jQuery: Add a CSS class using jQuery

Last update on July 22 2025 12:39:11 (UTC/GMT +8 hours)

jQuery Practical exercise Part - I : Exercise-37

Add a CSS class using jQuery.

Sample Solution:

HTML Code :

<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-git.js"></script>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Add  a CSS class using jQuery.</title>
</head>
<body>
 <p id="pid"  class="center"> jQuery Exercises</p>
 <input id="button1" type="button" value="Click to add a new Class" />
 </body>
</html>

CSS Code:

p.center {
    text-align: center;
    color: red;
}

p.large {
    font-size: 200%;
    color: blue;
}

JavaScript Code:

$(document).ready(function(){ 
  $('#button1').click(function(){   $('#pid').addClass('large');       
   });
});

Go to:

PREV : Change a CSS class using jQuery.
NEXT : Count child elements using jQuery.

See the Pen jquery-practical-exercise-37 by w3resource (@w3resource) on CodePen.

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