dropdown.js

/* ========================================================================
 * Bootstrap: dropdown.js v3.1.1
 * http://getbootstrap.com/javascript/#dropdowns
 * ========================================================================
 * Copyright 2011-2014 Twitter, Inc.
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 * ======================================================================== */


+function () { 'use strict';

  (function (o_o) {
    typeof define  == 'function' && define.amd ? define(['jquery'], o_o) :
    typeof exports == 'object' ? o_o(require('jquery')) : o_o(jQuery)
  })(function ($) {

    // DROPDOWN CLASS DEFINITION
    // =========================

    var backdrop = '.dropdown-backdrop'
    var toggle   = '[data-toggle="dropdown"]'
    var Dropdown = function (element) {
      $(element).on('click.bs.dropdown', this.toggle)
    }

    Dropdown.VERSION = '3.1.1'

    Dropdown.prototype.toggle = function (e) {
      var $this = $(this)

      if ($this.is('.disabled, :disabled')) return

      var $parent  = getParent($this)
      var isActive = $parent.hasClass('open')

      clearMenus()

      if (!isActive) {
        if ('ontouchstart' in document.documentElement && !$parent.closest('.navbar-nav').length) {
          // if mobile we use a backdrop because click events don't delegate
          $('<div class="dropdown-backdrop"/>').insertAfter($(this)).on('click', clearMenus)
        }

        var relatedTarget = { relatedTarget: this }
        $parent.trigger(e = $.Event('show.bs.dropdown', relatedTarget))

        if (e.isDefaultPrevented()) return

        $this.trigger('focus')

        $parent
          .toggleClass('open')
          .trigger('shown.bs.dropdown', relatedTarget)
      }

      return false
    }

    Dropdown.prototype.keydown = function (e) {
      if (!/(38|40|27)/.test(e.keyCode)) return

      var $this = $(this)

      e.preventDefault()
      e.stopPropagation()

      if ($this.is('.disabled, :disabled')) return

      var $parent  = getParent($this)
      var isActive = $parent.hasClass('open')

      if (!isActive || (isActive && e.keyCode == 27)) {
        if (e.which == 27) $parent.find(toggle).trigger('focus')
        return $this.trigger('click')
      }

      var desc = ' li:not(.divider):visible a'
      var $items = $parent.find('[role="menu"]' + desc + ', [role="listbox"]' + desc)

      if (!$items.length) return

      var index = $items.index($items.filter(':focus'))

      if (e.keyCode == 38 && index > 0)                 index--                        // up
      if (e.keyCode == 40 && index < $items.length - 1) index++                        // down
      if (!~index)                                      index = 0

      $items.eq(index).trigger('focus')
    }

    function clearMenus(e) {
      if (e && e.which === 3) return
      $(backdrop).remove()
      $(toggle).each(function () {
        var $parent = getParent($(this))
        var relatedTarget = { relatedTarget: this }
        if (!$parent.hasClass('open')) return
        $parent.trigger(e = $.Event('hide.bs.dropdown', relatedTarget))
        if (e.isDefaultPrevented()) return
        $parent.removeClass('open').trigger('hidden.bs.dropdown', relatedTarget)
      })
    }

    function getParent($this) {
      var selector = $this.attr('data-target')

      if (!selector) {
        selector = $this.attr('href')
        selector = selector && /#[A-Za-z]/.test(selector) && selector.replace(/.*(?=#[^\s]*$)/, '') //strip for ie7
      }

      var $parent = selector && $(selector)

      return $parent && $parent.length ? $parent : $this.parent()
    }


    // DROPDOWN PLUGIN DEFINITION
    // ==========================

    function Plugin(option) {
      return this.each(function () {
        var $this = $(this)
        var data  = $this.data('bs.dropdown')

        if (!data) $this.data('bs.dropdown', (data = new Dropdown(this)))
        if (typeof option == 'string') data[option].call($this)
      })
    }

    var old = $.fn.dropdown

    $.fn.dropdown             = Plugin
    $.fn.dropdown.Constructor = Dropdown


    // DROPDOWN NO CONFLICT
    // ====================

    $.fn.dropdown.noConflict = function () {
      $.fn.dropdown = old
      return this
    }


    // APPLY TO STANDARD DROPDOWN ELEMENTS
    // ===================================

    $(document)
      .on('click.bs.dropdown.data-api', clearMenus)
      .on('click.bs.dropdown.data-api', '.dropdown form', function (e) { e.stopPropagation() })
      .on('click.bs.dropdown.data-api', toggle, Dropdown.prototype.toggle)
      .on('keydown.bs.dropdown.data-api', toggle + ', [role="menu"], [role="listbox"]', Dropdown.prototype.keydown)

  })

}();