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Nicolas Lehuen
nicolas at lehuen.com
Thu Aug 3 11:35:44 EDT 2006
Alas, the progress bar is very small and un-noticeable, and it doesn't tell the user how much bytes remain to be transferred nor a ETA. This is the reason why so many people want to roll their own upload progress bar. If only the people developing browsers could take a cue about this problem... Well, I guess it's time to file a bug report for Mozilla / Firefox, at least. Nicolas Lehuen 2006/8/3, Mike Looijmans <nlv11281 at natlab.research.philips.com>: > > Most browsers already display a progress bar for uploads. That is the > correct place for these things > anyway. > > But don't underestimate the value that the marketing department attaches > to "eye candy" features. > > > Mike Looijmans > Philips Natlab / Topic Automation > > > Colin Bean wrote: > > Definitely, I should have mentioned that the communication between the > > filter and the handler would be a significant problem in itself. > > Hopefully my initial description was scary enough that nobody tried it > > :P > > > > I can see how an impatient user would think that a file upload wasn't > > "working" if the browser didn't give them any feedback, but hopefully > > anybody uploading very large files to your server can be trusted > > understand the delay, or at least read some instructions that you > > provide for them. > > > > Enough veering off topic; but I think part of the point here is that > > any kind of progress bar like this is limited by the way HTTP file > > uploads work, so this isn't really specific to mod_python. If a > > framework somewhere provides an upload bar (using HTTP / HTML, at > > least), it seems like it would have to use a kludge similar to what I > > described above. Correct me if I'm wrong... > > > > -Colin > > > > > > On 8/2/06, Graham Dumpleton <grahamd at dscpl.com.au> wrote: > > > >> Colin Bean wrote .. > >> > Unfortunately, what you're trying to do is more complicated than > this. > >> > First of all, by the time your handler is called, the file has > >> > already been sent over the network, and your handler is only reading > >> > it from a tempfile on disk. Also, a handler only sends one response > >> > back after running to completion, so your code is behaving as > >> > expected. It finishes processing the file upload (including doing > >> > everything in your loop), and when it's finished it sends a response > >> > back to the client. > >> > > >> > Sorry I can't provide more constructive feedback having never > actually > >> > implemented something like this. To take a guess at it, you'd need > to > >> > use an InputFilter to examine the upload request as it is read (I > >> > believe this phase happens before the tempfile is written to disk), > >> > and this would need to somehow communicate with another mod_python > >> > handler which would return the current upload progress. The client > >> > page wold have to keep polling this handler (with an XMLHttpRequest, > >> > perhaps) and display the results it gets with each poll. Yeah, it's > >> > pretty ugly... > >> > >> Except that a subsequent request to try and monitor progress may in a > >> multi > >> process version of Apache end up at a different process and will not > have > >> access to where the original request is up to. > >> > >> In short, there are many reasons why a progress meter is hard to > >> implement and > >> may not even give a correct indication of what is happening anyway. > >> > >> Personally, I am not sure what the fascination is with them besides > >> the eye > >> candy value of it. > >> > >> Graham > >> > >> > HTH, > >> > Colin > >> > > >> > > >> > On 8/1/06, jadacyrus <jadacyrus at gmail.com> wrote: > >> > > Essentially this is what I have setup for my upload script: > >> > > > >> > > [code] > >> > > > >> > > #HTML Stuff here > >> > > #Declare variables etc... > >> > > > >> > > while bytes_left >= 0: > >> > > fileData = req.form['filename'].file.read(1024) > >> > > filebuffer = filebuffer + fileData > >> > > bytes_left = bytes_left - 1024 > >> > > bytes_read = bytes_read + 1024 > >> > > percent = bytes_read/int(length) * 100 > >> > > > >> > > #Some nested IF statements to display a progress indicator using > >> images > >> > > based on the percent variable. > >> > > > >> > > [/code] > >> > > > >> > > This is contained in my upload.py in the function upFile which is > >> called > >> > > from the POST method. However, It seems that the file uploads > >> completely > >> > > first and then it will show the progress indications afterwards. > >> However > >> > > this doesn't seem to be logically what my code should be doing. I'm > >> > > somewhat new to mod_python but not python in general, any > >> suggestions? > >> > > _______________________________________________ > >> > > Mod_python mailing list > >> > > Mod_python at modpython.org > >> > > http://mailman.modpython.org/mailman/listinfo/mod_python > >> > > > >> > _______________________________________________ > >> > Mod_python mailing list > >> > Mod_python at modpython.org > >> > http://mailman.modpython.org/mailman/listinfo/mod_python > >> > > _______________________________________________ > > Mod_python mailing list > > Mod_python at modpython.org > > http://mailman.modpython.org/mailman/listinfo/mod_python > > > > _______________________________________________ > Mod_python mailing list > Mod_python at modpython.org > http://mailman.modpython.org/mailman/listinfo/mod_python > -------------- next part -------------- An HTML attachment was scrubbed... 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