HTML DOM Node Information
The nodeName, nodeValue, and nodeType properties contain
information about nodes.
Node Properties
In the HTML DOM, each node is an object.
Objects have methods and properties that can be accessed and manipulated by JavaScript.
Three important node properties are:
- nodeName
- nodeValue
- nodeType
The nodeName Property
The nodeName property specifies the name of a node.
- nodeName is read-only
- nodeName of an element node is the same as the tag name
- nodeName of an attribute node is the attribute name
- nodeName of a text node is always #text
- nodeName of the document node is always #document
Note: nodeName always contains the uppercase tag name of an HTML
element.
The nodeValue Property
The nodeValue property specifies the value of a node.
- nodeValue for element nodes is undefined
- nodeValue for text nodes is the text itself
- nodeValue for attribute nodes is the attribute value
Get the Value of an Element
The following example retrieves the text node value of the <p id="dir">
tag:
Example
<html>
<body>
<p id="intro">Hello World!</p>
<script type="text/javascript">
x=document.getElementById("intro");
document.write(x.firstChild.nodeValue);
</script>
<html>
<body> |
|
The nodeType Property
The nodeType property returns the type of node. nodeType is read only.
The most important node types are:
| Element type |
NodeType |
| Element |
1 |
| Attribute |
2 |
| Text |
3 |
| Comment |
8 |
| Document |
9 |
| 
