Jump to content

JAVASCRIPT nodeList/nodeCollection

Recommended Posts


I have a problem when it comes to traversing through DOM nodes and accessing their data(values).

Please have a look at the following code


<!DOCTYPE html>
<title>Page Title</title>
<script src="js.js"></script>
	<div id="div1" class="div1">
		<img src="1.png" style="width:100px;height:100px;"/>
		<h1>This is a Heading1</h1>
		<p>This is a paragraph1.</p>
		<button onclick="a(0);">Press me</button>
	<div id="div1" class="div1">
		<img src="2.jpeg" style="width:100px;height:100px;"/>
		<h1>This is a Heading2</h1>
		<p>This is a paragraph2.</p>
		<button onclick="a(1);">Press me</button>
	<div id="div1" class="div1">
		<img src="3.jpeg" style="width:100px;height:100px;"/>
		<h1>This is a Heading3</h1>
		<p>This is a paragraph3.</p>
		<button onclick="a(2);">Press me</button>


var elements = document.getElementsByClassName("div1");

function a(index)
	var d = elements[index].childNodes[3].nodeValue;

Okay so according to my understanding if I want to access and alert the first div's h1 text value which is "This is Heading1" then my JavaScript code should be

var d = elements[index].childNodes[1].nodeValue;

However I do not get the text value?

Also nodeValue gives me NULL if I use innerHTML I get the text value but at childNodes[3] and not childNodes[1] where you'd expect it to be?

Also this example contradicts everything you find at https://www.w3schools.com/js/js_htmldom_navigation.asp

Can someone please elaborate on this as it is very important to understand and I am tearing my hair out trying to figure this out.


Edited by Iven
Link to post
Share on other sites

Yes! spaces are Text nodes, if you want to be element specific only, use '.children' instead

            function a(index)
                var d = elements[index];
                alert("Children length: " + d.children.length);
                alert("childNodes length " + d.childNodes.length);


Edited by dsonesuk
Link to post
Share on other sites

Both work exactly the same if used correctly, with nodeValue you have to access the parent element text node first using childNode[0] then nodeValue (childNode[0].nodeValue), with .innerHTML its simple needs a reference to parent element in question to add or retrieve text within it.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...