Very simple ng-model watch not working - angularjs

Question

Here is the jsfiddle.
http://jsfiddle.net/CLcfC/
code
var app = angular.module('app',['']);
app.controller('TestCtrl',function($scope){
$scope.text = 'Change Me';
$scope.$watch('text',function(){
alert('Changed !');
});
})
HTML
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js"></script>
<div ng-app="app">
<div ng-controller="TestCtrl">
<input type="text" ng-model='text'/>
<span>{{text}}</span>
</div>
</div>
I am not able to see the change in $scope.text. Please help.
This is so easy but what am I missing?

Answer 1

Change the module creation to this, make sure you don't put a empty string in the []. (Obvious the empty string is not a module that can be injected.)
var app = angular.module('app', []);
Demo: http://jsfiddle.net/MWa66/

Answer 2

Your JavaScript file loads after the AngularJS initialization and that's why it fails to find your module. In order to fix it change the initialization to a manual initialization.
First change your HTML and remove the ng-app directive:
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js"></script>
<div id="appRoot">
<div ng-controller="TestCtrl">
<input type="text" ng-model='text'/>
<span>{{text}}</span>
</div>
</div>
Then go to your JavaScript and use angular.bootstrap method to manually attach your module:
var app = angular.module('app',[]);
app.controller('TestCtrl',function($scope){
$scope.text = 'Change Me';
$scope.$watch('text',function(){
alert('Changed !');
});
});
angular.element(document).ready(function() {
angular.bootstrap(document.getElementById('appRoot'), ['app']);
});
You can find more help on manual AngularJS initialization here.

Answer 3

Thank you! I solved this annoying thing!
The solution that worked for me was that I use angular UI router and there I had used the following code
.state('app.monimes', {
url: "/monimes",
views: {
'menuContent' :{
templateUrl: "templates/monimes.html",
controller: 'sampleCtrl'
}
}
})
so then in the controller I had
/***
*
*Controller for tests..
*/
.controller('sampleCtrl',['$scope','sampleService', function($scope, $sampleService) {
$scope.username="em";
// Watch for changes on the username property.
// If there is a change, run the function
$scope.$watch('username', function(newUsername) {
// uses the $http service to call the GitHub API
// //log it
$scope.log(newUsername);
// and returns the resulting promise
$sampleService.events(newUsername)
.success(function(data, status, headers) {
// the success function wraps the response in data
// so we need to call data.data to fetch the raw data
$scope.events = data.data;
});
},true);
}
]);
and in the view I had
<div>
<label for="username">Type in a GitHub username</label>
<input type="text" ng-model="username" placeholder="Enter a GitHub username, like a user" />
<pre ng-show="username">{{ events }}</pre>
</div>
but that didn't work.
so I added ng-controller="sampleCtrl"
to the div and now it works :D
so that means that the view is loaded after the controller loads and the watcher doesn't get added to the watching variable.