[Dojo-interest] Download file from server progress...

[karozans]

Hi everyone.

I created a RestFUL method using JAX-RS that gets a file to download from
the server to the client.

I need to generate the file from a database dump so sometimes this file can
take a minute or 2 to generate before it is ready to response to the client.

I don't think I can use AJAX to download the file, right?

Is there a way that I can show a DOJO progress bar while the customer is
waiting for their file to download?

Is there a good way to do this?



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[karozans]

Okay thanks. That's what I thought but I was just double checking.

Thanks.



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[mc007]

Hi again,
I just toyed with a PHP stream listener, its definitely possible!

This how it works:
1. tag the download with an id
2. make the download going through PHP/Node.js (see for PHP here:
https://github.com/thephpleague/flysystem/issues/23 : last code)
2. store the stream progress somewhere on the server
3. on the client: long-poll the server for that download id
4. create fake progress bar and update it with your long-poll download
status (that's not smooth)

and to make it smooth:

determine periodically the interpolate factor for the progress bar, you will
need a few samples (download-status) to determine the speed. that's very
similar to calculating estimated positions of players in networked games.

never say never







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