The contains()
method of the DOMTokenList
interface returns a Boolean
— true
if the underlying list contains the given token
, otherwise false
.
Syntax
tokenList.contains(token);
Parameters
token
- A
DOMString
representing the token you want to check for the existance of in the list.
Return value
A Boolean
, which is true
if the calling list contains token
, otherwise false
.
Examples
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:
<span class="a b c"></span>
Now the JavaScript:
let span = document.querySelector("span"); let classes = span.classList; let result = classes.contains("c"); if (result) { span.textContent = "The classList contains 'c'"; } else { span.textContent = "The classList does not contain 'c'"; }
The output looks like this:
Specifications
Specification | Status | Comment |
---|---|---|
DOM The definition of 'contains()' in that specification. |
Living Standard | Initial definition |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
contains | Chrome Full support 1 | Edge Full support 12 | Firefox Full support Yes | IE Full support 10 | Opera Full support Yes | Safari Full support 5.1 | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support Yes | Opera Android Full support Yes | Safari iOS Full support 5.1 | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support