Broadcast and Emit in angularjs

In Angular $broadcast() service is always used to propagate event to all of his child controller and it’s registered parent $rootscope.scope listeners.  

  $rootScope.$broadcast('SummaryEvent', {

                priority: priority               

            });

$on() service is used to listen on any given type of event raised by $broadcast and $emit

   $scope.$on(''SummaryEvent'', function (event, args) {

Vm.priority=args.priority

        });

AngularJs  $broadcast ()  and  $on()  

$emit service is similar to $broadcast but it is used to propagate event to upwards through the scope hierarchy and notify to the registered $rootScope.Scope listeners

AngularJs  $on() and $emit()

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