[Zope] dtml-if fustration!

[Greg Conway]

Hi Ausum,

Thanks for the reply. What I actually mean is - the name of the variable I
want the value of is stored inside another variable, in the request.

For example...

REQUEST.StoredVar[1] contains SelectStudentID

and I want to perform a dtml-if condition based on whether SelectStudentID
contains a value or not!

So to get this value I perform a '_.getattr(REQUEST,StoredVar[1])' command.

But I cannot seem to do this within a <dtml-if ... > statement, it throws up
an error if the variable does not exist, presumably because I'm trying to
work through an extra layer of variables....

just to make life complicated :)

hope this is now clearer, any help much appreciated!

Regards,

Greg.

>> -----Original Message-----
>> From: zope-admin@zope.org [mailto:zope-admin@zope.org]On Behalf Of Ausum
>> Studio
>> Sent: 24 August 2002 18:39
>> To: zope@zope.org
>> Subject: Re: [Zope] dtml-if fustration!
>>
>>
>> What is the "next pass"?. Do you mean within the same page?
>> If so, you don't need to declare the variable, as long as it's
>> been already
>> defined for the whole page. Just use <dtml-var SelectSID> anywhere.
>>
>> Now, if you need to change its value, and then use it on the remaining
>> portion on the rendered page, the anwser is the same, use <dtml-var
>> SelectSID>. You don't need to use the "REQUEST.SelectSID" part.
>>
>>
>> Ausum
>>
>>
>> ----- Original Message -----
>> From: "Greg Conway" <greg@gmlnt.com>
>> To: "Zope@Zope. Org" <zope@zope.org>
>> Sent: Saturday, August 24, 2002 11:56 AM
>> Subject: [Zope] dtml-if fustration!
>>
>>
>> > Hi all,
>> >
>> > I have a fustrating problem with dtml-if's!! I've tried to
>> work round it
>> in
>> > many ways, but there is probably an easy one I am overlooking
>> knowing my
>> > luck...
>> >
>> > Anyway... Consider the following dtml-if statement:
>> >
>> >     <dtml-if SelectSID>
>> >       SelectSID = <dtml-var SelectSID>
>> >       <dtml-call "REQUEST.set('SelectSID', SelectSID)">
>> >     </dtml-if>
>> >
>> > This works okay, and stores the variable SelectSID in the
>> request for the
>> > code to pick up again on it's next pass.
>> >
>> > However, on the next pass, the variable SelectSID doesn't exist! As the
>> > variable is now REQUEST.SelectSID - and the following code doesn't
>> work....
>> >
>> >     <dtml-if "REQUEST.SelectSID">
>> >       SelectSID = <dtml-var SelectSID>
>> >       <dtml-call "REQUEST.set('SelectSID', REQUEST.SelectSID)">
>> >     </dtml-if>
>> >
>> > ...as an error is thrown up if REQUEST.SelectSID doesn't exist!
>> >
>> > Anybody got a simple answer to my dilemma?!!
>> >
>> > Many thanks for any help!
>> >
>> > Regards,
>> >
>> > Greg Conway.
>> >
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