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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Greg Conway