angularjs: broadcast event from service

Question

I would like to create a custom event in angularjs. The goal is that the event will be broadcast by a service and must be catched in a controller.

I have in my service :

function doSomething() {
        // do something...
        $rootScope.$broadcast("bced");
        $rootScope.$emit("emitted");
        console.log('event');
}

and my controller :

$rootScope.$on("bced",function(){
    console.log("catched");
});
$rootScope.$on("emitted",function(){
    console.log("catched");
});

$scope.$on("bced",function(){
    console.log("catched");
});
$scope.$on("emitted",function(){
    console.log("catched");
});

But I can't catch events in controller. console.log('event') is shown but I can't catch any events. Could someone explain me how to do that please? $rootScope is correctly declared in the service and in the controller.

Ivan Burnaev · Accepted Answer · 2015-07-02 08:37:16Z

12

Checkout a working demo:

var app = angular.module('core', []);
    app.service('SomeService', function($timeout, $rootScope){
        this.generateEvent = function(){
            $timeout(function(){
                $rootScope.$broadcast('event:show', {some: 'data'});
            }, 3000);    
        }
        
    })
    
    app.controller('MainController', function($scope, SomeService){
        SomeService.generateEvent();
        $scope.$on('event:show', function(event, data){
            $scope.test = data.some;
        })
    })

<div ng-app="core" ng-controller="MainController">
    {{test}}
</div>

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

answered Jul 2, 2015 at 8:37

Ivan Burnaev

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3 Comments

xroskam Over a year ago

Thank you. It work but the problem is that my controller can't call the function generateEvent at the good time. That why I need an event to inform the controller that something is done. Do you have an idea to solve my problem?

Ivan Burnaev Over a year ago

Can you get me a peace of code which describes your logic?

Mark Odey Over a year ago

I think this answers the question properly. Obviously, you wouldn't emit the event in the same context as where you declare you listener but I feel we get the point.

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