in Hands-on lab/lab-files/src/Contoso Sports League/Contoso.Apps.SportsLeague.Web/wwwroot/js/plugins.js [1122:1172]
Modal.prototype.backdrop = function (callback) {
var that = this
var animate = this.$element.hasClass('fade') ? 'fade' : ''
if (this.isShown && this.options.backdrop) {
var doAnimate = $.support.transition && animate
this.$backdrop = $(document.createElement('div'))
.addClass('modal-backdrop ' + animate)
.appendTo(this.$body)
this.$element.on('click.dismiss.bs.modal', $.proxy(function (e) {
if (this.ignoreBackdropClick) {
this.ignoreBackdropClick = false
return
}
if (e.target !== e.currentTarget) return
this.options.backdrop == 'static'
? this.$element[0].focus()
: this.hide()
}, this))
if (doAnimate) this.$backdrop[0].offsetWidth // force reflow
this.$backdrop.addClass('in')
if (!callback) return
doAnimate ?
this.$backdrop
.one('bsTransitionEnd', callback)
.emulateTransitionEnd(Modal.BACKDROP_TRANSITION_DURATION) :
callback()
} else if (!this.isShown && this.$backdrop) {
this.$backdrop.removeClass('in')
var callbackRemove = function () {
that.removeBackdrop()
callback && callback()
}
$.support.transition && this.$element.hasClass('fade') ?
this.$backdrop
.one('bsTransitionEnd', callbackRemove)
.emulateTransitionEnd(Modal.BACKDROP_TRANSITION_DURATION) :
callbackRemove()
} else if (callback) {
callback()
}
}