parent.js is jQuery-based show or hide DOM by :radio, :checkbox checked attribute.
<html>
<head>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<script src="http://underscorejs.org/underscore-min.js"></script>
<script src="./lib/jquery-metadata.js"></script>
<script src="./parent.js"></script>
</head>
<body>
<input type="radio" value="1"/> show
<input type="radio" value="2"/> hide
<div class="parent" data="key:['1']">
hello world
</div>
</body>
</html>