JavaScript adding a class name to the element
Last Updated :
08 Dec, 2023
The class name attribute can be used by CSS and JavaScript to perform certain tasks for elements with the specified class name. Adding the class name by using JavaScript can be done in many ways.Â
Below are the different approaches that could be used to add a class name to the element:
This property is used to add a class name to the selected element.
Syntax:
// It is used to set the className property.
element.className = "newClass";
// It is used to return the className property.
element.className;
Property Value:
- newClass: It specifies the element’s class name. For applying multiple classes, it needs to separate by space.
Return value: It is of string type which represents the class or list of classes of elements with space-separated.
Example: This example uses the .className property to add a class name.
HTML
<!DOCTYPE html>
<html>
<head>
<title>JavaScript to add class name</title>
<style>
.addCSS {
color: green;
font-size: 25px;
}
</style>
</head>
<body style="text-align:center;">
<h1 style="color:green;">
GeeksforGeeks
</h1>
<p id="p">
A Computer Science portal for Geeks.
</p>
<button onclick="addClass()">
AddClass
</button>
<script>
function addClass() {
let v = document.getElementById("p");
v.className += "addCSS";
}
</script>
</body>
</html>
|
Output:
.className Property
This method is used to add a class name to the selected element.
Syntax:
element.classList.add("newClass");
Example: This example uses .add() method to add the class name.
HTML
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript Adding a class
name to the element
</title>
<style>
.addCSS {
background-color: green;
color: white;
padding: 20px;
font-size: 25px;
}
</style>
</head>
<body style="text-align:center;">
<h1 style="color:green;">
GeeksforGeeks
</h1>
<p id="p">
A Computer Science portal for Geeks.
</p>
<button onclick="addClass()">
AddClass
</button>
<script>
function addClass() {
let elem = document.getElementById("p");
elem.classList.add("addCSS");
}
</script>
</body>
</html>
|
Output:
.add() Method
JavaScript is best known for web page development but it is also used in a variety of non-browser environments. You can learn JavaScript from the ground up by following this JavaScript Tutorial and JavaScript Examples.
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