DOMTokenList: contains() method
The contains() method of the DOMTokenList interface
returns a boolean value — true if the underlying list contains the given token,
otherwise false.
Syntax
js
contains(token)
Parameters
token-
A string representing the token you want to check for the existence of in the list.
Return value
A boolean value, 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:
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:
Specifications
| Specification |
|---|
| DOM Standard # ref-for-dom-domtokenlist-contains① |
Browser compatibility
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