Need Help about Progress Bar !

[Irfan Mirza]

Hello Dear,

In my Web Application I have to export Reports to PDF for printing purpose.
This task takes long time. And I want to have a progress bar that will show the current progress of exporting to PDF.

Can Any Body help me implementing that progress bar
Thanks
Irfan Mirza

[graviton]

webapplication?
are you using a swing frontend or shall teh progressbar be written in javascript?

[Irfan Mirza]

Mr. Graviton

it should be better to have that progress bar in javascript. Any how if not possible than i will not hesitate using swing frontend just to display that progress bar.

Thanks
Irfan Mirza

[graviton]

ok. when you generate a pdf, this is done in a servlet, i guess.
so you have to think about 2 things:
1. how can you determine the progress?
if you use a pdf api, you will have to find out, how you can determine the progress.
2. how can you update a website / a websites progressbar with data from the server
for this, you have multiple choices:
- use ajax, a javascript framework, that can connect to a java server method via xml (soap) and make queries every minute about the progress
- use a frame or another reloadable object in html and let it refresh every second with the url of a servlet that knows the progress.

you see, in both cases it's not that easy.
perhaps you first should think about getting the progress information from the pdf generator.

[Irfan Mirza]

Well Graviton, thanks for showing me the right direction. I am sure you are aware of concept of "Indeterminate" progress bar where we dont need exact statistics of a task.
I want to create that sort of thing for my application. I don't know much about implementation issues( how to do .) for this progress bar. Of the two ways you told, I want to use second way (refreshing frames). Can you provide me any implementation guidelines.

Thankx
Irfan Mirza

[graviton]

i understand.
so try to find out something about the server puhsing technology,
eg
http://www.javaworld.com/jw-03-2000/jw-03-pushlet.html
or
http://www.google.de/search?q=java+servlet+push+example
i think the first one is a good guide. but you also will have to learn something about java, servlets, javascript and html.