https://www.archives.gov/sites/all/themes/nara/assets/javascripts/bootstrap/dropdown.js?tluiwm

1/* ========================================================================
2 * Bootstrap: dropdown.js v3.2.0
3 * http://getbootstrap.com/javascript/#dropdowns
4 * ========================================================================
5 * Copyright 2011-2014 Twitter, Inc.
6 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
7 * ======================================================================== */
8
9
10+function ($) {
11  'use strict';
12
13  // DROPDOWN CLASS DEFINITION
14  // =========================
15
16  var backdrop = '.dropdown-backdrop'
17  var toggle   = '[data-toggle="dropdown"]'
18  var Dropdown = function (element) {
19    $(element).on('click.bs.dropdown', this.toggle)
20  }
21
22  Dropdown.VERSION = '3.2.0'
23
24  Dropdown.prototype.toggle = function (e) {
25    var $this = $(this)
26
27    if ($this.is('.disabled, :disabled')) return
28
29    var $parent  = getParent($this)
30    var isActive = $parent.hasClass('open')
31
32    clearMenus()
33
34    if (!isActive) {
35      if ('ontouchstart' in document.documentElement && !$parent.closest('.navbar-nav').length) {
36        // if mobile we use a backdrop because click events don't delegate
37        $('<div class="dropdown-backdrop"/>').insertAfter($(this)).on('click', clearMenus)
38      }
39
40      var relatedTarget = { relatedTarget: this }
41      $parent.trigger(e = $.Event('show.bs.dropdown', relatedTarget))
42
43      if (e.isDefaultPrevented()) return
44
45      $this.trigger('focus')
46
47      $parent
48        .toggleClass('open')
49        .trigger('shown.bs.dropdown', relatedTarget)
50    }
51
52    return false
53  }
54
55  Dropdown.prototype.keydown = function (e) {
56    if (!/(38|40|27)/.test(e.keyCode)) return
57
58    var $this = $(this)
59
60    e.preventDefault()
61    e.stopPropagation()
62
63    if ($this.is('.disabled, :disabled')) return
64
65    var $parent  = getParent($this)
66    var isActive = $parent.hasClass('open')
67
68    if (!isActive || (isActive && e.keyCode == 27)) {
69      if (e.which == 27) $parent.find(toggle).trigger('focus')
70      return $this.trigger('click')
71    }
72
73    var desc = ' li:not(.divider):visible a'
74    var $items = $parent.find('[role="menu"]' + desc + ', [role="listbox"]' + desc)
75
76    if (!$items.length) return
77
78    var index = $items.index($items.filter(':focus'))
79
80    if (e.keyCode == 38 && index > 0)                 index--                        // up
81    if (e.keyCode == 40 && index < $items.length - 1) index++                        // down
82    if (!~index)                                      index = 0
83
84    $items.eq(index).trigger('focus')
85  }
86
87  function clearMenus(e) {
88    if (e && e.which === 3) return
89    $(backdrop).remove()
90    $(toggle).each(function () {
91      var $parent = getParent($(this))
92      var relatedTarget = { relatedTarget: this }
93      if (!$parent.hasClass('open')) return
94      $parent.trigger(e = $.Event('hide.bs.dropdown', relatedTarget))
95      if (e.isDefaultPrevented()) return
96      $parent.removeClass('open').trigger('hidden.bs.dropdown', relatedTarget)
97    })
98  }
99
100  function getParent($this) {
101    var selector = $this.attr('data-target')
102
103    if (!selector) {
104      selector = $this.attr('href')
105      selector = selector && /#[A-Za-z]/.test(selector) && selector.replace(/.*(?=#[^\s]*$)/, '') // strip for ie7
106    }
107
108    var $parent = selector && $(selector)
109
110    return $parent && $parent.length ? $parent : $this.parent()
111  }
112
113
114  // DROPDOWN PLUGIN DEFINITION
115  // ==========================
116
117  function Plugin(option) {
118    return this.each(function () {
119      var $this = $(this)
120      var data  = $this.data('bs.dropdown')
121
122      if (!data) $this.data('bs.dropdown', (data = new Dropdown(this)))
123      if (typeof option == 'string') data[option].call($this)
124    })
125  }
126
127  var old = $.fn.dropdown
128
129  $.fn.dropdown             = Plugin
130  $.fn.dropdown.Constructor = Dropdown
131
132
133  // DROPDOWN NO CONFLICT
134  // ====================
135
136  $.fn.dropdown.noConflict = function () {
137    $.fn.dropdown = old
138    return this
139  }
140
141
142  // APPLY TO STANDARD DROPDOWN ELEMENTS
143  // ===================================
144
145  $(document)
146    .on('click.bs.dropdown.data-api', clearMenus)
147    .on('click.bs.dropdown.data-api', '.dropdown form', function (e) { e.stopPropagation() })
148    .on('click.bs.dropdown.data-api', toggle, Dropdown.prototype.toggle)
149    .on('keydown.bs.dropdown.data-api', toggle + ', [role="menu"], [role="listbox"]', Dropdown.prototype.keydown)
150
151}(jQuery);