DOMTokenList.toggle

The toggle() method of the DOMTokenList interface removes a given token from the list and returns false. If token doesn't exist it's added and the function returns true.

Syntax

tokenList.toggle(token, force);

Parameters

token

A DOMString representing the token you want to toggle.

force Optional

A Boolean that, if included, turns the toggle into a one way-only operation. If set to false, the token will only be removed but not added again. If set to true, the token will only be added but not removed again.

Return value

A Boolean — false if the token is not in the list after the call, or true if the token is in the list after the call.

Examples

In the following example we retrieve the list of classes set on a <span> element as a DOMTokenList using Element.classList. We then replace a token in the list, and write the list into the <span>'s Node.textContent.

First, the HTML:

<span class="a b">classList is 'a b'</span>

Now the JavaScript:

var span = document.querySelector("span");
var classes = span.classList;
span.onclick = function() {
  var result = classes.toggle("c");
  if(result) {
    span.textContent = "'c' added; classList is now '" + classes + "'.";
  } else {
    span.textContent = "'c' removed; classList is now '" + classes + "'.";
  }
}

The output looks like this:

Specifications

Browser compatibility