The read-only length
property of the DOMTokenList
interface is an integer
representing the number of objects stored in the object.
DOMTokenList.length
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:
<span class="a b c"></span>
Now the JavaScript:
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 Standard # ref-for-dom-domtokenlist-length① |
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
length |
8
|
12
|
3.6
|
10
|
≤12.1
|
5.1
|
3
|
18
|
4
|
≤12.1
|
5
|
1.0
|
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https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList/length