Angular $rootscope.$on where to activate deregistration function

Question

I have event listeners activated by:

var unregisterSubscription = $rootScope.$on(event, handler);

The event is activated in component and/or directive. I want the listener to listen when the user uses the scope of the listener, otherwise not.

now my question is where i activate the unregisterSubscription method?

Could you please add more context in your question? because this thing can be done in multiple places like `app.run` or inside a controller of current component itself.. — Pankaj Parkar, Oct 10 '16 at 07:07
You can call the `unregisterSubscription` method anytime to unsubscribe, as long as the variable in scope. Another option is to unsubscribe in the handler function itself — Ladmerc, Oct 10 '16 at 07:20
I can't call the function in handler because its not found from there.. — Zakk, Oct 10 '16 at 07:34

score 0 · Answer 1 · answered Oct 10 '16 at 07:13

0

You can create destroy event in controller.

$rootScope.$on('$destroy', function() {
    unregisterSubscription(); // Call unregisterSubscription method.
});

answered Oct 10 '16 at 07:13

1

$rootScope never gets destroyed during the application runtime – Ladmerc Oct 10 '16 at 07:18
@Ladmerc it could appear inside particular component controller's `$scope`. – Pankaj Parkar Oct 10 '16 at 07:19
You can inject $scope or $rootScope into the controller – Kriengkri Pongpanjanthra Oct 10 '16 at 07:21
Then your `destroy` event listener should be on the controller's `$scope`, not on `$rootScope` – Ladmerc Oct 10 '16 at 07:21
I don't have $scope – Zakk Oct 10 '16 at 08:55

1 Answers1