Check if an element contains a class in JavaScript?

Question

Using plain JavaScript (not jQuery), Is there any way to check if an element contains a class?

Currently, I\'m doing this:

Answer 1

Try this one:

document.getElementsByClassName = function(cl) {
   var retnode = [];
   var myclass = new RegExp('\\b'+cl+'\\b');
   var elem = this.getElementsByTagName('*');
   for (var i = 0; i < elem.length; i++) {
       var classes = elem[i].className;
       if (myclass.test(classes)) retnode.push(elem[i]);
   }
    return retnode;
};