The contains()
method of the DOMTokenList
interface returns a boolean value — true
if the underlying list contains the given token, otherwise false
.
The contains()
method of the DOMTokenList
interface returns a boolean value — true
if the underlying list contains the given token, otherwise false
.
js
contains(token)
token
A string representing the token you want to check for the existence of in the list.
A boolean value, which is true
if the calling list contains token
, otherwise false
.
In the following example we retrieve the list of classes set on a <span>
element as a DOMTokenList
using Element.classList
. We then test for the existence of "c"
in the list, and write the result into the <span>
's Node.textContent
.
First, the HTML:
html
<span class="a b c"></span>
Now the JavaScript:
js
const span = document.querySelector("span"); span.textContent = span.classList.contains("c") ? "The classList contains 'c'" : "The classList does not contain 'c'";
The output looks like this:
Specification |
---|
DOM Standard # ref-for-dom-domtokenlist-contains① |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
contains |
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/contains