27 Jan jQuery – Add CSS Class
To add a class to the selected element, use the addClass() method in jQuery. We can add:
- A single class
- Multiple classes
- Add a single class to different elements
- Add multiple classes to different elements
Before moving further, we’ve prepared a video tutorial to add a class to a selected element using jQuery:
Add a single class
We will add a single class demo here using the addClass() method in jQuery:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("h1").addClass("demo");
});
});
</script>
<style>
.demo {
background: blue;
color: white;
}
</style>
</head>
<body>
<h1>Heading 1</h1>
<p>This is demo text</p>
<h2>Heading 2</h2>
<p>This is another demo text.</p>
<button>Add a single class</button>
</body>
</html>
Output
Add Multiple Classes
We will add multiple classes i.e. demo and example here using the addClass() method in jQuery:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("h1").addClass("demo example");
});
});
</script>
<style>
.demo {
background: blue;
color: white;
}
.example {
border: 4px dashed yellow;
}
</style>
</head>
<body>
<h1>Heading 1</h1>
<p>This is demo text</p>
<h2>Heading 1</h2>
<p>This is another demo text.</p>
<button>Add multiple classes</button>
</body>
</html>
Output
Add a single class to different elements
We will add a single class demo here to more than one element, such as <h1>, <h2>, <h3> using the addClass() method in jQuery:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("h1, h2, h3").addClass("demo");
});
});
</script>
<style>
.demo {
background: blue;
color: white;
}
</style>
</head>
<body>
<h1>Heading 1</h1>
<p>This is demo text</p>
<h2>Heading 2</h2>
<p>This is another demo text.</p>
<h3>Heading 3</h3>
<p>This is yet another demo text.</p>
<button>Add a single class to different elements</button>
</body>
</html>
Output
Add multiple classes to different elements
We will add multiple classes i.e. demo and example here to different elements, such as <h1>, <h2>, <h3> using the addClass() method in jQuery:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("h1, h2, h3").addClass("demo example");
});
});
</script>
<style>
.demo {
background: blue;
color: white;
}
.example {
border: 4px dashed yellow;
}
</style>
</head>
<body>
<h1>Heading 1</h1>
<p>This is demo text</p>
<h2>Heading 2</h2>
<p>This is another demo text.</p>
<h3>Heading 3</h3>
<p>This is yet another demo text.</p>
<button>Add multiple classes to different elements</button>
</body>
</html>
Output
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