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DOMTokenList: forEach() method

The forEach() method of the DOMTokenList interface calls the callback given in parameter once for each value pair in the list, in insertion order.

Syntax

js

forEach(callback)
forEach(callback, thisArg)

Parameters

callback

The function to execute for each element, eventually taking three arguments:

currentValue

The current element being processed in the array.

currentIndex

The index of the current element being processed in the array.

listObj

The array that forEach() is being applied to.

thisArg Optional

The value to use as this when executing callback.

Return value

None.

Example

In the following example we retrieve the list of classes set on a <pre> element as a DOMTokenList using Element.classList. We when retrieve an iterator containing the values using forEach(), writing each one to the <pre>'s Node.textContent inside the forEach() inner function.

HTML

html

<pre class="a b c"></pre>

JavaScript

js

const pre = document.querySelector("pre");
const classes = pre.classList;
const iterator = classes.values();

classes.forEach(function (value, key, listObj) {
  pre.textContent += `(${value}${key})/${this}\n`;
}, "arg");

Result

Specifications

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Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
forEach 42 16 50 No 29 10.1 42 42 50 29 10.3 4.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList/forEach