FW: [Zope] dtml-if fustration! (right code!)
Greg Conway
greg@gmlnt.com
Sun, 25 Aug 2002 17:55:31 +0100
Okay, scrub all that...
Here's the right code! :)
<dtml-in "REQUEST.CustomLinkVars">
<dtml-let Counter=sequence-index>
<dtml-let OuterVar=sequence-item>
<dtml-if "_.getattr(REQUEST,REQUEST.CustomLinkVars[Counter])">
<dtml-if sequence-start>
<dtml-if "REQUEST.Where==0">
WHERE
</dtml-if>
</dtml-if>
<dtml-if "REQUEST.NeedSeperator==1"> AND <dtml-call
"REQUEST.set('NeedSeperator',0)"></dtml-if>
<dtml-var "REQUEST.CustomLinkFields[Counter]">=<dtml-var
"_.int(_.getattr(REQUEST,REQUEST.CustomLinkVars[Counter]))">
<dtml-call "REQUEST.set('NeedSeperator',1)">
</dtml-if>
</dtml-let>
</dtml-let>
</dtml-in>
I'm not going to snip anything this time so I don't mess it up in any way!!
REQUEST.CustomLinkVars is an array, currently containing (ie)
['SelectStudentID']
but could contain ['SelectStudentID','SelectOrgID','SelectHomeID'], etc.
and could also be empty! [''].
When this array is empty, no problems - the whole section doesn't run as
it's inside a <dtml-in .. > statement. that's good.
The problem occurs when this array DOES contain a value, but the value of
the variable it contains does not exist in the request.
ie REQUEST.CustomLinkVars is an array containing ['SelectStudentID'], but
SelectStudentID is not a variable in the request.
I want this line... <dtml-if
"_.getattr(REQUEST,REQUEST.CustomLinkVars[Counter])">
... to test if this variable inside a variable exists inside the request,
and act accordingly.
BUT it doesn't - it throws up an error if the variable does not exist!!
So, hopefully it makes sense THIS time!!
many thanks for any help!
Regards,
Greg.
>> -----Original Message-----
>> From: zope-admin@zope.org [mailto:zope-admin@zope.org]On Behalf Of Greg
>> Conway
>> Sent: 25 August 2002 17:18
>> To: Michael
>> Cc: Zope@Zope. Org
>> Subject: RE: [Zope] dtml-if fustration!
>>
>>
>> Hi Michael,
>>
>> Okay, here is a prime example of what I am trying to achieve!
>>
>> here's the code... (it's a snippet of a DTML method)
>>
>>
>> <dtml-if "_.getattr(REQUEST,REQUEST.Variable)">
>> <dtml-in "REQUEST.CustomLinkFields">
>> <dtml-let Counter=sequence-index>
>>
>> <dtml-var "REQUEST.CustomLinkFields[Counter]">=<dtml-var
>> "_.int(_.getattr(REQUEST,REQUEST.Variable))">
>>
>> </dtml-let>
>> </dtml-in>
>> </dtml-if>
>>
>> "Variable" as var in memory, let's say it contains "SelectStudentID".
>>
>> Now... sometimes this DTML method (form) will be called from
>> another form so
>> the variable "Variable" set, and other times this variable will
>> not be set!
>>
>> The idea is the middle line of code should print the contents of the
>> variable "SelectStudentID" - if it exists. If it doesn't, I want Zope to
>> ignore this line of code.
>>
>> I have to put the code [ _.getattr() ] inside quotes [ " ... "
>> ], but if I
>> do this then errors occur when I call the form without this
>> variable set -
>> as it doesn't exist.
>>
>> I got round the problem by hard-coding the variable name into
>> the page, but
>> I don't want to do this, I want DTML to look up the value for me, and act
>> based on whether there is such a variable stored in the request,
>> the way a
>> normal <dtml-if Variable> would work - by not throwing up an error if the
>> variable doesn't exist!!
>>
>> Hope this is now clearer, any enlightenment much appreciated!!
>>
>> Regards,
>>
>> Greg.
>>
>> >> -----Original Message-----
>> >> From: Michael [mailto:michael@nichestaffing.com]
>> >> Sent: 24 August 2002 20:15
>> >> To: Greg Conway; Zope@Zope. Org
>> >> Subject: Re: [Zope] dtml-if fustration!
>> >>
>> >>
>> >> This statement will check to see if SelectSID contains a value,
>> >> if true, it
>> >> will set the value, if false, it will not. I'm not really
>> sure of what
>> >> you're trying to do with [ SelectSID = <dtml-var SelectSID> ]
>> >>
>> >> <dtml-if expr="selectSID">
>> >> <dtml-call "REQUEST.set('SelectSID',SelectSID)">
>> >> </dtml-if>
>> >>
>> >>
>> >> Michael
>> >>
>> >> On Saturday 24 August 2002 10:56 am, Greg Conway wrote:
>> >> > 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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