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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
  <script src="http://code.jquery.com/jquery-1.10.1.js"></script>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/handlebars.js/1.0.0-rc.4/handlebars.min.js"></script>
  <script src="http://builds.emberjs.com.s3.amazonaws.com/ember-1.0.0-rc.6.js"></script>
</head>
<body>
  <script type="text/x-handlebars">
    <button {{action toggle}} >Toggle</button>
    <div id="numbers">
      {{#if isShowingItems}}
        {{#view App.GroupedItemsView}}
        {{#each items}}
          <span>{{ this }}</span>
        {{/each}}
        {{/view}}
      {{/if}}
    </div>
  </script>
</body>
</html>
 
span {
  padding: 5px;
  display: inline-block;
  background-color: #AEf;
}
 
App = Em.Application.create();
​
App.ApplicationController = Em.Controller.extend({
  items: [],
  init: function () {
    for (var i=1; i<=2000; i++) {
      this.items.push(i);
    }
  },
  toggle: function () {
    this.toggleProperty('isShowingItems');
  }
});
​
// Make a view grouped with
//   App.MyView = Em.View.extend(App.GroupedViewMixin);
App.GroupedViewMixin = Em.Mixin.create({
  init: function() {
    this._super.apply(this, arguments);
    this.set('templateData.insideGroup', true);
  }
});
​
// Use directly with {{view App.GroupedView}} or a block
App.GroupedItemsView = Em.View.extend(App.GroupedViewMixin);
Output

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