AngularJS: Changes to the model do not automatically reflect in the view

Currently, I am developing a web-based Twitter client using Angular.js, Node.js, and Socket.io. Tweets are pushed to the client via Socket.io, where a service listens for new tweets. When a new tweet arrives, the service triggers an event using $broadcast.

In my controller, there is an event listener that processes incoming tweets in a separate function. This function simply adds the new tweet to my tweet scope.

The issue I am facing is that my view is not updating even though I can see my scope growing. If anyone has an idea on how to resolve this problem, please let me know!

Here is additional code:

Service:

(function () {
    app.factory('Push', ['$rootScope', function ($rootScope) {
        socket.on('new-tweet', function (msg) {
            $rootScope.$broadcast('new-tweet', msg);
        });
    }]);
}());

Controller:

(function () {
    app.controller("StreamCtrl", function StreamCtrl ($scope, $rootScope, $http, Push) {
        $scope.tweets = [];

        $http
            .get('/stream')
            .then(function (res) {
                $scope.tweets = res.data;
            });

        $scope.addTweet = function (data) {
            $scope.tweets.push(data);
            console.log($scope.tweets);
        };

        $rootScope.$on('new-tweet', function (event, data) {
            if (!data.friends) {
                $scope.addTweet(data);
            }
        });
    });
}());

The complete project can be found here: https://github.com/hochitom/node-twitter-client

Answer №1

To resolve the issue, simply insert the following code snippet into your addTweet function:

$scope.addTweet = function (newData) {
            $scope.tweets.push(newData);
            $scope.$apply();
            console.log($scope.tweets);
        };

Answer №2

Personally, I find it more efficient to utilize $timeout (make sure to inject it into your controller) rather than using $apply:

 app.controller("StreamCtrl", function StreamCtrl ($scope, $timeout $rootScope, $http, Push) {

    //...

    $scope.addTweet = function (data) {
        $timeout(function() {
            $scope.tweets.push(data);
            console.log($scope.tweets);
        });
    };

    //...

});

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