The read-only length
property of the DOMTokenList
interface is an integer
representing the number of objects stored in the object.
The read-only length
property of the DOMTokenList
interface is an integer
representing the number of objects stored in the object.
An positive integer, or 0
if the list is empty.
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:
html
<span class="a b c"></span>
Now the JavaScript:
js
const span = document.querySelector("span"); const classes = span.classList; const length = classes.length; span.textContent = `classList length = ${length}`;
The output looks like this:
Specification |
---|
DOM Standard # ref-for-dom-domtokenlist-length① |
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