Paul,
You're right you can use IsDefined in an IIf. I do it all the time. BTW
you should probably also trim the form.fieldname.
IE:
<Cfif IIF(IsDefined("form.fieldname"), "Trim(form.fieldname)", DE("")) is
"something">
The form fieldname equals something.
</cfif>
Bud,
>From the docs.
"The function evaluates its condition as a Boolean. If the result is TRUE,
it returns the value of Evaluate(string_expression1); otherwise, it returns
the value of Evaluate(string_expression2)."
The syntax is "IIf(condition, string_expression1, string_expression2)".
So in this case if the variable does in fact exist then it will evaluate
String1. Otherwise it does string2.
HTH,
--K
-----Original Message-----
From: Paul Johnston [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, August 29, 2000 7:42 AM
To: [EMAIL PROTECTED]
Subject: RE: Can't work out IIF/IsDefined quirk
If I can't use IsDefined with IIF, how come the code I was given works then?
;)
As far as I am aware, IIF will work with any boolean expression, and
IsDefined is probably the most useful boolean function around in CF.
Paul
> -----Original Message-----
> From: Bud [mailto:[EMAIL PROTECTED]]
> Sent: 29 August 2000 15:26
> To: [EMAIL PROTECTED]
> Subject: RE: Can't work out IIF/IsDefined quirk
>
>
> On 8/29/00, Geoffrey V. Brown penned:
> >Hi,
> >Use this:
> >
> >#IIF(isdefined("form.categories"), "form.categories", de(''))#
>
> Sorry. You can't use isdefined in an IIF. If it's not defined it will
> still try and reference the variable and return an error. If you must
> use isdefined, you'll need to use a real cfif.
>
> What you can do is this:
>
> <CFIF isDefined('form.categories')>
> <cfset variables.categories = form.categories>
> <cfelse>
> <cfset variables.categories = "">
> </CFIF>
>
> IIf(variables.categories is "", DE(''), DE(variables.categories))#
>
> Or:
>
> IIf(variables.categories is "", DE(''), DE('#variables.categories#'))#
> --
>
> Bud Schneehagen - Tropical Web Creations
>
> _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
> ColdFusion Solutions / eCommerce Development
> [EMAIL PROTECTED]
> http://www.twcreations.com/
> 954.721.3452
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