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Watch Expression Doesn't Work

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    Watch Expression Doesn't Work


    Apparently, you can update the choices and values in a list box automatically by telling A5 to watch a given field and repopulate when the value changes. You are supposed to be able to do this like this:

    Listbox / Properties / Choices / Computed Automatically / Edit Filter Expression

    When you get this far, you get a dialog box asks for a Watch Expression, which I think can just be a field name.

    It's poorly documented. On my version of A5, Build 1506, this feature doesn't work. The field name doesn't get saved when you click OK and hence, the Watch Expression function will not work.

    I'd really appreciate some advice on how to work around this please...

    PC

    #2
    RE: Watch Expression Doesn't Work

    Hi Peter,

    Look in the Big Help file for "List Box Table Lookup". Watch is well documented and there is even a download to show exactly how it all works. What more could you ask for? If you have not downloaded it (30 meg) it is available online.

    Regards

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


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

    Comment


      #3
      RE: Watch Expression Doesn't Work

      Keith, this doesn't really do it.

      I've spent hours trying to figure this out, so telling me to "look in the help file" isn't really helpful - I wouldn't be asking here if I wasn't already at my wit's end...

      There seems to be no way to simply specify a Watch Expression without also filling in a filter expression - and I don't want to apply a filter.

      As I said, the documentation is inadequate on this - it assumes you always want to filter the data.

      PC

      Comment


        #4
        RE: Watch Expression Doesn't Work

        Peter,

        At the risk of being criticized for bothering you with another indadequate suggestion, have you considered entering a filter expression that's always evaluated as True ?

        -- tom

        Comment


          #5
          RE: Watch Expression Doesn't Work

          To supplement what Tom advised, and to be specific, you can enter a filter of

          1"0

          Comment


            #6
            RE: Watch Expression Doesn't Work


            I think I'll have to do that... create a junk variable just to evaluate... but then I'll have to change it each time the target field changes... which doesn't seem elegant, but it may work...

            Incidentally, I really don't appreciate the sarcasm. I'm a newbie at this, and being told to RTM or being treated sarcastically is a major turn-off. Everyone has to start somewhere, you know, even old pros...

            Will think twice before bothering you again.

            PC

            Comment


              #7
              RE: Watch Expression Doesn't Work


              Thanks, thats very useful, will do.

              PC

              Comment


                #8
                RE: Watch Expression Doesn't Work

                Peter

                You could try a filter of .T.

                Regards

                Glen Schild
                Glen Schild



                My Blog

                Comment


                  #9
                  RE: Watch Expression Doesn't Work

                  Peter,

                  If I've offended please accept my apology. Good luck with your project. -- tom

                  Comment


                    #10
                    RE: Watch Expression Doesn't Work

                    This will now be clearer in the documentation.

                    Comment

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