The length
read-only property of the DOMTokenList
interface is an integer
representing the number of objects stored in the object.
Syntax
tokenList.length;
Value
An integer
.
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:
<span class="a b c"></span>
Now the JavaScript:
let span = document.querySelector("span"); let classes = span.classList; let length = classes.length; span.textContent = `classList length = ${length}`;
The output looks like this:
Specifications
Specification | Status | Comment |
---|---|---|
DOM The definition of 'length' in that specification. |
Living Standard | 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.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
length | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 50 | IE Full support 10 | Opera Full support Yes | Safari Full support 5.1 | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support 50 | Opera Android Full support Yes | Safari iOS Full support 5.1 | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support