[Zope] The funny _.None,_ feature in DTML kind of question

[Vitaly Osipov]

Everything is more or less simple - when you invoke method by <dtml-var
meth1> - that "mapping" _ and "client" _.None are passed automagically :)

when you invoke method with explicit arguments like <dtml-var "meth1()">,
you have to pass those two explicitly like <dtml-var "meth1(_,_.None,...)">

details are here:

http://lists.zope.org/pipermail/zope/2000-January/017687.html

----- Original Message -----
From: "Johan Carlsson" <johanc@torped.se>
To: <zope@zope.org>
Sent: Thursday, June 01, 2000 12:43 AM
Subject: [Zope] The funny _.None,_ feature in DTML kind of question


> Hi,
> This feature really bugs me so I thought I
> write a Tips (or HOWTO). But I need some help.
> (Also I believe it's documented somewhere, but
> I cant figure out where...)
>
> When calling the a DTML-method the second time
> in a row the namespace just disapears.
>
> Using _.None and _ as begining arguments make
> it all work again.
>
> The questions are:
> -Why does DTML act like this, is there a logical explanition?
> -Where is this documented? (I know I say it somewhere)
> -What would be the best way to name and categorise this "feature".
>
> Best Regards,
> Johan Carlsson
>
>
> If you understand my brief problem description,
> here's a scenario:
>
> In /folder1
> there is three DTML-methods: meth1, meth2
> In /folder1/folder2
> there is a fourth DTML-method: meth3
>
> /folder1/meth1:
> <dtml-with folder2> #changes the namespace
> <dtml-call "meth3()">   # works just fine
> </dtml-with>
>
> /folder1/meth2:
> <dtml-call "meth1()">   #doesn't work
>
> /folder1/folder2/meth3:
> <dtml-var "'hällå wörld'"> # or something useful like hello foobar
>
>
> Solution:
>
> In /folder1
> there is three DTML-methods: meth1, meth2
> In /folder1/folder2
> there is a fourth DTML-method: meth3
>
> /folder1/meth1:
> <dtml-with folder2> #changes the namespace
> <dtml-call "meth3(_.None,_)">   # works just fine
> </dtml-with>
>
> /folder1/meth2:
> <dtml-call "meth1(_.None,_)">   #works like a working thing
>
> /folder1/folder2/meth3:
> <dtml-var "'hällå wörld'">   #or something useful like hello foobar (oh,
it the same...)
>
>
>
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