-
XML Tutorial
- XML HOME
- XML Introduction
- XML How to use
- XML Tree
- XML Syntax
- XML Elements
- XML Attributes
- XML Namespaces
- XML Display
- XML HttpRequest
- XML Parser
- XML DOM
- XML XPath
- XML XSLT
- XML XQuery
- XML XLink
- XML Validator
- XML DTD
- XML Schema
- XML Server
- XML Quiz
- XML Certificate
XML AJAX
- AJAX Introduction
- AJAX XMLHttp
- AJAX Request
- AJAX Response
- AJAX XML File
- AJAX PHP
- AJAX ASP
- AJAX Database
- AJAX Applications
- AJAX Examples
XML DOM
- DOM Introduction
- DOM Nodes
- DOM Accessing
- DOM Node Info
- DOM Node List
- DOM Traversing
- DOM Navigating
- DOM Get Values
- DOM Change Nodes
- DOM Remove Nodes
- DOM Replace Nodes
- DOM Create Nodes
- DOM Add Nodes
- DOM Clone Nodes
XPath Tutorial
XSLT Tutorial
- XSLT Introduction
- XSL Languages
- XSLT Transform
- XSLT <template>
- XSLT <value-of>
- XSLT <for-each>
- XSLT <sort>
- XSLT <if>
- XSLT <choose>
- XSLT Apply
- XSLT on the Client
- XSLT on the Server
- XSLT Edit XML
- XSLT Examples
XQuery Tutorial
- XQuery Introduction
- XQuery Example
- XQuery FLWOR
- XQuery HTML
- XQuery Terms
- XQuery Syntax
- XQuery Add
- XQuery Select
- XQuery Functions
XML DTD
- DTD Introduction
- DTD Building Blocks
- DTD Elements
- DTD Attributes
- DTD Elements vs Attr
- DTD Entities
- DTD Examples
XSD Schema
- XSD Introduction
- XSD How To
- XSD <schema>
- XSD Elements
- XSD Attributes
- XSD Restrictions
- XSD Complex Elements
- XSD Empty
- XSD Elements-only
- XSD Text-only
- XSD Mixed
- XSD Indicators
- XSD <any>
- XSD <anyAttribute>
- XSD Substitution
- XSD Example
XSD Data Types
Web Services
References
XML DOM - Node List and NamedNodeMap
A list of nodes is returned by the getElementsByTagName() method and the childNodes property
DOM Node List
When using properties or methods like childNodes or getElementsByTagName(), a node list object is returned.
A node list object represents a list of nodes, in the same order as in the XML.
Nodes in the node list are accessed with index numbers starting from 0.
The following image represents a node list of the <title> elements in books.xml:
Suppose "books.xml" is loaded into the variable xmlDoc.
This code fragment returns a node list of title elements in "books.xml":
x = xmlDoc.getElementsByTagName("title");
After the execution of the statement above, x is a node list object.
The following code fragment returns the text from the first <title> element in the node list (x):
Example
var txt = x[0].childNodes[0].nodeValue;
After the execution of the statement above, txt = "Everyday Italian".
Node List Length
A node list object keeps itself up-to-date. If an element is deleted or added, the list is automatically updated.
The length property of a node list is the number of nodes in the list.
This code fragment returns the number of <title> elements in "books.xml":
x = xmlDoc.getElementsByTagName('title').length;
After the execution of the statement above, the value of x will be 4.
The length of the node list can be used to loop through all the elements in the list.
This code fragment uses the length property to loop through the list of <title> elements:
Example
x = xmlDoc.getElementsByTagName('title');
xLen = x.length;
for (i = 0; i <xLen; i++) {
txt += x[i].childNodes[0].nodeValue) + " ";
}
Output:
Everyday Italian
Harry Potter
XQuery Kick Start
Learning XML
Example explained:
DOM Attribute List (Named Node Map)
The attributes property of an element node returns a list of attribute nodes.
This is called a named node map, and is similar to a node list, except for some differences in methods and properties.
An attribute list keeps itself up-to-date. If an attribute is deleted or added, the list is automatically updated.
This code fragment returns a list of attribute nodes from the first <book> element in "books.xml":
x = xmlDoc.getElementsByTagName('book')[0].attributes;
After the execution of the code above, x.length is the number of attributes and x.getNamedItem() can be used to return an attribute node.
This code fragment gets the value of the "category" attribute, and the number of attributes, of a book:
Example
x = xmlDoc.getElementsByTagName("book")[0].attributes;
txt = x.getNamedItem("category").nodeValue + " " + x.length;
Output:
cooking
1
Example explained: