in app/html/libs/bootstrap/js/collapse.js [97:133]
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)
}