[Zope] Math with a DTML variable

[Jonathan Hobbs]

----- Original Message ----- 
From: "Marc Burgauer" <marc at sharedbase.com>
> I want to do some math in DTML, here an example:
> 
> <dtml-let myCounter=0>
>      <dtml-in expr="some_method(_['a_current_id'])">
> 
>        <dtml-if checked>
>          <dtml-call expr="myCounter=myCounter+1">
>        </dtml-if>
> 
>      </dtml-in>
> 
>      <dtml-if expr="myCounter>0">
> 
>        DO SOMETHING!
> 
>      </dtml-if>
> 
> </dtml-let>
> 
> "some_method" returns a sequence where some items might have an 
> attribute "checked". So while I iterate over the sequence I want to 
> change the value of "myCounter".

You need to set up and manipulate the counter as follows:

<dtml-call "REQUEST.set('myCounter', 0)">

<dtml-call "REQUEST.set('myCounter', myCounter+1)">

This would be much cleaner in a python script.

HTH

Jonathan