[Zope] TALs difficulties

[Jim Penny]

On Wed, 01 Sep 2004 14:45:19 +0200
Johan Carlsson <johanc at easypublisher.com> wrote:

> 
> Hi,
> I need help :-)
> 
> I'm trying to implement a new Widget for Archetypes.
> So I have to write TAL (not my favorite hobby).
> 
> 
> Here's what I've settled for so far:
> vocab is the DisplayList derivative (item is a key).
> 
> <tal:loop repeat="item vocab">
>      <optgroup
>          tal:attributes="label python:vocab.getValue(item);"
>          tal:condition="python:vocab.isLabel(item)">
>          </optgroup>
>      <option selected=""
>          tal:condition="not:python:vocab.isLabel(item)"
>          tal:attributes="value item;
>          selected python:test(here.unicodeTestIn(item, value), 	
>          
> 'selected', None);"
>          tal:content="python: vocab.getValue(item)"/>
> </tal:loop>

This is a simple neting mistake, try:
 <tal:loop repeat="item vocab">
      <optgroup
          tal:attributes="label python:vocab.getValue(item);"
          tal:condition="python:vocab.isLabel(item)">
         <option selected=""
            tal:condition="not:python:vocab.isLabel(item)"
            tal:attributes="value item;
            selected python:test(here.unicodeTestIn(item, value),       
 '          selected', None);"
            tal:content="python: vocab.getValue(item)"/>
      </optgroup>
 </tal:loop>

Though, as a matter of taste, I don't like this approach, I suspect that
it will be hard to maintain, as it depends on whatever is generating
vocab to deliver values in a sorted order.  To me it would be much more
natural to use a nested loop paramterized on the label value to generate
the options.

> 
> Returns something like this:
> 
> <optgroup label="A"></optgroup>
> <option>Ada</option>
> <option>Ape</option>
> <optgroup label="B"></optgroup>
> <option>Bananas</option>
> <option>Buffy</option>
> 
> What I want is:
> 
> <optgroup label="A">
>    <option>Ada</option>
>    <option>Ape</option>
> </optgroup>
> <optgroup label="B">
>    <option>Bananas</option>
>    <option>Buffy</option>
> </optgroup>
> 
> Which renders quite differently.
> 
> Best Regards,
> Johan
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