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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.min.js"></script>
</head>
<body>
  <script type="text/x-handlebars">
    <button {{action toggle}} >Toggle</button>
    <div id="numbers">
      {{eachInSpan items}}
    </div>
  </script>
</body>
</html>
 
span {
  padding: 5px;
  display: inline-block;
  background-color: #AEf;
}
 
App = Em.Application.create();
​
App.ApplicationController = Em.Controller.extend({
  items: [],
  allItems: [],
  init: function () {
    for (var i=1; i<=2000; i++) {
      this.allItems.push(i);
    }
  },
  toggle: function () {
    if (this.get("items.length") > 0) this.set("items", []);
    else this.set("items", this.allItems);
  }
});
​
    Em.Handlebars.registerBoundHelper('eachInSpan', function (items) {
  return (
    new Handlebars.SafeString(
      items.map(function (i) {
        return '<span>'+i+'</span>';
      })
    )
  );
});
Output 300px

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