DOMTokenList: length property
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The read-only length
property of the DOMTokenList
interface is an integer
representing the number
of objects stored in the object.
Value
An positive integer, or 0
if the list is empty.
Examples
In the following example we retrieve the list of classes set on a
<span>
element as a DOMTokenList
using
Element.classList
, then write the length of the list to the
<span>
's Node.textContent
.
First, the HTML:
html
<span class="a b c"></span>
Now the JavaScript:
js
const span = document.querySelector("span");
const classes = span.classList;
const length = classes.length;
span.textContent = `classList length = ${length}`;
The output looks like this:
Specifications
Specification |
---|
DOM # ref-for-dom-domtokenlist-length① |
Browser compatibility
Report problems with this compatibility data on GitHubdesktop | mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
length |
Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
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.