- Tags: JS DOM, JS DOMTokenList
- Categories: JavaScript Methods, JavaScript Reference, Reference
Quick Reference
The DOMTokenList forEach() method executes a callback function for each token in a DOMTokenList, which is a set of space-separated tokens that can be accessed by index.
<!-- html element to place output -->
<p id="my_output" class="class1 class2 class3"></p>
// variables
let my_classes = document.getElementById('my_output').classList;
let my_list = '';
// loop through the tokens
my_classes.forEach(
function(token, index) {
my_list += 'Token ' + index + ': ' + token + '<br>';
}
);
// output to the HTML element
document.getElementById('my_output').innerHTML = my_list;
Output
Token 0: class1
Token 1: class2
Token 2: class3
Syntax
nodelist.forEach(function(currentValue, index, arr), thisValue)
Parameters
| Parameter | Return Types |
|---|---|
| function | A function to run for each token (required) |
| currentValue | The value of the current token (required) |
| index | The index of the current token |
| arr | The NodeList of the current token |
| thisValue | A value passed to the function as its "this" value (default is undefined) |
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JAVASCRIPT NOTES:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
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