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Add Persistence to Your XML Data Islands-3 : Page 3


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Updating Records
Updating records is easy because you don't need any scripting whatsoever. IE hides all the plumbing involved in using the data island component, it is responsible for keeping the display coordinated with the data. For users, this automatic synchronization makes updating records a snap--just type a new value into any bound data field in the associated form and move off the record. That's it! The bound form field's new data replaces the data in the XML document.Of course, it couldn't be that easy! As you found out in last month's article, at this point, the XML data exists only in memory—not in a persistent store. Therefore, even though users can see their changes to the data by navigating through the record set, reloading the page reveals that nothing has really changed; the data island still contains the original data from the phone.xml file specified by the src attribute of the <xml> element. Because the underlying file remains unchanged, the page always displays the original data. From a developer viewpoint, IE's automatic synchronization between the display and the in-memory copy of the data is not the same as automatic persistance. When you need persistance, you must implement it yourself.


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