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check for existance of variable

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  • check for existance of variable

    I have an OnInit event on a form which uses variables and I would like to check for the existance of the variable(s) before proceeding.
    I have tried:-

    "if .not. exist(variable_name)
    dim variable_name as c
    end if

    but without success

    Thanks Michael Mee

  • #2
    RE: check for existance of variable

    How and where was the variable created??

    You can DIM a variable in the on_init without causing any problems, in fact, I think you need to DIM the variable to make it available.

    Once it is DIM'd, Then just check for the content. If it is not null, then all is OK, else do whatever routine you need to establish the value.



    • #3
      RE: check for existance of variable

      Hi Michael,

      Rather than testing if a variable exists, create one then give it a value you can base your next action on. The type of variable can be created on one form as Global and then used on another form. I hope that has not confused you too much.

      Keith Hubert
      Keith Hubert
      Alpha Guild Member
      KHDB Management Systems
      Skype = keith.hubert

      For your day-to-day Needs, you Need an Alpha Database!


      • #4
        RE: check for existance of variable

        Thanks Lads

        Its a global variable created in another form


        Michael Mee


        • #5
          RE: check for existance of variable


          if .not. exist(variable_name)


          if eval_valid("variable_name") = .f. then


          Lenny Forziati
          Vice President, Internet Products and Technical Services
          Alpha Software Corporation


          • #6
            RE: check for existance of variable


            As you have created the variable as Global you should be able to make use of it in Action Scripting.

            Just as a matter of interest, now that Lenny has shown you to test if the variable exists what are you doing with it?

            Keith Hubert
            Keith Hubert
            Alpha Guild Member
            KHDB Management Systems
            Skype = keith.hubert

            For your day-to-day Needs, you Need an Alpha Database!


            • #7
              RE: check for existance of variable

              Hi Hubert

              Firstly, if it had no value, ie a date variable with { / / }, I was going to give it a value - say one year ago - sometimes, its useful in searches to allow the user to go back when "how far back" is unknown.

              I have loads of ideas - only a small number work

              Thanks all

              Michael Mee