Error: Attempting to push element into an undefined array

After struggling to get the firebase binds to work with knockoutjs, I decided to experiment with angularjs. I downloaded angularjs and started trying to manipulate some data. In my app.js file, I have the following code:

/* Controllers */

angular.module('MyCtrl3', ['$scope', 'angularFire'])
.controller ("MyCtrl3", function ($scope, angularFire) {
$scope.addMsg = function ($scope, angularFire) {
    var url = 'https://kingpinapp.firebaseio.com/msgs';
    var promise = angularFire(url, $scope, 'msgs', []);
    $scope.msgs.push({name: "Firebase", desc: "is awesome!"});

}
});

My HTML code is simple:

<!doctype html>
<html lang="en" ng-app>
<head>
<meta charset="utf-8">
<title>My AngularJS App</title>
<link rel="stylesheet" href="css/app.css"/>
<link rel="stylesheet" href="css/bootstrap.css"/>
</head>
<body>

<div>Angular seed app: v<span app-version></span></div>

<div ng-controller="MyCtrl3">

<button ng-click="addMsg()">Add</button>
</div>

<!-- bunch of scripts -->
</body>
</html>

I just want the add button to push the data to firebase. However, when I try it, I encounter this error in the console: Uncaught TypeError: Cannot call method 'push' of undefined. Here's the JSFiddle link for better understanding: http://jsfiddle.net/NHaZz/5/

Answer №1

When using AngularFire, remember that it returns a promise. This means you must wait for the promise to be fulfilled before manipulating the array. Use the then function to achieve this:

angular.module('MyCtrl3', ['$scope', 'angularFire'])
.controller ("MyCtrl3", function ($scope, angularFire) {
  var url = 'https://example.firebaseio.com/data';
  var promise = angularFire(url, $scope, 'dataSet', []);
  promise.then(function() {
    $scope.addData = function ($scope, angularFire) {
      $scope.dataSet.push({value: "Hello", desc: "World!"});
    }
  });
});

Answer №2

There has been an update in AngularFire 0.3.0, requiring a slight change in how URLs are handled. Instead of simply sending a URL using angularFire, you now need to provide:

new Firebase("example-url-to-your-firebase.com");

For example: http://jsfiddle.net/DR4r9/14/

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