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global variable on initial form

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  • global variable on initial form

    I want to dimension a global variable (company name) on a main menu, shich is the start up form. The problem is that when the main menu opens up, it looks for that variable and does not find it until the form is loaded. By that time, it produces an error box which states "Warning: Field object references a non-existent field: Var->cname"

    How can I get the main menu to load and create the variable, which is stored in the start table, without the message?

    Thanks for your help.

    Regards,

    Jay Talbott
    Jay Talbott
    Lexington, KY


  • #2
    RE: global variable on initial form

    Hi James

    Is this your users company or some other company name? May I suggest a setup table with its own form and then that data would always be there.

    Keith Hubert
    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: global variable on initial form

      James:

      If the reason you're using a variable for the company name so that if you distribute the app, you won't have to change the menu, report headers and the like, I have a tip published in tips that you might want to see.

      It is tip 31 - go to the home page and click the 'Tips' tab and look in 'General Practices'.

      Alpha On!

      Ken

      Comment


      • #4
        RE: global variable on initial form

        Just tried to look up the tip and find that tips are not loading from the main page.

        Comment


        • #5
          RE: global variable on initial form

          Jay,

          The easiest way is to set up a script called "autoexec" and define and set the global variable in the script. The variable can be obtained from another table, the main menu table or just defined in the script. Since an autoexec script runs before any form is loaded, the value will exist when you main form opens.

          Jerry

          Comment


          • #6
            RE: global variable on initial form

            Jerry,

            Actually, initialization of any variables or any other operation should be done with the object it is most associated with.

            If it has no association with only one object, then it should probably be put in the Autoexec script. But if it is only really associated with one form (or other layout), it should be in that form's ONINIT or possibly ONACTIVATE script. This keeps it together when you change things.

            One other thing. When creating global or shared variables, the form should have the variables also defined in it's variable list, as well as in the code.

            Regards,

            Ira J. Perlow
            Computer Systems Design & Associates
            [email protected]
            Regards,

            Ira J. Perlow
            Computer Systems Design


            CSDA A5 Products
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            Comment


            • #7
              RE: global variable on initial form

              Ira,

              You bring up something about which I have wondered for some time. How are the form variables used? I have defined several global variables for my application in the autoexec script (their contents are used throughout the program, by many different operations). From that point on, I use them in a variety of forms as well - both for mapping their contents and displaying them.

              However, I've never re-defined them in the forms themselves. Why do I want to do that? Isn't it redundant? I thought that form variables were just for those variables used... actually I'm not clear on this (you've probably already guessed that!).

              Any insights you might share would be appreciated. Thanks.

              Best regards,

              Geoff Hollander

              Comment


              • #8
                RE: global variable on initial form

                Geoff,

                Unfortunately, I don't feel like I have a solid handle on them either. But here is what I think.

                The form variables basically define a variable for uses by the form where you might reference a variable and not have any code associated with it. An example is displaying a variable, or an expression editor pop-up.

                Any code has to worry about it's own dimensioning of the variables.

                If the scope of the variables (Global, Shared or Local) are different from the use in the form's variables, I would expect that to lead to trouble. Don't do it!

                Regards,

                Ira J. Perlow
                Computer Systems Design & Associates
                [email protected]
                Regards,

                Ira J. Perlow
                Computer Systems Design


                CSDA A5 Products
                New - Free CSDA DiagInfo - v1.39, 30 Apr 2013
                CSDA Barcode Functions

                CSDA Code Utility
                CSDA Screen Capture


                Comment


                • #9
                  RE: global variable on initial form

                  Normally, I have found that if a variable is defined as global or shared or whatever, and then defined as a form variable with a different scope, Alpha will generate an error message when the form is edited. Sometimes finding the conflict can be a real headache.

                  Another issue comes up during editing. If variables are defined by a script, be sure to run the script before doing any editing of forms, etc. that use the variable or the object won't find the variable and will generate an error. I quess that is one reason for redefining the variable again as a form variable.

                  I use variables frequently and usually define globals in a script run by autoexec, variables used only by a form as form layout variables, and variables used by scripts as script variables. Infrequently, I use shared variables if I need to send a value between scripts or forms. Normally, I only define a variable once and set it's scope then.

                  Jerry

                  Comment


                  • #10
                    RE: global variable on initial form

                    Thanks Ira,

                    It's nice to know I'm not the only one who is confused about these. Your points are well taken.

                    Thank you.

                    Best regards,

                    Geoff Hollander

                    Comment


                    • #11
                      RE: global variable on initial form

                      Jerry,

                      Agreed. All good points. Thanks.

                      Regards,

                      Geoff Hollander

                      Comment


                      • #12
                        RE: global variable on initial form

                        The webmaster was notified by e-mail about this issue with the tips section just 5-10 minutes ago.

                        Comment


                        • #13
                          RE: global variable on initial form

                          Ira,

                          Thanks for your thoughts. My friend Barry Rochford suggested the same thing when I talked to him on the phone about this issue this afternoon, before reading the slew (slue?) of responses this question generated.

                          Thanks all for your help.

                          Regards,

                          Jay Talbott
                          Jay Talbott
                          Lexington, KY

                          Comment


                          • #14
                            RE: global variable on initial form

                            Just to add a little here, if you do distribute your application you can use a parameter table to hold company details such as name etc.. and fill the global variables from this table from within the autoexec script.

                            Ron

                            Comment


                            • #15
                              RE: global variable on initial form

                              Ron,

                              Exactly the method I use to fill many global variable values. It makes the app much more portable. Using this method, you don't need to hard code report titles, form titles, etc, just use global variables. Just fill in the company table for the specific company, and all values will be correct. You can also use this if the user has more than one configuration or location for the company. Each configuration can have unique values.

                              Jerry

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