Broadcast/emit - are they synchronous?

[jvarg...@gmail.com]

Hi Everyone,

I have a nested directive structure. The navigation buttons are in the parent directive template. When the navigation is clicked  the handler in the parent should call  a "validate" method on some of the child directives. If all child directive return a success, the the parent should submit some data to the server via an injected service. Does it make sense to use broadcast and emit for implementing this?

I am not sure how to make the handler in  the parent to stop processing after it has broadcasted the "navigation" event to the interested child directives and resume only after all of them have returned a success.

Any help is appreciated.

Regards,
John

[Pawel Kozlowski]

Could you try to prepare a jsfiddle or a plunk with your use case?

It is kind of hard to help without live code as your description is a bit "abstract".

Cheers,

Pawel

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[John]

Restating my question:

Consider the following code snippet in a parent controller

Code A
$scope.$broadcast('myevent')
Code B

Does Code B get executed before or after all the listeners in the chid directives have processed the event.

Thanks
John

[Peter Bacon Darwin]

The $broadcast and $on are synchronous, but your handlers may be asynchronous.

--

[John]

Thanks Pete. I would appreciate if you could explain a bit more "but your handlers may be asynchronous."

Regards,
Jon

 

On Wednesday, October 17, 2012 3:20:19 PM UTC-4, Peter Bacon Darwin wrote:

The $broadcast and $on are synchronous, but your handlers may be asynchronous.

On 17 October 2012 19:05, John <pilo...@gmail.com> wrote:

Restating my question:

Consider the following code snippet in a parent controller

Code A
$scope.$broadcast('myevent')
Code B

Does Code B get executed before or after all the listeners in the chid directives have processed the event.

Thanks
John

[Peter Bacon Darwin]

If I do something like this:

$rootScope.$on('someEvent', function() {

  $timeout(function() {

    // Do some stuff

  });

});

Then the "Do some stuff" will be done asynchronously and the event broadcast will finish before this stuff is done.  A classic case would be calling a $http request in an event handler.

Pete