[Zope] ZPT Help!

[Michael Fox]

That's work great, thanks Paul!

-----Original Message-----
From: zope-bounces+michael=centurysoftware.com.au at zope.org
[mailto:zope-bounces+michael=centurysoftware.com.au at zope.org] On Behalf
Of Paul Winkler
Sent: Wednesday, 21 July 2004 3:21 AM
To: zope at zope.org
Subject: Re: [Zope] ZPT Help!


On Tue, Jul 20, 2004 at 03:59:22PM +1000, Michael Fox wrote:
> If there is no matching image I want to display an "image 
> unavailable", but can't get this to work.
> 
> <span tal:define="image string:${here/id}.jpg">
> 
>   <span tal:replace="image"></span>
> 
>   <span tal:condition="not:python:here.objectIds(image)">

That can't work.
objectIds() returns a list of IDs and takes no arguments.

The simplest thing would be:

    <span tal:condition="python:image not in here.objectIds()" />

That could be problematically slow if there are a whole lot of objects
in the folder. You could also try:

    <span tal:condition="python:not hasattr(here, image)" />

... but that is only good if you know that objects with the image ID
will not be acquired from elsewhere in the current context.

-- 

Paul Winkler
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