[Zope] Passing parameters using DTML

[J Cameron Cooper]

> John Poltorak wrote:
>
>> On Fri, Jun 17, 2005 at 07:09:04PM +0200, Dieter Maurer wrote:
>>
>>> Tino Wildenhain wrote at 2005-6-17 10:57 +0200:
>>>
>>>> ...
>>>> Not at all. You could either have tried
>>>> it out ;) Or looked at the DTML documentation
>>>> in the Zope book *wink* ;)
>>>>
>>>> <dtml-var expr="somemethod(parm1=value1,parm2=value2)">
>>>
>>>
>>> Be warned: this is likely to cause loss of the namespace.
>>> Do not forget to pass the two positional arguments (usually
>>> as "None, _"). They are essential.
>>>
>>> For more details, read "Calling DTML Objects" of
>>>
>>>  <http://www.dieter.handshake.de/pyprojects/zope/book/chap3.html>
>>
>>
>> That looks useful.
>>
>> Is there also something which explains how to call ZPTs from a DTML 
>> object?
>>
>> I'm unable to pick up a passed parameter.
>>
>> This is what I've conjured up:-
>>
>> python:here.lib.parse_file(file=context.options['parm'],sepr=',',clone=1)"> 
>>
>> hoping that "options['parm']" would get resolved as "ABC" but it 
>> doesn't.
>>
>> Any ideas? 
>
When you call a ZPT like::

  context.somePT(dog="beagle")

you can get to it in the template like::

  options/dog

or::

  python:options.dog

or::

  python:getattr(options,'dog')

or maybe even::

  python:options['dog']

Note that in the last two, I didn't need to know the name of the 
parameter at coding time, but could find it at runtime. If I have::

  tal:define="att string:dog"

then I can do::

  python:getattr(options,att)

The 'options' name is not contained in context. It is it's own 
first-class namespace.

If 'parse_file' above is a ZPT, you can ask for options/file, 
options/sepr, and options/clone.

        --jcc

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