``There seems to be an issue with the $broadcast event not being recognized

I am working with a simple service/factory:

angular.module('myapp').factory('User', ['$rootScope', function($rootScope) {
    return {
        hello: function() {
            console.log('Sending root scope message');
            $rootScope.$broadcast('saidhello', {greeting: 'hey'});
        }
    };
}]);

Within my controller, I am calling the hello method simply like this: User.hello(), and it logs the message in my console.

Now, I want to capture this event in a directive, but for some reason, it doesn't seem to be working...

angular.module('myapp').directive('user', ['User', function(User) {
    return {
        replace: true,
        restrict: 'EA',
        scope: true,
        link: ['scope', 'element', 'attrs', function(scope, element, attrs) {

            scope.$on('saidhello', function(event, data) {
                console.log('User said ' + data.greeting);
            });
        }]
    }
}]);

Despite my efforts, nothing is being logged. I even tried using timeout to ensure that the directive is loaded, but still no luck. I also attempted to use $emit instead of $broadcast.

The structure of my HTML looks like this:

<body>
    <div ng-controller="myController">
        <!-- Used to execute service -->
    </div>
    <user></user>
</body>

Answer №1

Shouldn't the link function be utilized instead of an array in this case? It seems more appropriate considering the static parameters.

link: function(scope, element, attrs) {

    scope.$on('saidhello', function(event, data) {
        console.log('User said ' + data.greeting);
    });

    // say hello
    User.hello();
}

http://plnkr.co/edit/Shj112rfu6dyTcUHPVfM?p=preview

Answer №2

One key problem is that controllers need to run before the DOM can be compiled in order to establish the necessary scope for the view.

When you trigger an event directly within the controller, it happens before the directive's listener has been set up.

As a result, by the time the listener is attached, the event has already occurred and passed.

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