BS3 - data-toggle - Expand/Collapse Panel - Attribute Handling Approach

HTML

<script src="http://bizamajig.com/bootstrap.js"></script>
<link rel="stylesheet" href="http://bizamajig.com/bootstrap.css">
<div class="navbar navbar-fixed-top">
    </div>

    <div class="container well">
      <div class="jumbotron">
        <h1>Hello, world!</h1>
        <p>Blah, blah.</p>
        <p><a class="btn btn-primary btn-large">Learn more &raquo;</a></p>
      </div>

      <!-- Example row of columns -->
      <div class="row">
        <div class="span4 collapse-group">
          <h2>Heading</h2>
           <p class="collapse" id="viewdetails">Donec id elit non mi porta gravida at eget metus. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus. Etiam porta sem malesuada magna mollis euismod. Donec sed odio dui. </p>
          <p><a class="btn" data-toggle="expand" data-target="#viewdetails">View details &raquo;</a></p>
        </div>
      </div>

CSS

body {
        padding-top: 60px;
        padding-bottom: 40px;
      }