jQuery addClass() method

The jQuery addClass() method adds the specified class(es) to each of the set of matched elements.

Source Code

<!DOCTYPE html>
<html>
<head>
  <script src="http://code.jquery.com/jquery-latest.js"></script>
   <style>
 	 .highlight { border : 2px solid #1E8CBE; }
  </style>
</head>
<body>
  
<div class="div1">Div 1</div>
<div>Div 2</div>

<button>Click Here</button>

  
<script>
jQuery("button").click(function () {
	jQuery(".div1").addClass("highlight");
});
</script>
</body>
</html>

Demo

Following example finds the element with the class “div1″ and adds highlight class on it.

Div 1
Div 2

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