Rik Hoekstra wrote:

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-----Original Message----- From: stoermer@migserv.augsburg.mig.net [mailto:stoermer@migserv.augsburg.mig.net]On Behalf Of Heiko Stoermer Sent: Tuesday, September 07, 1999 10:01 AM To: Timothy Grant; Zope Mailing List Subject: Re: [Zope] Building a list programmatically under DTML

Timothy Grant wrote:

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Hi,

I'm working on a project where I need to build a list programmatically

I have tried a number of variations of the following without much success. Once the list has been built, I need to pass it on to the next page:

<dtml-call "REQUEST.set('idx', 0)"> <dtml-call "REQUEST.set('desc', [])"> <dtml-call "REQUEST.set('desc_qty', [])"> . . . <td> <dtml-var expr="_[Category]"> <dtml-if "_[Category][0:2] <> 'No'"> <dtml-call "REQUEST.set('desc[&dtml-idx;]', _[Category])"> <dtml-call "REQUEST.set('desc_qty[&dtml-idx;]', qty)"> <dtml-call "REQUEST.set('idx', idx + 1)"> </dtml-if> </td>

All help would be greatly appreciated!

Hi Timothy, first of all: I can't give you a solution... :-( But maybe I can give you a hint, because I had a similar problem the other day. Unlike PERL, python does not allow you to populate a list by indexing slots that are not populated yet. So the following code:

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lst = [] lst[10] = 'foo' will give you the following error: IndexError: list assignment index out of range But as I can see from your code above, that's exactly what you would like to do, and I doubt that DTML-lists behave any different than python lists... Maybe you should switch to an External Method that gives you access to the list object's "append()" method, which allows you to expand an existing (empty) list.

Just a short reply. As far as I know you can use append in dtml as well. For example

<dtml-call expr="REQUEST.set('somevar', [])"> <dtml-call expr="somevar.append('somevalue')">

Rik

even better ! :-) Heiko -- Heiko Stoermer MIG Augsburg