XML Developer Tip
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Manage user input with XForms
That said, some understanding of how XForms actually works is probably worth providing. A simple bulleted list is all that it takes to tick off the high points:
- XForms works in concert with XPath to navigate XML source documents
- XForms also works in concert with XSLT to process forms processing and related instructions
- XForms includes markup to manage both large and small amounts of input (<input> and <textarea>), to control entry of confidential or private data (<secret>), to manage display of document contents (aka "instance data"; <output>), to handle value selections from a range of inputs (<range>), to upload files or device data (<upload>), to incorporate form events (<trigger>), to submit form data for server-side processing (<submit>), and to select values from a set of one or more legal options (<select1> and <select>).
- XForms also supports a variety of input modes, to support all kinds of user input, not just from the keyboard but also from telephone keypads or other input devices.
- XForms uses the XML event model to manage user interaction (for more information on this fascinating subject, see the XML Events page at www.w3.org/TR/xml-events/). These permit managing user focus, display of user messages, navigating within existing or new windows, changing instance data, forcing recalculation, revalidation, or screen refreshes, partial or complete submission of input data, and other display management functions.
When all these facilities are combined, content developers have direct access to all the functions that typically required scripting in the more limited HTML implementation.
This new outlook on managing user input and interaction in XML documents promises to make it much easier and more straightforward for content developers to build and manage dynamic XML documents. Even better, this approach promises to reduce if not eliminate the browser dependencies that have plagued earlier HTML-based implementations—as soon as the majority of Web browsers become fully XML-enabled that is. In the meantime, it's worth taking the time to get to know and learn how to use this powerful new specification, which should help reduce a major cause of Web chaos. Happy XML coding!
For more information on this topic, please check out Micah Dubinko's excellent story "What are XForms" at XML.com at www.xml.com/pub/a/2001/09/05/xforms.html.
About the Author
Ed Tittel is a principal at LANWrights, Inc., a network-oriented writing, training, and consulting firm based in Austin, Texas. He is the creator of the Exam Cram series and has worked on over 30 certification-related books on Microsoft, Novell, and Sun related topics. Ed teaches in the Certified Webmaster Program at Austin Community College and consults. He a member of the NetWorld + Interop faculty, where he specializes in Windows 2000 related courses and presentations.
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