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HTML DOM className Property

HTMLElement Object Reference Element Object

Example

Set the class for a <div> element with id="myDIV":

document.getElementById("myDIV").className = "mystyle";

Try it yourself »

More "Try it Yourself" examples below.


Definition and Usage

The className property sets or returns the class name of an element (the value of an element's class attribute).


Browser Support

Property
className Yes Yes Yes Yes Yes


Syntax

Return the className property:

HTMLElementObject.className

Set the className property:

HTMLElementObject.className=class

Property Values

Value Description
class Specifies the class name of an element. To apply multiple classes, separate them with spaces, like "test demo"

Technical Details

Return Value: A String, representing the class, or a space-separated list of classes, of an element


Examples

More Examples

Example

Get the class name of the first <div> element in the document (if any):

var x = document.getElementsByTagName("DIV")[0].className;

The result of x will be:

mystyle

Try it yourself »

Example

Other examples on how to get the class name of an element:

var x = document.getElementsByClassName("mystyle")[0].className;
var y = document.getElementById("myDIV").className;

Try it yourself »

Example

Get the class names of an element with multiple classes:

<div id="myDIV" class="mystyle test example">I am a DIV element</div>

var x = document.getElementById("myDIV").className;

The result of x will be:

mystyle text example

Try it yourself »

Example

Overwriting an existing class name with a new one:

<div id="myDIV" class="mystyle">I am a DIV element</div>

document.getElementById("myDIV").className = "newClassName";

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Example

To add a class to an element, without overwriting existing values, insert a space and the new class name:

document.getElementById("myDIV").className += " anotherClass";

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Example

If there's a class of "mystyle" in an element with id="myDIV", change its font-size:

var x = document.getElementById("myDIV");

if (x.className === "mystyle") {
    x.style.fontSize = "30px";
}

Try it yourself »


Related Pages

CSS Tutorial: CSS Selectors

CSS Reference: CSS .class Selector

HTML DOM Reference: HTML DOM classList Property

HTML DOM Reference: HTML DOM getElementsByClassName() Method

HTML DOM Reference: HTML DOM Style Object


HTMLElement Object Reference Element Object

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