Template:NTU-Singapore/JS

/* ========================================================================

* Bootstrap: dropdown.js v3.3.7
* http://getbootstrap.com/javascript/#dropdowns
* ========================================================================
* Copyright 2011-2016 Twitter, Inc.
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
* ======================================================================== */

+function ($) {

 'use strict';

 // 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 = '3.3.7'

 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()
 }

 function clearMenus(e) {
   if (e && e.which === 3) return
   $(backdrop).remove()
   $(toggle).each(function () {
     var $this         = $(this)
     var $parent       = getParent($this)
     var relatedTarget = { relatedTarget: this }

     if (!$parent.hasClass('open')) return

     if (e && e.type == 'click' && /input|textarea/i.test(e.target.tagName) && $.contains($parent[0], e.target)) return

     $parent.trigger(e = $.Event('hide.bs.dropdown', relatedTarget))

     if (e.isDefaultPrevented()) return

     $this.attr('aria-expanded', 'false')
     $parent.removeClass('open').trigger($.Event('hidden.bs.dropdown', relatedTarget))
   })
 }

 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
       $(document.createElement('div'))
         .addClass('dropdown-backdrop')
         .insertAfter($(this))
         .on('click', clearMenus)
     }

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

     if (e.isDefaultPrevented()) return

     $this
       .trigger('focus')
       .attr('aria-expanded', 'true')

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

   return false
 }

 Dropdown.prototype.keydown = function (e) {
   if (!/(38|40|27|32)/.test(e.which) || /input|textarea/i.test(e.target.tagName)) 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 && e.which != 27 || isActive && e.which == 27) {
     if (e.which == 27) $parent.find(toggle).trigger('focus')
     return $this.trigger('click')
   }

   var desc = ' li:not(.disabled):visible a'
   var $items = $parent.find('.dropdown-menu' + desc)

   if (!$items.length) return

   var index = $items.index(e.target)

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

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

 // 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, Dropdown.prototype.keydown)
   .on('keydown.bs.dropdown.data-api', '.dropdown-menu', Dropdown.prototype.keydown)

}(jQuery);