How to know the source of the event in Angularjs -


i looking way know source of event in angularjs routing. here scenario trying solve. when url changes want know whether change caused browser button or not. thought can 

$scope.$on('$routeupdate', function (event) {      //if source button stuff     // if not });

but event object doesn't have source information. did miss here? there better way it?

instead of $routeupdate use '$locationchangestart'

here's discussion angularjs guys: https://github.com/angular/angular.js/issues/2109

example:

$scope.$on('$locationchangestart', function(event) { if ($scope.form.$invalid) {    event.preventdefault();   } });

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