in templates/ydotm/bootstrap3.js [611:628]
$(document).on('click.bs.collapse.data-api', '[data-toggle=collapse]', function (e) {
var $this = $(this), href
var target = $this.attr('data-target')
|| e.preventDefault()
|| (href = $this.attr('href')) && href.replace(/.*(?=#[^\s]+$)/, '') //strip for ie7
var $target = $(target)
var data = $target.data('bs.collapse')
var option = data ? 'toggle' : $this.data()
var parent = $this.attr('data-parent')
var $parent = parent && $(parent)
if (!data || !data.transitioning) {
if ($parent) $parent.find('[data-toggle=collapse][data-parent="' + parent + '"]').not($this).addClass('collapsed')
$this[$target.hasClass('in') ? 'addClass' : 'removeClass']('collapsed')
}
$target.collapse(option)
})