nice...i don't remember seeing this before.
~ dina
----- Original Message -----
From: "Chris Lofback" <[EMAIL PROTECTED]>
To: "CF-Talk" <[EMAIL PROTECTED]>
Sent: Monday, June 03, 2002 2:43 PM
Subject: RE: if value exists, show it
> I like using CF's "short circuit" logic (introduced in 4.5, I
think?) like
> this:
>
> <CFIF IsDefined("variable") AND Len(Variable)>
> #variable#
> </CFIF>
>
> Evaluation is sequential in the CFIF. This way, you only show
the variable
> if it exists and is not empty. Something similar can be done
with numbers:
>
> <CFIF IsDefined("variable") AND IsNumeric(Variable)>
> #variable#
> </CFIF>
>
> Or make sure the number is not zero:
>
> <CFIF IsDefined("variable") AND IsNumeric(Variable) AND
Variable>
> #variable#
> </CFIF>
>
> Etc...
>
> Chris Lofback
> Sr. Web Developer
>
> TRX Integration
> 28051 US 19 N., Ste. C
> Clearwater, FL 33761
> www.trxi.com
>
>
>
> -----Original Message-----
> From: Justin Scott [mailto:[EMAIL PROTECTED]]
> Sent: Monday, June 03, 2002 3:36 PM
> To: CF-Talk
> Subject: Re: if value exists, show it
>
>
> Hi Trey!
>
> > I simply want to test to see if a variable has a value (eg
text has been
> > returned from a query) and if so, show it. There seem to be a
few
> options --
> >
> > <cfif isdefined(#variable#)>
> > #variable#
> > </cfif>
>
> As Raymond already pointed out, isDefined() takes a string as
the input and
> returns a boolean that tells if the variable exists or not.
This will
> return true even if the string is empty. There is no locking
required
> specifically for isDefined().
>
> > <cfif len(#variable#) GT 0>
> > #variable#
> > </cfif>
>
> This assumes the variable exists and will output its contents
if it is not
> empty (sounds closest to what you want). This could be better
written
> simply as..
>
> <cfif len(variable)>
>
> > <cfif #variable# IS "">
> > #variable#
> > </cfif>
>
> This will not do much, since you're displaying the string if it
IS empty.
> If you changed the operator to IS NOT or NEQ it would act just
like the
> len() does above. I would presonally prefer using len() in
this case.
>
> -Justin Scott, Lead Developer
> Sceiron Internet Services, Inc.
> http://www.sceiron.com
>
>
>
>
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