Use the hasClass() method to test if an element contains a JavaScript class.
Example
You can try to run the following code to test if an element i.e. <div> here contains a class
<html> <body> <div id="test" class="myClass"></div> <script> function hasClass(element, cls) { return (' ' + element.className + ' ').indexOf(' ' + cls + ' ') > -1; } var val1 = document.getElementById('test'); alert(hasClass(val1, 'myClass')); </script> </body> </html>