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  Tutorial: Easy Ajax Programming

Using the new XMLHttpRequest JavaScript object can make your website design take on new and exciting capabilities.

Tutorial Details:

Summary
Use the javascripts on this page and add your own custom functions
Use an XML template to start with, then move to module-based generation if necessary
Make use of XML to pass other values back and forth
The Skinny
Being able to reload parts of a web page is an invaluable addition to the web programmer's toolkit. Adaptive Path1 calls this "Ajax" and promises that websites can be more usable if written with these technologies in mind.
Of course, any technology can also muck things up. I predict that misdirected applications of Ajax will do more to make sites flashy than to make them useful. But, as always, the potential is there to do it well!2
To start with, many sites are using Ajax to provide a search function that shows results inline. However, there are many other ways this can be used.
Usage
Using the javascripts available on this page, do the following:
1.Include ajax.js and another file with your own custom scripts.
2.Include a cgi_url variable in your custom javascript that points to a server script that will generate your XML (using a database or whatever else you want to use).
3.Write custom functions that handle both the sending and receiving of data. (See examples.) Send the name of your callback function as the 'f' parameter (this JavaScript function will be called when your data is received back from the server).
Conclusion
I recommend starting with simple values and branching out into more complex data structures only when necessary. Make the server do much of the work instead of relying on the client. I like to use HTML templates setup on the server, then fill a
on the client with the full results of a query.


 

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