Web/API/DOMTokenList/length

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
DOMThe 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.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
length	Chrome Full support 8	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 3	Chrome Android Full support 18	Firefox Android Full support 50	Opera Android Full support Yes	Safari iOS Full support 5.1	Samsung Internet Android Full support 1.0

Legend

Full support  

Full support

DOMTokenList.length by Mozilla Contributors is licensed under CC-BY-SA 2.5.