Jonathan wrote:

----- Original Message ----- From: "David H" <[EMAIL PROTECTED]>
To: "zope user list" <>
Sent: Sunday, August 27, 2006 8:54 PM
Subject: [Zope] Reportlab issue

Hi Zope List,

I have an Zope application that uses ReportLab to generate acrobat viewable reports. (I already posted this to reportlab list - so far no solutions).

Heres the problem:

I display an acrobat report (using 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 I click various unrelated pages in the application (clearing the request,etc) 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 reported has changed, and this occurs even if a different report is generated!

Note: that I use

import tempfile and
tmpFile2 = tempfile.mktemp()

to keep pdfPath's unique ...

I've tried combinations of "Content-Disposition" params like changing filename=, etc. Nothing is changing this behavior.

I've tried (a reportlab mailing list suggestion) varying to <forms action= like

<form name="printform" method="post" action="extensions/pyBudgetReports" tal:attributes="action python: 'extensions/pyBudgetReports/?random=' + context.python.pyTime()">

No help either.

I have never used ReportLab, but is there a possibility that when you go back to the adobe document it is being served from a cache? You could try using html meta tags or response.setHeader (better) to make sure the document is not being served from the cache.

Just a shot in the dark!


Hi Jonathan,

Yes, I did try that, e.g. (report lab + external file stuff)
  # -----------------------------------------------------------
  def writeReport(self, RESPONSE):
  # -----------------------------------------------------------
       generates report output
        theFile=open( self.pdfpath,'rb')
        result =
# the next 3 lines were snarked from google "zope no cache" I think its a casey duncan recipe ...
        RESPONSE.setHeader('Pragma', 'no-cache')
        RESPONSE.setHeader('Expires', 'Sat, 1 Jan 2000 00:00:00 GMT')
        # the normal fair
        RESPONSE.write(result) # result is

And it didn't help.

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