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How to add a class name to an element with JavaScript?
To add a class name to an element with JavaScript, the code is as follows −
Example
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style>
.newStyle {
font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
width: 100%;
padding: 25px;
background-color: rgb(147, 80, 255);
color: white;
font-size: 25px;
box-sizing: border-box;
text-align: center;
}
</style>
</head>
<body>
<h1>Adding className with JavaScript Example</h1>
<button class="btn">Click here</button>
<h2>Click the above button to add className to below div</h2>
<div id="sampleDiv">
This is a DIV element.
</div>
<script>
document.querySelector(".btn").addEventListener("click", addClassName);
function addClassName() {
var element = document.getElementById("sampleDiv");
element.classList.add("newStyle");
}
</script>
</body>
</html>Output
The above code will produce the following output −
On clicking the “Click here” button −
Updated on: 08-May-2020
308 Views
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