Access javabean from javascript

Hi all,
I have learned this code to generate a progress bar using javascript. However, whithin javascript, I can only simulate a constant time for the progress bar.
In my web page, when the user click submit....a logic takes place in the back end for sometimes to finish. How do I tight that logic to my javascript to retrieve real time?
Thank you very much for your time and assistance

You have to call code on the server.
See here for an example using Perl. You can use any server-side tech you want.
http://www.ipwebdesign.net/kaelisSpace/useful_serverClientValidation.html

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