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Showing content from https://webplatform.github.io/docs/dom/DOMTokenList/contains below:

contains · WebPlatform Docs

contains Summary

Tests if a token is part of a DOMTokenList.

Method of dom/DOMTokenList dom/DOMTokenList

Syntax

var tokenExists = tokenList.contains(token);

Parameters token

Data-type: String

The requested token.

Return Value

Returns an object of type BooleanBoolean

Whether the given token exists in the list. Returns true if the token is present; false otherwise.

Examples


function elHasClass(elid, cls) {
  var classes = document.getElementById(elid).classList;
  if (classes.contains(cls))
    return true;
  else
    return false;
}

Notes

Throws a SyntaxError exception if token is empty.

Throws an InvalidCharacterError exception if token contains any spaces.

Related specifications

W3C DOM4: Candidate Recommendation