[Zope] Scoping of <dtml-let>

[Kevin Carlson]

I would use a script to solve the scoping problem.  Pass in the request,
perform your logic and return a value to a <dtml-let> tag.

-----Original Message-----
From: zope-admin@zope.org [mailto:zope-admin@zope.org]On Behalf Of
Jean-Francois.Doyon@CCRS.NRCan.gc.ca
Sent: Wednesday, January 08, 2003 3:49 PM
To: zope@zope.org
Subject: [Zope] Scoping of <dtml-let>


Hello,

In my hunt for my memory leak, I have discivered I probably shouldn't use
REQUEST.set nearly as much as I do.

So now, I have a few questions/problems regarding <dtml-let> ...

First of all, is there any way to have it scope over more than one object?
For instance, how would I set a variable in standard_html_header that would
be valid for the entire output (i.e. that could be used by other DTML code
that is rendered after standard_html_header, as part of a given page of
output?) For instance I used to do REQUEST.set(sniffer, usersniffer()) ...
The sniffer dictionary was then available everywhere thereafter, including
DTML code in the object containing the header. Unfortunately, using
<dtml-let>, I can't do this, since I can't even save a dTML document where a
<dtml-let> opens but isn't closed (I would close it, say, in the footer). Is
there any proper DTML way of doing something liek this without using
REQUEST.set ???

Also, basically on the same topic, how do I nest <dtml-let> with <dtml-if> ?
One of the reasons I resorted to using REQUEST.set is because I often would
want to do things like:

<dtml-if "">
    <dtml-let>
<dtml-else>
    <dtml-let>
</dtml-if>

</dtml-let>

Which doesn't work, and I bviously don't want to repeat entire blocks of
code for both conditions, and in most cases breaking them out into seperate
objects doesn't make sense either ...

Any insight into how to get around these issues would be much appreciated!

Thanks in advance,

Jean-François Doyon
Internet Service Development and Systems Support / Soutien de systèmes et
developement de services Internet
GeoAccess Division / Division GéoAccès
Canada Center for Remote Sensing / Centre canadien de télédétection
Natural Resources Canada /  Ressources naturelles Canada
Phone / Téléphone: (613) 992-4902
Fax / Télécopieur: (613) 947-2410
http://atlas.gc.ca


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