[Zope] dtml-if Newbie Question

[Russell Hires]

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Are you checking for a checkbox? Then you should do (for example),
<dtml-if expr="REQUEST.has_key('check_box')">
  Checked!
</dtml-if>

Got this from Jim Penny. 

I think the Zope book should include this type of situation, if it doesn't 
already...

HTH

Russell
On Tuesday 05 November 2002 06:46 am, you wrote:
> Hi,
>
> From the 'Zope Book' the statement
>
> <dtml-if variable>
>
> means that 'if the..variable does not exist, then this condition is
> false'.
>
> I found that this is not true.  When I tried using dtml-if to a
> non-existent variable, I got a 'key error'. So how do I check if the
> variable does not exist ?
>
> Tks.
>
> AL
>
>
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