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Progressive Web Page update

Posted on 2004-04-09
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Last Modified: 2010-04-01
Hi there,

I am currently building a site using JSP and I am wondering if there is a convenient way to display updates to users as they happen.

Essentially, some of the processes are computationally intensive (encryption and the like) and I would like to update the user as to where the process is up to. So, rather than - say - 10 different pages for each of the stages, if there were 10 bullet points in a page, I would like to show each one when the relevant Java code returns from its computation. Is it possible to do this? If so, how?

Any help would be really appreciated.

Paul
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Question by:fishpalboy
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Expert Comment

by:anthony_castillon
ID: 10790546
Paul,

Why not set up a flag object (maybe in a class ComputationFlag) that has parameters indicating completion of the various stages in the processing?  Then at the start of the processing, instantiate this class and put the object as a session attribute (using session.setAttribute ("processFlag", myFlagObject)).  

As you open the JSP, check this flag object from the session and see which parameters have been set to complete or "true".

Hope this helps.
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Author Comment

by:fishpalboy
ID: 10790606
The problem with that is that it involves loading the page several times.

Basically what a want to achieve is that the page loads once, as each of the stages completes, the page is updated without being reloaded. That makes it a lot harder, I think.
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Author Comment

by:fishpalboy
ID: 10791080
I have found out how to do it:

You output 256 bytes (if you are using IE) and then whenever you want output to the browser you call out.flush() in your JSP. Lovely.

Paul
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