The className
property of the Element
interface gets and sets the value of the class
attribute of the specified element.
Syntax
var cName = elementNodeReference.className; elementNodeReference.className = cName;
cName
is a string variable representing the class or space-separated classes of the current element.
Example
let el = document.getElementById('item');
if (el.className === 'active'){
el.className = 'inactive';
} else {
el.className = 'active';
}
Notes
The name className
is used for this property instead of class
because of conflicts with the "class" keyword in many languages which are used to manipulate the DOM.
className
can also be an instance of SVGAnimatedString
if the element
is an SVGElement
. It is better to get/set the className
of an element using Element.getAttribute
and Element.setAttribute
if you are dealing with SVG elements. However, take into account that Element.getAttribute
returns null
instead of ""
if the element
has an empty class
attribute.
elm.setAttribute('class', elm.getAttribute('class'))
The class
is an HTML Attribute, while the className
is a DOM Property.
Specifications
Specification | Status | Comment |
DOMThe definition of 'element.className' in that specification. | Living Standard | |
DOM4The definition of 'element.className' in that specification. | Obsolete | |
Document Object Model (DOM) Level 2 HTML SpecificationThe definition of 'element.className' in that specification. | Obsolete | Initial definition |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
className
|
Chrome
Full support 43 |
Edge
Full support 12 |
Firefox
Full support 1 |
IE
Full support 8 |
Opera
Full support 8 |
Safari
Full support 6 |
WebView Android
Full support 43 |
Chrome Android
Full support 43 |
Firefox Android
Full support 4 |
Opera Android
Full support 10.1 |
Safari iOS
Full support 6 |
Samsung Internet Android
Full support 4.0 |
Legend
- Full support
- Full support
See also
Element.className by Mozilla Contributors is licensed under CC-BY-SA 2.5.