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12/05/2021 12:32 pm
I have registered my listener to a $broadcast event using $on function
$scope.$on("onViewUpdated", this.callMe);
and I want to unregister this listener based on a particular business rule. But my problem is that once it is registered, I am not able to unregister it.
Is there any method in AngularJS to unregister a particular listener? A method like $on that unregister this event, maybe $off. So that based on the business logic I can say
$scope.$off("onViewUpdated", this.callMe);
and this function stop being called when somebody broadcast "onViewUpdated" event.
12/05/2021 12:33 pm
退订to a broadcast event in angularJS and to remove function registeredvia$on you need to store the returned function and call it to unsubscribe from the event.
var deregisterListener = $scope.$on("onViewUpdated", callMe); deregisterListener ();
The code is as follows:-
$on: function(name, listener) {
var namedListeners = this.$$listeners[name];
if (!namedListeners) {
this.$$listeners[name] = namedListeners = [];
}
namedListeners.push(listener);
return function() {
namedListeners[indexOf(namedListeners, listener)] = null;
};
},
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