in content/resources/js/bootstrap-modal.js [130:162]
function backdrop(callback) {
var that = this
, animate = this.$element.hasClass('fade') ? 'fade' : ''
if (this.isShown && this.options.backdrop) {
var doAnimate = $.support.transition && animate
this.$backdrop = $('<div class="modal-backdrop ' + animate + '" />')
.appendTo(document.body)
if (this.options.backdrop != 'static') {
this.$backdrop.click($.proxy(this.hide, this))
}
if (doAnimate) this.$backdrop[0].offsetWidth // force reflow
this.$backdrop.addClass('in')
doAnimate ?
this.$backdrop.one($.support.transition.end, callback) :
callback()
} else if (!this.isShown && this.$backdrop) {
this.$backdrop.removeClass('in')
$.support.transition && this.$element.hasClass('fade')?
this.$backdrop.one($.support.transition.end, $.proxy(removeBackdrop, this)) :
removeBackdrop.call(this)
} else if (callback) {
callback()
}
}