[reportlab-users] Clearing display page

David H bluepaul at earthlink.net
Sun Aug 27 19:34:40 EDT 2006

Robin Becker wrote:

> David H wrote:
>> Hi ReportLab List,
>> I have an Zope application that uses ReportLab to generate acrobat 
>> viewable reports.
>> Heres the problem:
>> I display an acrobat report (Firefox or IE 6) and say scroll down to 
>> page 10.  I then use the <browser> back button to re-enter my Zope 
>> application.
>> Now, even if my users click various pages and then return to the 
>> Report (which is always freshly generated) it will try to re-display 
>> at page 10 - instead of top of page.  This occurs even if the data 
>> being rewported has changed.  This occurs even if a different report 
>> is generated!
>> Note: that I use
>> import tempfile and
>> tmpFile2 = tempfile.mktemp() to keep pdfPath's unique.
>> Anyway around this or suggestions?
>> Thanks for any help,
>> David H
>> I'm using ReportLab 1.20, Zope 2.78 and an external python script + 
>> ReportLab to generate the PDFs.  The Server is Linux Ubuntu 5.10.
> .....
> Though I suspect this is more to do with the client than the server 
> there's one thing you might check. Try randomising the URL that's used 
> on the server. Instead of thing.pdf try thing.pdf?random=12345 where 
> 12345 should be a random number. That might inhibit the client caching 
> anything. Alternatively persuade zope to puch all the right headers to 
> force the client to belive the content is fresh each time. We do this 
> sort of thing a lot, but the content url is almost always fairly 
> random ie contains a date + some random string.

Your suggestion was interesting and I tried it.  But no joy.  I've tried 
some other stuff (messing with content-disposition, etc) and nothing is 
working.  Fortunetely, this problem isn't a "show stopper" but it is an 
annoyance.  Maybe its an acrobat issue. 

Maybe i'll kick it to the zope list.  If I find out why this happens 
i'll post it here.

All best,


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