6-404 Create Document/View Web Applications with XML

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Create Document/View Web Applications With
XML Dino EspositoWrox Press 6-404
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Agenda

• Documents and views
• XML and ASP
• HTML and XMLDOM
• XML and MFC

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Doc/View Background

• Model-View-Controller architecture
• Foundation of SmallTalk 25 yrs ago
• MFC Doc/View model simplification
• Separation between data and presentation

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XML And XSL

• Two distinct files Data and presentation
• XSL applies transformations to XML data
• XSL knows about the XML code structure

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Doc-View On The Web
Win32 - MFC
IE 5.0
XSL
XSL
XSL
CView
CView
CView
XML Data
CDocument
HTML Page
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Three Scenarios For XML/XSL

• Different stylesheets via ASP
• Different stylesheets via XMLDOM and Dynamic HTML
  
• Different stylesheets via MFC classes

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Agenda

• Documents and views
• XML and ASP
• HTML and XMLDOM
• XML and MFC

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XSL Selection Via ASP

• Frame-based page
• Surrounding graphics and controls
• An ltIFRAMEgt window gets the XML text through an
  ASP page

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Ex. 1 Web Doc-View
Stylesheets
ltIFRAME srccontent.asp?XSLgt
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Using ASP Trade-Offs

• Easy to design and code
• Everything happens on the server
• Serious overhead
• XML data is continuously downloaded
• Each representation requires a new page with the
  same data

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Agenda

• Documents and views
• XML and ASP
• HTML and XMLDOM
• XML and MFC

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Using Data-Islands

• The HTML page embeds the XML code to display
• The ltxmlgt tag in IE5.0
• Retrieve the data-island text through the
  Dynamic HTML DOM
• Apply the necessary transformation on the client

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Whats A Data-Island?
lthtmlgt ltbodygt ltxml idMyDatagt lt Enter ASP
code to produce XML data gt lt/xmlgt lt!-- Rest
of the page --gt lt/bodygt lt/htmlgt

• The ltxmlgt tag supports the src attribute
• ltxmlgt is IE50-specific
• Use DHTML

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Ex. 2 Using XMLDOM
Stylesheets
ltDIVgt filled at runtime via XMLDOM
transformations
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Using XMLDOM
Request for Page.asp
Web Server
Browser (IE 5.0)
HTML page with embedded XML code
Instantiate XMLDOM, convert to HTML and
use Dynamic HTML to display the final code
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Using XMLDOM Trade-Offs

• Browser-dependent
• Everything takes place on the client
• XML data downloads only once
• Only additional XSLs download
• DHTML script code on the client

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Agenda

• Documents and views
• XML and ASP
• HTML and XMLDOM
• XML and MFC

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Using MFC And CHtmlView

• A MFC application using CHtmlView
• Internet Explorer 5.0 gives you automatic
  support for XML and XSL
• Force WebBrowser to display XML
• Use temp files
• Everything takes place locally

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Ex. 3 Using CHtmlView
Load OLE DB data and convert to XML
Stylesheets
WebBrowser displays a temporary XML file
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Using MFC Trade-Offs

• A familiar programming model
• WebBrowser (IE 5.0) dependent
• Everything takes place on the client
• Take advantage of XML support in SQL Server 2000

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