AngularFire

AngularFire is an officially supported AngularJS binding for Firebase. Firebase is a full backend so you don't need servers to build your Angular app!

The bindings let you associate a Firebase URL with a model (or set of models), and they will be transparently kept in sync across all clients currently using your app. The 2-way data binding offered by AngularJS works as normal, except that the changes are also sent to all other clients instead of just a server.

Live Demo: Simple chat room.

Live Demo: Real-time TODO app.

Usage

Include both firebase.js and angularFire.js in your application.

<script src="https://cdn.firebase.com/v0/firebase.js"></script>
<script src="angularFire.js"></script>

Add the module firebase as a dependency to your app module:

var myapp = angular.module('myapp', ['firebase']);

You now have two options.

Option 1: Implicit synchronization

This method is great if you want to implicitly synchronize a model with Firebase. All local changes will be automatically sent to Firebase, and all remote changes will instantly update the local model.

Set angularFire as a service dependency in your controller:

myapp.controller('MyCtrl', ['$scope', 'angularFire',
  function MyCtrl($scope, angularFire) {
    ...
  }
]);

Bind a Firebase URL to any model in $scope. The fourth argument is the type of model you want to use (can be any JavaScript type, you mostly want a dictionary or array):

var url = 'https://<my-firebase>.firebaseio.com/items';
$scope.items = angularFire(url, $scope, 'items', []);

Use the model in your markup as you normally would:

<ul ng-controller="MyCtrl">
  <li ng-repeat="item in items">{{item.name}}: {{item.desc}}</li>
</ul>

Data from Firebase is loaded asynchronously, so make sure you edit the model only after the promise has been fulfilled. You can do this using the then method (See the Angular documentation on $q for more on how promises work).

Place all your logic that will manipulate the model like this:

$scope.items.then(function() {
  // Add a new item by simply modifying the model directly.
  $scope.items.push({name: "Firebase", desc: "is awesome!"});
  // Or, attach a function to $scope that will let a directive in markup manipulate the model.
  $scope.removeItem = function() {
    $scope.items.splice($scope.toRemove, 1);
    $scope.toRemove = null;
  };
});

See the source for the controller behind the demo TODO app for a working example of this pattern.

Option 2: Explicit synchronization

This method is great if you want control over when local changes are synchronized to Firebase. Any changes made to a model won't be synchronized automatically, and you must invoke specific methods if you wish to update the remote data. All remote changes will automatically appear in the local model (1-way synchronization).

Set angularFireCollection as a service dependency in your controller:

myapp.controller('MyCtrl', ['$scope', 'angularFireCollection',
  function MyCtrl($scope, angularFireCollection) {
    ...
  }
]);

Create a collection at a specified Firebase URL and assign it to a model in $scope:

$scope.items = angularFireCollection(url);

Use the model as you normally would in your markup:

<ul ng-controller="MyCtrl">
  <li ng-repeat="item in items">{{item.name}}: {{item.desc}}</li>
</ul>

You can bind specific functions if you wish to add, remove or update objects in the collection with any Angular directive:

<form ng-submit="items.add(item)">
  <input type="text" ng-model="item.name" placeholder="Name" required/>
  <input type="text" ng-model="item.desc" placeholder="Description"/>
</form>

You can do the same with the remove and update methods.

See the source for the controller behind the demo chat app for a working example of this pattern.

License

MIT.