I plan to try to add a status callback to the FileUpload package. Here is the scenario I would like to support (I'm making this up as I go, but something like this):
1) User uploads a large file (form target is an invisible IFRAME so that the browser does not leave the form page on submit).
2) The onsubmit handler for the file upload form uses setTimeout to call a "checkStatus" function (in Javascript) in a few seconds.
3) The checkStatus function makes a request in an invisible IFRAME to the server.
4) The server responds with with a message on the status of the file upload.
5) Upon receiving a reply from the server, an onload handler in the IFRAME updates a visible status message on the form.
6) When the upload is complete, the onload handler displays a success message and moves the user to the next page (or displays an error).
To support this scenario, I plan to try and add the following to FileUpload:
1) As FileUpload processes an incoming request, it updates a session attribute associated with the request. I'm assuming in most cases it should be possible to provide a percentage complete status, since the total size is available in the header even before the upload is complete.
2) A status page returned to the invisible IFRAME can check this session attribute and inform the client what FileUpload is doing at the moment.
Anybody thought of doing something similar? Any thoughts on why this wouldn't work? Thanks for any feedback, and unless I hear otherwise I'll take a shot and let you know if/when I come up with something.
Regards,
Karl Goldstein
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