Try using "exists:".
http://pagetemplates.org/docs/latest/reference.html#types
E.g.
<div tal:condition="exists: some_callable">
...
\malthe
On 29 October 2011 15:34, Mark Erbaugh <[email protected]> wrote:
> Is there a way in a tal:condition test to test if a given variable has been
> defined? For example, if my view callable has not defined a variable in the
> response object, can I use a tal:condition to exclude a section of the
> template that depends on that variable being defined?
>
> Here's what I'm trying to do. I have a template that provides the bulk layout
> of each page. It's used as a macro that each individual page includes. As
> part of the macro, I'd like to have a section that is included only if the
> individual page defines a variable. tal:condition seems to require that the
> variable be defined and have a False value. One approach I thought of, but
> couldn't seem to get working was to define the variable to nothing in the
> macro (tal:define="variable nothing") and have the client view re-define it,
> but I must not understand scope or something as the client definition of the
> variable didn't seem to replace the tal:define value.
>
> Mark
>
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