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Showing content from https://webplatform.github.io/docs/dom/Node/nodeValue below:

nodeValue · WebPlatform Docs

nodeValue Summary

Gets or sets the value of a Node, if the type of Node supports it.

Syntax

var value = node.nodeValue;
node.nodeValue = newValue;

Return Value

Returns an object of type StringString

The value of the node.

Examples

The following code example alters the text of the specified list item by setting the nodeValue property of the text node that is contained by that list item.

<!DOCTYPE html>
<html>
<head>
<title>Title</title>
<script>
function changeValue(list, itemIndex, newValue) {
   
   if (list.nodeName !== "UL" && list.nodeName != "OL")
      return false;
   
   
   if (itemIndex > list.childNodes.length -1)
      return false;
   
   var liElements = list.childNodes[itemIndex];
   if (!liElements)
      return false;
   
   var textNode = liElements.childNodes[0];
   
   if (textNode.nodeType !== 3)
      return false;
   textNode.nodeValue = newValue;
   return true;
}
function initialize() {
  document.getElementById("list").addEventListener(
    "click",
    function () {
     changeValue(this, 0, "New Node value");
    },
    false);
}
document.addEventListener("DOMContentLoaded", initialize, false);
</script>
</head>
<body>
<ul id="list"><li>Old Node Value</li></ul>
</body>

Usage

 Use this property to get or set the value of a Node. The concept of nodeValue changes between the various Node types (Element, Text and the rest).

Notes

The value of this property for Text nodes is their Text.textContent.
This property is deprecated for Attr nodes. Use Attr.value instead. The value of this property for Attr nodes is their Attr.value.
The value of this property for Element nodes is always null. Use Node.nodeName to get their name or dom/Node/textContent to get all of the text included in their tree.

Related specifications

DOM Level 3 Core: W3C Recommendation
WHATWG DOM: Living Standard

Attributions

Mozilla Developer Network : [Node.nodeValue Article]
Microsoft Developer Network: [nodeValue Property Article]

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