http://www.omnytex.com/XMLHTTPRequestExample.htm
Note that if a URL you are trying to access isn't in the same domain, then at least on Firefox you will get an access denied exception.
That example shows two things: retrieving a URL and displaying it in a table, and updating the options of a <select> element. I think the later is probably quite applicable.
Obviously you'll want to target some Action rather than an actual URL as I've done, but the process is identical.
Also, I think it is very important to note that you *DO NOT* have to send back XML, contrary to the objects' name! In fact I've found for a great many things your life will be considerably simpler to not send back XML (such as updating a select like in the example). You need to make that determination of course depending on what you are doing. But, XML parsing on the client tends to be a bit on the slow side, so I wouldn't do it unless you have a reason for it being XML. Especially if you can't be sure you won't be returning a huge document.
Then again, in a service-oriented world where "services" tends to be synonymous with "web service", which tends to be synonymous with XML, it's something to think about. Then again, no one said a Web Service has to be XML-based either! :)
-- Frank W. Zammetti Founder and Chief Software Architect Omnytex Technologies http://www.omnytex.com
StÃphane Zuckerman wrote:
I would highly recommend using XmlHttpRequest (aka ajax), which is much more user-friendly, much quicker to use and more flexible than reloading the page each time the user clicks on something.
This is a solution I wasn't aware of... And it would be a really great one, provided I could find a way to use it in my application. Would you happen to have some code examples I could use to understand better how ajax works ? I found some pretty useful stuff here :
http://www.xml.com/pub/a/2005/02/09/xml-http-request.html
and there are other papers available that I haven't had time to read, but none with a J2EE example (or even better, a Struts example)...
Thanks anyway, that was really useful ! I might not be able to use this technology for this project, but I certainly will for another one !
StÃphane
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