https://manuelbaumann.de/starter-template-Dateien/bootstrap-dropdown.js

1/* ============================================================
2 * bootstrap-dropdown.js v2.1.1
3 * http://twitter.github.com/bootstrap/javascript.html#dropdowns
4 * ============================================================
5 * Copyright 2012 Twitter, Inc.
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ============================================================ */
19
20
21!function ($) {
22
23  "use strict"; // jshint ;_;
24
25
26 /* DROPDOWN CLASS DEFINITION
27  * ========================= */
28
29  var toggle = '[data-toggle=dropdown]'
30    , Dropdown = function (element) {
31        var $el = $(element).on('click.dropdown.data-api', this.toggle)
32        $('html').on('click.dropdown.data-api', function () {
33          $el.parent().removeClass('open')
34        })
35      }
36
37  Dropdown.prototype = {
38
39    constructor: Dropdown
40
41  , toggle: function (e) {
42      var $this = $(this)
43        , $parent
44        , isActive
45
46      if ($this.is('.disabled, :disabled')) return
47
48      $parent = getParent($this)
49
50      isActive = $parent.hasClass('open')
51
52      clearMenus()
53
54      if (!isActive) {
55        $parent.toggleClass('open')
56        $this.focus()
57      }
58
59      return false
60    }
61
62  , keydown: function (e) {
63      var $this
64        , $items
65        , $active
66        , $parent
67        , isActive
68        , index
69
70      if (!/(38|40|27)/.test(e.keyCode)) return
71
72      $this = $(this)
73
74      e.preventDefault()
75      e.stopPropagation()
76
77      if ($this.is('.disabled, :disabled')) return
78
79      $parent = getParent($this)
80
81      isActive = $parent.hasClass('open')
82
83      if (!isActive || (isActive && e.keyCode == 27)) return $this.click()
84
85      $items = $('[role=menu] li:not(.divider) a', $parent)
86
87      if (!$items.length) return
88
89      index = $items.index($items.filter(':focus'))
90
91      if (e.keyCode == 38 && index > 0) index--                                        // up
92      if (e.keyCode == 40 && index < $items.length - 1) index++                        // down
93      if (!~index) index = 0
94
95      $items
96        .eq(index)
97        .focus()
98    }
99
100  }
101
102  function clearMenus() {
103    getParent($(toggle))
104      .removeClass('open')
105  }
106
107  function getParent($this) {
108    var selector = $this.attr('data-target')
109      , $parent
110
111    if (!selector) {
112      selector = $this.attr('href')
113      selector = selector && /#/.test(selector) && selector.replace(/.*(?=#[^\s]*$)/, '') //strip for ie7
114    }
115
116    $parent = $(selector)
117    $parent.length || ($parent = $this.parent())
118
119    return $parent
120  }
121
122
123  /* DROPDOWN PLUGIN DEFINITION
124   * ========================== */
125
126  $.fn.dropdown = function (option) {
127    return this.each(function () {
128      var $this = $(this)
129        , data = $this.data('dropdown')
130      if (!data) $this.data('dropdown', (data = new Dropdown(this)))
131      if (typeof option == 'string') data[option].call($this)
132    })
133  }
134
135  $.fn.dropdown.Constructor = Dropdown
136
137
138  /* APPLY TO STANDARD DROPDOWN ELEMENTS
139   * =================================== */
140
141  $(function () {
142    $('html')
143      .on('click.dropdown.data-api touchstart.dropdown.data-api', clearMenus)
144    $('body')
145      .on('click.dropdown touchstart.dropdown.data-api', '.dropdown form', function (e) { e.stopPropagation() })
146      .on('click.dropdown.data-api touchstart.dropdown.data-api'  , toggle, Dropdown.prototype.toggle)
147      .on('keydown.dropdown.data-api touchstart.dropdown.data-api', toggle + ', [role=menu]' , Dropdown.prototype.keydown)
148  })
149
150}(window.jQuery);