XML DOM Node Information

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XML DOM Node Information
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The nodeName, nodeValue, and nodeType properties contain information about nodes.

– Examples
The examples below use the XML file books.xml.

Get the node name of an element node
This example uses the nodeName property to get the node name of the root element in “books.xml”.

Get the text from a text node
This example uses the nodeValue property to get the text of the first element in “books.xml”.

Change the text in a text node
This example uses the nodeValue property to change the text of the first element in “books.xml”.

Get the node name and type of an element node
This example uses the nodeName and nodeType property to get node name and type of the root element in “books.xml”.

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Node Properties
In the XML 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
.

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 code retrieves the text node value of the first element:

Example
var x = xmlDoc.getElementsByTagName(“title”)[0].childNodes[0];
var txt = x.nodeValue;
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Result:  txt = “Everyday Italian”

Example explained:

Suppose you have loaded “books.xml” into xmlDoc
Get text node of the first element node
Set the txt variable to be the value of the text node
Change the Value of an Element
The following code changes the text node value of the first element:

Example
var x = xmlDoc.getElementsByTagName(“title”)[0].childNodes[0];
x.nodeValue = “Easy Cooking”;
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Example explained:

Suppose you have loaded “books.xml” into xmlDoc
Get text node of the first element node
Change the value of the text node to “Easy Cooking”
The nodeType Property
The nodeType property specifies the type of node.

nodeType is read only.

The most important node types are:

Node type NodeType
Element 1
Attribute 2
Text 3
Comment 8
Document 9
.

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