Item1733: %PARAMs can't be used in %IFs

... because they are not added as preference variables. They are substituted into the message as is which is too late in the parsing order for other tags like %IF to read them.

Try this:

%IF{
  "'%PARAM1%.%PARAM2%'='%TRASHWEB%.TrashAttachment'"
  then="this is a DELETE"
  else="this is a MOVE"
}%

Doesn't work. I tried to figure out how to fix that and found out that the %PARAM values are added to oopses and error messages in quite different places. Confusing. Anybody else a clue?

-- MichaelDaum - 16 Jun 2009

Oh, I got this working using

%IF{
  "'%URLPARAM{param1}%.%URLPARAM{param2}%'='%TRASHWEB%.TrashAttachment'"
  then="this is a DELETE"
  else="this is a MOVE"
}%

Foswiki is so so strange sometimes

-- MichaelDaum - 16 Jun 2009

Isn't this handled with the %IF{"$ MACRO syntax, or %IF{"$ urlparam ? Can we set this to No Action?

-- GeorgeClark - 16 Mar 2011

That does not really matter. The point is that %IF{...%PARAM...} isn't parse inside-out-left-to-right because %PARAMs are no first class citizens.

-- MichaelDaum - 17 Mar 2011