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

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