[Zope] Q: what is the parameter "_.None" in calls to document templates?

[Martijn Pieters]

At 13:40 20/09/99 , Joerg Wittenberger wrote:
>Within the "common/Contacts" there are some DTML documents, one for
>each person.  Those documents have properties like "surname" etc.
>
>There is also a dtml method "asOptions" like that:
>
><dtml-in "objectValues('DTML Document')">
><option value="<dtml-var id
> >"><dtml-var firstname> <dtml-var surname
> ></option>
></dtml-in>
>
>I tried to call that DTML method from within the "docs" folder, but
>the result I see is quite not what I want.  I did:
>
><selection name="xyz">
><dtml-call "common.Contacts.asOptions(_.None, _, REQUEST)">
></selection>
>
>This way no options at all are found.  I also tried to modify the
>first parameter as "_", "common/Contacts" with errors like "KeyError:
>headers" and authorization faliure.
>
>Any help appreciated.
>
>Thanks a lot

First, use dtml-var in stead of call, because call doesn't insert anything 
into your document.

Second, you could also do:

<dtml-with "common.Contacts"><dtml-var asOptions></dtml-with>

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Martijn Pieters, Web Developer
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