What is the best way to check if parameters passed into a URLFOR function are valid?

I am trying to pass in a target and id without any inputs or an override param.



I'm trying to check for Null and blank values.

    {!IF(Param1 != NULL && Param2 != NULL),
  • Are param1 and param2 values from the controller (standard or custom)?. Did you look at the ISBLANK(..) function? – cropredy Aug 31 '14 at 20:45

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