Element: classList property
The Element.classList
is a read-only property that
returns a live DOMTokenList
collection of the class
attributes of the element. This can then be used to manipulate the class list.
Using classList
is a convenient alternative to accessing an element's list
of classes as a space-delimited string via element.className
.
Value
A DOMTokenList
representing the contents of the element's
class
attribute. If the class
attribute is not set or empty,
it returns an empty DOMTokenList
, i.e. a DOMTokenList
with
the length
property equal to 0
.
Although the classList
property itself is read-only, you can modify its associated DOMTokenList
using the add()
, remove()
, replace()
, and toggle()
methods.
You can test whether the element contains a given class using the classList.contains()
method.
Examples
js
const div = document.createElement("div");
div.className = "foo";
// our starting state: <div class="foo"></div>
console.log(div.outerHTML);
// use the classList API to remove and add classes
div.classList.remove("foo");
div.classList.add("anotherclass");
// <div class="anotherclass"></div>
console.log(div.outerHTML);
// if visible is set remove it, otherwise add it
div.classList.toggle("visible");
// add/remove visible, depending on test conditional, i less than 10
div.classList.toggle("visible", i < 10);
// false
console.log(div.classList.contains("foo"));
// add or remove multiple classes
div.classList.add("foo", "bar", "baz");
div.classList.remove("foo", "bar", "baz");
// add or remove multiple classes using spread syntax
const cls = ["foo", "bar"];
div.classList.add(...cls);
div.classList.remove(...cls);
// replace class "foo" with class "bar"
div.classList.replace("foo", "bar");
Specifications
Specification |
---|
DOM Standard # ref-for-dom-element-classlist① |
Browser compatibility
BCD tables only load in the browser
See also
element.className
DOMTokenList
classList.js
(a cross-browser JavaScript polyfill that fully implementselement.classList
)