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Table of contents
XML DOM Tutorial
DOM Introduction
DOM Nodes
DOM Node Tree
DOM Parsing
DOM Load Function
DOM Methods
DOM Accessing
DOM Node Info
DOM Node List
DOM Traversing
DOM Browsers
DOM Navigating

Manipulate Nodes
DOM Get Values
DOM Change Nodes
DOM Remove Nodes
DOM Replace Nodes
DOM Create Nodes
DOM Add Nodes
DOM Clone Nodes
DOM HttpRequest

XML DOM Reference
DOM Node Types
DOM Node
DOM NodeList
DOM NamedNodeMap
DOM Document
DOM DocumentImpl
DOM DocumentType
DOM ProcessingInstr
DOM Element
DOM Attribute
DOM Text
DOM Comment
DOM HttpRequest
DOM ParseError Obj
DOM Parser Errors

DOM Summary

DOM Examples
DOM Validator

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XML DOM Load Function

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The code for loading XML documents can be stored in a function.

The function described below, is used in all examples in this tutorial.

An XML Load Function - loadXMLDoc()

The XML DOM contains methods (functions) to traverse XML trees, access, insert, and delete nodes.

However, before an XML document can be accessed and manipulated, it must be loaded into an XML DOM object.

The previous chapter demonstrated how to load XML documents. To make it simpler to maintain this code, it should be written as a function:

function loadXMLDoc(dname) 
try //Internet Explorer
  xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
  try //Firefox, Mozilla, Opera, etc.
  catch(e) {alert(e.message)}
catch(e) {alert(e.message)}

The function above can be stored in the <head> section of an HTML page, and called from a script in the page.

Try it yourself

An External Load Function

To make the function above even easier to maintain, and to make sure the same code is used in all pages, it can be stored in an external file.

We have called the file "loadxmldoc.js"

The file can be loaded in the <head> section of an HTML page, and loadXMLDoc() can be called from a script in the page:

<script type="text/javascript" src="loadxmldoc.js"> 

<script type="text/javascript">
document.write("xmlDoc is loaded, ready for use");

Try it yourself

lamp The function described above, is used in all examples in this tutorial

An XML Load Function - loadXMLString()

A similar function can be used to load an XML string (instead an XML file):

function loadXMLString(txt) 
try //Internet Explorer
  xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
  try //Firefox, Mozilla, Opera, etc.
    parser=new DOMParser();
  catch(e) {alert(e.message)}

To make the function above easier to maintain, and to make sure the same code is used in all pages, it can be stored in an external file.

We have stored in in a file called "loadxmlstring.js".

Try it yourself

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