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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
  <script src="http://code.jquery.com/jquery-2.0.2.js"></script>
  <script src="http://builds.emberjs.com/handlebars-1.0.0.js"></script>
  <script src="http://builds.emberjs.com/ember-latest.js"></script>
</head>
<body>
  <script type="text/x-handlebars" data-template-name="application">
    <h1>ember-latest jsbin</h1>
    {{outlet}}
  </script>
  <script type="text/x-handlebars" data-template-name="index">
    <h2>Index Content:</h2>
    <div {{action changeRand}}>{{ randHelper content.prop }}</div>
  </script>
</body>
</html>
 
App = Ember.Application.create({
  ready : function(){
    Ember.set('App.rand',Math.random());
  }
});
​
App.IndexRoute = Ember.Route.extend({
  model: function(){
    return { prop : "foo"};
  },
  actions : {
    changeRand : function(){
      Ember.set('App.rand',Math.random());
    }
  }
});
​
App.IndexController = Ember.Controller.extend({
  randChanged : function(){
    console.log('randChanged@!!!!');
    $.each(Ember.View.views,function(index,view){
       console.log('updating a view...');
       Ember.run(view,'rerender');
    });
  }.observes('App.rand')
});
​
​
Ember.Handlebars.helper('randHelper', function(key) {
  console.log('calling the helper');
  return key + " " + Ember.get('App.rand');
});
Output

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jagthedrummerpro
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