Quick Reference
The NodeList forEach() method executes a callback function for each node in a NodeList, which is an array-like list of Node Objects.
Note
A node can be an HTML element (div, span, p, h2, etc.), or it can be a text node (plain text, white space, a teb, a linebreak). Whereas, when referring just to an element, only the HTML elements are relevant.
<!-- html element to place output -->
<p id="my_output"></p>// variables
let my_list = document.body.childNodes;
let my_text = '';
// loop through nodes
my_list.forEach(
function(node, index) {
my_text += index + ' ' + node + '<br>';
}
);
// output to the HTML element
document.getElementById('my_output').innerHTML = my_text;Output
0 [object Text]
1 [object Comment]
2 [object Text]
3 [object HTMLParagraphElement]Note
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.
Syntax
nodelist.forEach(function(currentValue, index, arr), thisValue)Parameters
| Parameter | Return Types |
|---|---|
| function | A function to run for each node (required) |
| currentValue | The value of the current node (required) |
| index | The index of the current node |
| arr | The NodeList of the current node |
| thisValue | A value passed to the function as its "this" value (default is undefined) |
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)
We’d like to acknowledge that we learned a great deal of our coding from W3Schools and TutorialsPoint, borrowing heavily from their teaching process and excellent code examples. We highly recommend both sites to deepen your experience, and further your coding journey. We’re just hitting the basics here at 1SMARTchicken.