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
DOM
The definition of 'length' in that specification.
Living Standard Initial definition

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
lengthChrome Full support 8Edge Full support 12Firefox Full support 50IE Full support 10Opera Full support YesSafari Full support 5.1WebView Android Full support 3Chrome Android Full support 18Firefox Android Full support 50Opera Android Full support YesSafari iOS Full support 5.1Samsung Internet Android Full support 1.0

Legend

Full support  
Full support