrop = $(Selector.BACKDROP)[0];
      if (backdrop) {
        backdrop.parentNode.removeChild(backdrop);
      }

      var toggles = $.makeArray($(Selector.DATA_TOGGLE));

      for (var i = 0; i < toggles.length; i++) {
        var parent = Dropdown._getParentFromElement(toggles[i]);
        var relatedTarget = { relatedTarget: toggles[i] };

        if (!$(parent).hasClass(ClassName.OPEN)) {
          continue;
        }

        if (event && event.type === 'click' && /input|textarea/i.test(event.target.tagName) && $.contains(parent, event.target)) {
          continue;
        }

        var hideEvent = $.Event(Event.HIDE, relatedTarget);
        $(parent).trigger(hideEvent);
        if (hideEvent.isDefaultPrevented()) {
          continue;
        }

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

        $(parent).removeClass(ClassName.OPEN).trigger($.Event(Event.HIDDEN, relatedTarget));
      }
    };

    Dropdown._getParentFromElement = function _getParentFromElement(element) {
      var parent = void 0;
      var selector = Util.getSelectorFromElement(element);

      if (selector) {
        parent = $(selector)[0];
      }

      return parent || element.parentNode;
    };

    Dropdown._dataApiKeydownHandler = function _dataApiKeydownHandler(event) {
      if (!/(38|40|27|32)/.test(event.which) || /input|textarea/i.test(event.target.tagName)) {
        return;
      }

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

      if (this.disabled || $(this).hasClass(ClassName.DISABLED)) {
        return;
      }

      var parent = Dropdown._getParentFromElement(this);
      var isActive = $(parent).hasClass(ClassName.OPEN);

      if (!isActive && event.which !== ESCAPE_KEYCODE || isActive && event.which === ESCAPE_KEYCODE) {

        if (event.which === ESCAPE_KEYCODE) {
          var toggle = $(parent).find(Selector.DATA_TOGGLE)[0];
          $(toggle).trigger('focus');
        }

        $(this).trigger('click');
        return;
      }

      var items = $.makeArray($(Selector.VISIBLE_ITEMS));

      items = items.filter(function (item) {
        return item.offsetWidth || item.offsetHeight;
      });

      if (!items.length) {
        return;
      }

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

      if (event.which === ARROW_UP_KEYCODE && index > 0) {
        // up
        index--;
      }

      if (event.which === ARROW_DOWN_KEYCODE && index < items.length - 1) {
        // down
        index++;
      }

      if (index < 0) {
        index = 0;
      }

      items[index].focus();
    };

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

    return Dropdown;
  }();

  /**
   * ------------------------------------------------------------------------
   * Data Api implementation
   * ------------------------------------------------------------------------
   */

  $(document).on(Event.KEYDOWN_DATA_API, Selector.DATA_TOGGLE, Dropdown._dataApiKeydownHandler).on(Event.KEYDOWN_DATA_API, Selector.ROLE_MENU, Dropdown._dataApiKeydownHandler).on(Event.KEYDOWN_DATA_API, Selector.ROLE_LISTBOX, Dropdown._dataApiKeydownHandler).on(Event.CLICK_DATA_API, Dropdown._clearMenus).on(Event.CLICK_DATA_API, Selector.DATA_TOGGLE, Dropdown.prototype.toggle).on(Event.CLICK_DATA_API, Selector.FORM_CHILD, function (e) {
    e.stopPropagation();
  });

  /**
   * ------------------------------------------------------------------------
   * jQuery
   * ------------------------------------------------------------------------
   */

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

  return Dropdown;
}(jQuery);
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