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Drop Down List Box

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  • Drop Down List Box

    Hi
    I am have trouble with the drop down list box I have a set
    with 2 tables Table 1 is link to table 2 in a one to many link
    and I made a form for the set I put a drop down list box on
    the form that I want to lookup all models in a field in table 2
    it only shows one model when their are several

    Any Help

    Thank you
    Ray

  • #2
    RE: Drop Down List Box

    Ray it sounds as though you expect the controls you put on the form to be unbound that's not how Alpha Five works there is no such thing as a form separate from its underlying table or set when you open the form, you open the underlying table or set upon which it is based the controls are automatically bound to the fields in this instance of the set or table your listbox is displaying the current (active) records in the linked child table it will not display all records in the child table because the form is based on a set and the current composite record in the set includes one parent record and only its linked child table records

    Comment


    • #3
      RE: Drop Down List Box

      Hi Tom
      Thank you so is their a way to get a list box that shows
      all or is the only thing I can do is use lookup in field rules hope not

      Ray

      Comment


      • #4
        RE: Drop Down List Box

        Ray, what's the list to be used for?

        Check the ui_get_list_array() function. The array could be loaded when the form is opened, and then you could display the list using this function...

        Alternatively, you might add another instance of the child table to your set, and define a link key which links each parent record to all child table records...

        -- tom

        Comment


        • #5
          RE: Drop Down List Box

          As per Tom's suggestion you can put the following linking expression on both the parent and child side of the set:

          "X"

          That will link every child to every parent.
          Peter
          AlphaBase Solutions, LLC

          [email protected]
          https://www.alphabasesolutions.com


          Comment


          • #6
            RE: Drop Down List Box

            Hi Tom

            The List will be used for looking up several models and I
            tried to find info on the ui_get_list_array() function and
            I can't find any reference to try this as far as adding another instance of the child table to my set, and define a link key which links each parent record to all child table records... I defined a one to many link and can't get it to work.

            Any help please be as thorough as possible I am very new to A5

            Thank You
            Ray

            Comment


            • #7
              RE: Drop Down List Box

              Ray:
              ZIP up your files and post to this board.
              Maybe someone could help
              Charlie Crimmel

              Comment


              • #8
                RE: Drop Down List Box

                Ray,

                Sounds to me like you're intending the drop down list box to display the models which are actually stored in a field of the table 2. If so, I'm sure this will not work. You need to define a lookup list, either a simple list or via a kookup table. Either of those will do what you want. Go to the field rules of the table and when you have the field in view that you want the lookup list to display, click the lookup tab.

                In other words, if you have a field called 'model' in table 2, right click on table 2, and then click field rules. Click the down arrow to get to the 'model' field and then click the loopup tab. Follow the 'yellow brick road' at that point. This feature works really well.

                I grabbed this from memory (Yeah, I know that can be dangerous) but it's close.

                kenn

                kenn
                TYVM :) kenn

                Knowing what you can achieve will not become reality until you imagine and explore.

                Comment


                • #9
                  RE: Drop Down List Box

                  Check the ui_get_list_array() function

                  How do I use this

                  Comment


                  • #10
                    RE: Drop Down List Box

                    The function is explained in the Xbasic Reference Manual. Check the index to the Manual to find what page it's on.

                    The function displays a list, created from an array which you populate in advance. The Function prompts the user for a selection and returns the choice picked off the list, or a null string if nothing is selected.

                    If you are trying to assist the end user with data entry, by presenting a list from which they 'must' pick, I recommend you use a table lookup field rule instead. It will be much easier for you to implement.

                    later on, when you get more familiar with alpha five you can come back and build a custom lookup form or listbox if you wish.

                    -- tom

                    Comment


                    • #11
                      RE: Drop Down List Box

                      Ray,

                      I agree with Tom. There have been times when a solution was offered and I did not fully grasp it due to my inexperience with A5. Months later, when I want to do the same thing, I search the board and find a thread on the subject. Upon reading the thread, I discover it's a post I made earlier and upon reading the suggestions, I find them easier to understand. (They actually work this time)

                      A5 has numerous ways to do things and I've found that sticking with the easier stuff lowers my frustration level. And, I have more time to work a project towards completion.

                      kenn
                      TYVM :) kenn

                      Knowing what you can achieve will not become reality until you imagine and explore.

                      Comment

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