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

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Adds a token to a DOMTokenList if it is not present, or removes it if it is. Returns true if the token is now present (it was added); returns false if it is not (it was removed).

Method of dom/DOMTokenListdom/DOMTokenList

var tokenExists = tokenList.toggle(token, force);

Data-type

String

The token to toggle.

Data-type

Boolean

(Optional)

Whether to force adding or removing the token. See Notes.

Returns an object of type BooleanBoolean

Whether the token exists after the method has executed.

function elTogItem(elid,itemtog) {
  var classes = document.getElementById(elid).classList;
  return classes.toggle(itemtog);
}

function elTogItemForce(elid,itemtog,force) {
  var classes = document.getElementById(elid).classList;
  return classes.toggle(itemtog,force);
}

 Throws a SyntaxError  exception if token is empty.

Throws an InvalidCharacterError exception if token contains any spaces.

If the optional parameter force is not provided, this method removes the token if it is present, or adds the token if it is not present.

If force is true, this method adds the token (functionally equivalent to DOMTokenList.add()). If force is false, this method removes the token (functionally equivalent to DOMTokenList.remove()).

W3C DOM4

Candidate Recommendation

• Microsoft Developer Network: [Windows Internet Explorer API reference Article]

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