[Zope-dev] How to concatenate ID + string to check for object?

[Adrian Hungate]

This is really a question that would be better asked on the Zope mailing
list - This list is intended for questions about developing Zope.

None the less, what you have wrong is the line :
<dtml-if expr="<dtml-var id>+'.png'">

You can't have the dtml-var embeded in the dtml-if statement.

This might work a little better:
<dtml-try>
<dtml-let imageObject="_[getId()+'.png']">
<img src="<dtml-var getId>.png" border=0>
</dtml-let>
<dtml-except>
<img src="default_icon.png" border=0>
</dtml-try>

But, as the image object has already been obtained, you could replace:
<img src="<dtml-var getId>.png" border=0>

with
<dtml-var "imageObject.tag(border=0)">

Adrian...

--
Adrian Hungate
EMail: adrian@haqa.co.uk
Web: http://www.haqa.co.uk

----- Original Message -----
From: "EvH" <edward_van_h@bigfoot.com>
To: <zope-dev@zope.org>
Sent: Saturday, July 20, 2002 1:15 PM
Subject: [Zope-dev] How to concatenate ID + string to check for object?


> Hi,
>
> I've done my homework before posting, but can't find a way out: When
adding
> articles to my intranet, if an icon exists (eg. if it's an article about
> Zope, I added the Zope icon to ZODB), I will display it in a corner; If no
> icon exists for this article, I'll display a default icon to avoid having
> an empty "IMG" box. I've tried multiple things, but none work. Here's the
> latest trial:
>
> //Zope complains that the first line below is NOK
> <dtml-if expr="<dtml-var id>+'.png'">
> <img src="<dtml-var id>.png" border=0>
> //To check that concatenating both strings works
> <dtml-var id>.png
> <dtml-else>
> <img src="default_icon.png" border=0>
> <dtml-var id>.png
> </dtml-if>
>
> Any idea?
> Thx
> EvH.
>
>
>
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