angularjs custom trigger $rootScope:inprog error

At any point in time there can be only one $digest or $apply operation in progress

So when you try to trigger a event, there is possibility that $digest or $apply is already in progress.

There is a way out to overcome that situation with the use of $timeout. So if you want to trigger some event from inside other event callback code, you have wrap the code inside $timeout :

$timeout(function() {event.target.click();});