Angular: Empty Fiddle

http://angularjs.org/

HTML

<script src="http://code.angularjs.org/angular-1.0.1.js"></script>
<link rel="stylesheet" href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/angular-ui-bootstrap/0.4.0/ui-bootstrap-tpls.min.js"></script>
<br>
<div ng-controller="CollapseDemoCtrl">
	<button class="btn" ng-click="isCollapsed = !isCollapsed">Toggle collapse</button>
	<hr>
	<div collapse="isCollapsed">
		<p>Some content</p> 
	</div>
</div>

JavaScript

var myApp = angular.module('myApp', ['ui.bootstrap']);

function CollapseDemoCtrl($scope) {
  $scope.isCollapsed = true;
}