How to Use Chevron Icons to Indicate Bootstrap 3 Collapse State?

Bootstrap 3 Collapse State with Chevron Icons

The Bootstrap 3 framework provides an example for using a chevron icon to display the collapse state of an element. The following code adds a chevron icon to each panel heading and toggles the icon when the panel is collapsed or expanded:

<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://code.jquery.com/jquery-1.11.1.min.js" type="text/javascript"></script>
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" type="text/javascript"></script>

<div>

This solution uses the Bootstrap CSS classes to display the chevron icon, and toggles the glyphicon-chevron-down and glyphicon-chevron-up classes when the panel collapses or expands.

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