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Editing: collapse.js

/* ========================================================================
 * Bootstrap: collapse.js v3.3.1
 * http://getbootstrap.com/javascript/#collapse
 * ========================================================================
 * Copyright 2011-2014 Twitter, Inc.
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 * ======================================================================== */

+function ($) {
  'use strict';

// COLLAPSE PUBLIC CLASS DEFINITION
  // ================================

var Collapse = function (element, options) {
    this.$element      = $(element)
    this.options       = $.extend({}, Collapse.DEFAULTS, options)
    this.$trigger      = $(this.options.trigger).filter('[href="#' + element.id + '"], [data-target="#' + element.id + '"]')
    this.transitioning = null

if (this.options.parent) {
      this.$parent = this.getParent()
    } else {
      this.addAriaAndCollapsedClass(this.$element, this.$trigger)
    }

if (this.options.toggle) this.toggle()
  }

Collapse.VERSION  = '3.3.1'

Collapse.TRANSITION_DURATION = 350

Collapse.DEFAULTS = {
    toggle: true,
    trigger: '[data-toggle="collapse"]'
  }

Collapse.prototype.dimension = function () {
    var hasWidth = this.$element.hasClass('width')
    return hasWidth ? 'width' : 'height'
  }

Collapse.prototype.show = function () {
    if (this.transitioning || this.$element.hasClass('in')) return

var activesData
    var actives = this.$parent && this.$parent.find('> .panel').children('.in, .collapsing')

if (actives && actives.length) {
      activesData = actives.data('bs.collapse')
      if (activesData && activesData.transitioning) return
    }

var startEvent = $.Event('show.bs.collapse')
    this.$element.trigger(startEvent)
    if (startEvent.isDefaultPrevented()) return

if (actives && actives.length) {
      Plugin.call(actives, 'hide')
      activesData || actives.data('bs.collapse', null)
    }

var dimension = this.dimension()

this.$element
      .removeClass('collapse')
      .addClass('collapsing')[dimension](0)
      .attr('aria-expanded', true)

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

this.transitioning = 1

var complete = function () {
      this.$element
        .removeClass('collapsing')
        .addClass('collapse in')[dimension]('')
      this.transitioning = 0
      this.$element
        .trigger('shown.bs.collapse')
    }

if (!$.support.transition) return complete.call(this)

var scrollSize = $.camelCase(['scroll', dimension].join('-'))

this.$element
      .one('bsTransitionEnd', $.proxy(complete, this))
      .emulateTransitionEnd(Collapse.TRANSITION_DURATION)[dimension](this.$element[0][scrollSize])
  }

Collapse.prototype.hide = function () {
    if (this.transitioning || !this.$element.hasClass('in')) return

var startEvent = $.Event('hide.bs.collapse')
    this.$element.trigger(startEvent)
    if (startEvent.isDefaultPrevented()) return

var dimension = this.dimension()

this.$element[dimension](this.$element[dimension]())[0].offsetHeight

this.$element
      .addClass('collapsing')
      .removeClass('collapse in')
      .attr('aria-expanded', false)

this.$trigger
      .addClass('collapsed')
      .attr('aria-expanded', false)

this.transitioning = 1

var complete = function () {
      this.transitioning = 0
      this.$element
        .removeClass('collapsing')
        .addClass('collapse')
        .trigger('hidden.bs.collapse')
    }

if (!$.support.transition) return complete.call(this)

this.$element
      [dimension](0)
      .one('bsTransitionEnd', $.proxy(complete, this))
      .emulateTransitionEnd(Collapse.TRANSITION_DURATION)
  }

Collapse.prototype.toggle = function () {
    this[this.$element.hasClass('in') ? 'hide' : 'show']()
  }

Collapse.prototype.getParent = function () {
    return $(this.options.parent)
      .find('[data-toggle="collapse"][data-parent="' + this.options.parent + '"]')
      .each($.proxy(function (i, element) {
        var $element = $(element)
        this.addAriaAndCollapsedClass(getTargetFromTrigger($element), $element)
      }, this))
      .end()
  }

Collapse.prototype.addAriaAndCollapsedClass = function ($element, $trigger) {
    var isOpen = $element.hasClass('in')

$element.attr('aria-expanded', isOpen)
    $trigger
      .toggleClass('collapsed', !isOpen)
      .attr('aria-expanded', isOpen)
  }

function getTargetFromTrigger($trigger) {
    var href
    var target = $trigger.attr('data-target')
      || (href = $trigger.attr('href')) && href.replace(/.*(?=#[^\s]+$)/, '') // strip for ie7

return $(target)
  }

// COLLAPSE PLUGIN DEFINITION
  // ==========================

function Plugin(option) {
    return this.each(function () {
      var $this   = $(this)
      var data    = $this.data('bs.collapse')
      var options = $.extend({}, Collapse.DEFAULTS, $this.data(), typeof option == 'object' && option)

if (!data && options.toggle && option == 'show') options.toggle = false
      if (!data) $this.data('bs.collapse', (data = new Collapse(this, options)))
      if (typeof option == 'string') data[option]()
    })
  }

var old = $.fn.collapse

$.fn.collapse             = Plugin
  $.fn.collapse.Constructor = Collapse

// COLLAPSE NO CONFLICT
  // ====================

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

// COLLAPSE DATA-API
  // =================

$(document).on('click.bs.collapse.data-api', '[data-toggle="collapse"]', function (e) {
    var $this   = $(this)

if (!$this.attr('data-target')) e.preventDefault()

var $target = getTargetFromTrigger($this)
    var data    = $target.data('bs.collapse')
    var option  = data ? 'toggle' : $.extend({}, $this.data(), { trigger: this })

Plugin.call($target, option)
  })

}(jQuery);

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