XML DOM Tutorial
DOM HOMEDOM Introduction
DOM Nodes
DOM Node Tree
DOM Parser
DOM Load Function
DOM Methods
DOM Accessing
DOM Node Info
DOM Node List
DOM Traversing
DOM Browsers
DOM Navigating
Manipulate Nodes
DOM Get ValuesDOM Change Nodes
DOM Remove Nodes
DOM Replace Nodes
DOM Create Nodes
DOM Add Nodes
DOM Clone Nodes
DOM XMLHttpRequest
XML DOM Reference
DOM Node TypesDOM Node
DOM NodeList
DOM NamedNodeMap
DOM Document
DOM DocumentImpl
DOM DocumentType
DOM ProcessingInstr
DOM Element
DOM Attribute
DOM Text
DOM CDATA
DOM Comment
DOM XMLHttpRequest
DOM ParseError Obj
DOM Parser Errors
DOM Summary
XML DOM Examples
DOM ExamplesDOM Validator
XML DOM Node List
A list of nodes is returned by the getElementsByTagName() method and the childNodes property.
Try it Yourself - Examples
The examples below use the XML file
books.xml.
A function, loadXMLDoc(), in an external JavaScript is used to load the XML file.
Get the text
from the first <title> element
This example uses the getElementsByTagName() method to get the text from the
first <title> element in "books.xml".
Loop through
nodes using the length property
This example uses node list and the length property to loop through all <title>
elements in "books.xml"
Get the
attribute of an element
This example uses a attribute list to get attribute from the first <book>
element in "books.xml".
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":
The following code fragment loads "books.xml" into xmlDoc using loadXMLDoc() and 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):
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.
The following code fragment loads "books.xml" into xmlDoc using loadXMLDoc() and returns the number of <title> elements in "books.xml":
x=xmlDoc.getElementsByTagName('title').length;
After the execution of the statement above, x = 4.
The length of the node list can be used to loop through all the elements in the list.
The following code fragment uses the length property to loop through the list of <title> elements:
Example
//the x variable will hold a node list
x=xmlDoc.getElementsByTagName('title');
for (i=0;i<x.length;i++)
{
document.write(x[i].childNodes[0].nodeValue);
document.write("<br />");
}
Output:
Harry Potter
XQuery Kick Start
Learning XML
Try it yourself »
Example explained:
- Load "books.xml" into xmlDoc using loadXMLDoc()
- Set the x variable to hold a node list of all title elements
- Output the value from the text node of all <title> elements
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.
A attribute list keeps itself up-to-date. If an attribute is deleted or added, the list is automatically updated.
The following code fragment loads "books.xml" into xmlDoc using loadXMLDoc() and 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.
The following code fragment displays the value of the "category" attribute, and the number of attributes, of a book:
Example
x=xmlDoc.getElementsByTagName("book")[0].attributes;
document.write(x.getNamedItem("category").nodeValue);
document.write("<br />" + x.length);
Output:
1
Try it yourself »
Example explained:
- Load "books.xml" into xmlDoc using loadXMLDoc()
- Set the x variable to hold a list of all attributes of the first <book> element
- Output the value from the "category" attribute
- Output the length of the attribute list
W3Schools' Online Certification
The perfect solution for professionals who need to balance work, family, and career building.
More than 10 000 certificates already issued!
The HTML Certificate documents your knowledge of HTML.
The CSS Certificate documents your knowledge of advanced CSS.
The JavaScript Certificate documents your knowledge of JavaScript and HTML DOM.
The jQuery Certificate documents your knowledge of jQuery.
The XML Certificate documents your knowledge of XML, XML DOM and XSLT.
The ASP Certificate documents your knowledge of ASP, SQL, and ADO.
The PHP Certificate documents your knowledge of PHP and SQL (MySQL).
| WEB HOSTING |
|---|
| Best Web Hosting |
| PHP MySQL Hosting |
| Best Hosting Coupons |
| UK Reseller Hosting |
| Cloud Hosting |
| Top Web Hosting |
| $7.95/mo SEO Hosting |
| Premium Website Design |
| WEB BUILDING |
|---|
| Download XML Editor |
| FREE Website BUILDER |
| Free Website Templates Free CSS Templates |
| Make Your Own Website |
| W3SCHOOLS EXAMS |
|---|
|
Get Certified in: HTML, CSS, JavaScript, XML, PHP, and ASP |
| W3SCHOOLS BOOKS |
|---|
|
New Books: HTML, CSS JavaScript, and Ajax |
| STATISTICS |
|---|
|
Browser Statistics Browser OS Browser Display |
| SHARE THIS PAGE |
|---|
Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.
While using this site, you agree to have read and accepted our terms of use and privacy policy.
Copyright 1999-2012 by Refsnes Data. All Rights Reserved.