how to add or remove class using jquery

Last updated:23rd Apr 2022

In this post, learn how can you add or remove a CSS class in Jquery. you can easily add or remove a class by clicking on the same button.

add or remove CSS class in jquery

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<style>
 .mystyle {
  padding: 30px;
  margin:5px;
  background-color: red;
  color:white;
  border: 1px solid green;
  font-size: 20px;
}
</style>
</head>
<body>

<p>Click the "clickme" button to remove the "mystyle" class from the div element which contain id mydiv:</p>

<button id="clickme">click me</button>

<div id="mydiv">
This is a DIV element.
</div>
<script>
 $(document).ready(function() {
   $("#clickme").click(function() {
	 if($("#mydiv").hasClass("mystyle")){
        $("#mydiv").removeClass("mystyle");
      } 
      else {
           $("#mydiv").addClass("mystyle");
      } 
    });
});
</script>
</body>
</html>

Run now

Explanation for adding or remove class

when you click on the 'click me' button, the jquery code will get executed.
in jquery, It will check whether mystyle a class is present or not. i.e if($("#mydiv").hasClass("mystyle")).
if mystyle class is present then it will remove class by using code, $("#mydiv").removeClass("mystyle");.
if a class is not present then else part will get executed and mystyle class will get added. $("#mydiv").addClass("mystyle");.