XML Document Object Model. - English version -

Size: px

Start display at page:

Download "XML Document Object Model. - English version -"

Collin Nichols
5 years ago
Views:

1 XML Document Object Model - English version -

2 The Document Object Model A programming interface for HTML and XML documents. It defines the way a document can be accessed and manipulated. Using a DOM, a programmer can create a document, navigate its structure, and add, modify, or delete its elements. The W3C DOM has been designed to be used with any programming language. It provides a standard programming interface that can be used in a wide variety of environments and applications.

3 The Node Interface XML parser can be used to load an XML document into the memory of your compute Information can be retrieved and manipulated by accessing the Document Object Model (DOM) The DOM represents a tree view of the XML document The documentelement is the top-level of the tree This element has one or many childnodes that represent the branches of the tree A Node Interface is used to read and write (or access if you like) the individual elements in the XML node tree The childnodes property of the documentelement can be accesses with a for/each construct to enumerate each individual node

4 XML DOM Parser: language-neutral programming model Supports JavaScript, VBScript, Perl, VB, Java, C++ and more Supports W3C XML 1.0 and XML DOM Supports DTD and validation

5 JavaScript in IE 5.0 var xmldoc = new ActiveXObject("Microsoft.XMLDOM") VBScript set xmldoc = CreateObject("Microsoft.XMLDOM") ASP set xmldoc = Server.CreateObject("Microsoft.XMLDOM")

6 Loading an XML file into the parser <script language="javascript"> var xmldoc = new ActiveXObject("Microsoft.XMLDOM") xmldoc.async="false" xmldoc.load("note.xml") //... processing the document goes here </script>

7 Loading pure XML text into the parser <script language="javascript"> var text="<note> text=text+"<to>tove</to><from>jani</from> text=text+"<heading>reminder</heading> text=text+"<body>don't forget me this weekend!</body>" text=text+"</note>" var xmldoc = new ActiveXObject("Microsoft.XMLDOM") xmldoc.async="false" xmldoc.loadxml(text) //... processing the document goes here </script>

8 The parseerror Object var xmldoc = new ActiveXObject("Microsoft.XMLDOM") xmldoc.async="false" xmldoc.load("ksdjf.xml") document.write("<br>error Code: ") document.write(xmldoc.parseerror.errorcode) document.write("<br>error Reason: ") document.write(xmldoc.parseerror.reason) document.write("<br>error Line: ") document.write(xmldoc.parseerror.line)

9 XML Error var xmldoc = new ActiveXObject("Microsoft.XMLDOM") xmldoc.async="false" xmldoc.load("note_error.xml") document.write("<br>error Code: ") document.write(xmldoc.parseerror.errorcode) document.write("<br>error Reason: ") document.write(xmldoc.parseerror.reason) document.write("<br>error Line: ") document.write(xmldoc.parseerror.line)

10 The parseerror Properties errorcode Reason Line linepos srctext url filepos Returns a long integer error code Returns a string explaining the reason for the error Returns a long integer representing the line number for the error Returns a long integer representing the line position for the error Returns a string containing the line that caused the error Returns the url pointing the loaded document Returns a long integer file position of the error

11 Traversing the node tree set xmldoc=createobject("microsoft.xmldom") xmldoc.async="false" xmldoc.load("note.xml") for each x in xmldoc.documentelement.childnodes document.write(x.nodename) document.write(": ") document.write(x.text) next

12 Providing HTML content from XML files XML can separate HTML documents from their data var xmldoc = new ActiveXObject("Microsoft.XMLDOM") xmldoc.async="false" xmldoc.load("note.xml") nodes = xmldoc.documentelement.childnodes to.innertext = nodes.item(0).text from.innertext = nodes.item(1).text header.innertext = nodes.item(2).text body.innertext = nodes.item(3).text

13 Accessing XML elements by name var xmldoc = new ActiveXObject("Microsoft.XMLDOM") xmldoc.async="false xmldoc.load("note.xml") document.write(xmldoc.getelementsbytagname("from").item(0).text)

INTERNET & WEB APPLICATION DEVELOPMENT SWE 444. Fall Semester (081) Module 4 (VII): XML DOM

INTERNET & WEB APPLICATION DEVELOPMENT SWE 444 Fall Semester 2008-2009 (081) Module 4 (VII): XML DOM Dr. El-Sayed El-Alfy Computer Science Department King Fahd University of Petroleum and Minerals alfy@kfupm.edu.sa