[Zope] Feeling like a newbie.. document id if statement?

[Marcel Preda]

----- Original Message ----- 
From: Timothy Wilson <wilson@visi.com>

> On Wed, 24 May 2000, Rik Hoekstra wrote:
> 
..
> > > Ok.. this is really dumb, but for some reason I can't get this to work.
> > > 
> > > <dtml-if "id=='index_html'">
> > 
> > I believe this should be 
> > 
> >  <dtml-if "_['id']=='index_html'">  
> 
> I wonder if someone would be kind enough to translate Rik's code into Enlish
> for me. I know that expressions inside "" are Python, but what is the
> function of the [] and _?
> 

The special "namespace" variable, "_"
It is useful to access the variables with special names, like "sequence-index"
For example:
<dtml-if  "sequence-index==3" > will not work 
"sequence MINUS index==3" :-)
You have to use <dtml-if  "_['sequence-index']==3" >

In fact "_['id']" is the some thing with "id" , I presume (or maybe I'm wrong).
so, is no difference between 
<dtml-if "id=='index_html'">
&&
<dtml-if "_['id']=='index_html'">  


Find more @:
http://www.zope.org/Documentation/Guides/DTML-HTML/DTML.5.3.2.3.html


Marcel