Re: apparent variable variable display?
This WebDNA talk-list message is from 2000
It keeps the original formatting.
numero = 31314
interpreted = N
texte = In Perl, this would be the difference between defined and exists. In your case, [Header40] is always defined (when in an order context). The test [showif [header40]=] should do what you want. Only if a variable has never been defined (i.e. never used) will [Header1]=[raw][Header1][/raw]be trueJohn PeacockJohn Butler wrote: > > I finding something inconsistent, tho it might be my brain...? > I want to do something if one of the orderfile headers has not yet been given a value. > I have successfully been using this- > > [showif [Header1]=[raw][Header1][/raw]] > do stuff > [/showif] > > But when I stick this on my template- > > Header40=[Header40] > > Then it returns- > Header40= > > so which is it? Do undefined orderfile headers display as the null string (like empty > db fields), or do they display as uninitialized vars, like [somevar]? > If the former then why does my showif above evaluate to true? > > -John > > ------------------------------------------------------------- > This message is sent to you because you are subscribed to > the mailing list
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In Perl, this would be the difference between defined and exists. In your case, [Header40] is always defined (when in an order context). The test [showif [header40]=] should do what you want. Only if a variable has never been defined (i.e. never used) will [Header1]=[raw][Header1][/raw]be trueJohn PeacockJohn Butler wrote: > > I finding something inconsistent, tho it might be my brain...? > I want to do something if one of the orderfile headers has not yet been given a value. > I have successfully been using this- > > [showif [Header1]=[raw][Header1][/raw]] > do stuff > [/showif] > > But when I stick this on my template- > > Header40=[Header40] > > Then it returns- > Header40= > > so which is it? Do undefined orderfile headers display as the null string (like empty > db fields), or do they display as uninitialized vars, like [somevar]? > If the former then why does my showif above evaluate to true? > > -John > > ------------------------------------------------------------- > This message is sent to you because you are subscribed to > the mailing list . > To unsubscribe, E-mail to: > To switch to the DIGEST mode, E-mail to ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to
John Peacock
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