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Lookup Tables- Dependent Lookup

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  • Lookup Tables- Dependent Lookup

    I am new to Alpha.
    Primary Table: BoatList
    -two fields same as secondary lookup.
    Secondary Lookup Table: Boat-category-type
    Id Category Type
    001 Sail Sloop
    002 Sail Yawl
    003 Sail Catboat
    004 Power Console
    005 Power Cruiser

    In Default Form Primary Table "Boatlist" I have the lookups working but they are not logically connected. Dependent on what has been selected in Category, I
    want only the relevant "types" shown and available.
    If the user changes the "Category" field I want the "type" field to be cleared.

    In Table "Boatlist" in the Field Rules view, on field "type" at the "Lookup" Tab, under "Filters" I have tried this formula to supress display of the non-relevant records in the "Boat-category-type" Table, under filter


    This does not seem to work. Is this function only for "printing". Only one item comes up in the lookup. Any suggestions? How do I clear second field when user changes first?

    Also is this going to translate to a Web database ok?

    Thanks, Rick

  • #2
    Re: Lookup Tables- Dependent Lookup

    Hi Rick,

    Welcome to the world of Alpha.

    What you need here is a Filtered Lookup. This has been asked before and there are many examples on this forum. Some may be in older versions but will still work in V9. Have a good search, reading what was asked and answered will be of great value to you. There will also be some examples for you to download and see what has been suggested.

    Also is this going to translate to a Web database ok?
    I'm afraid not. For the web components that will be whole new ball game, but the logic will stand you in good stead.
    Keith Hubert
    Alpha Guild Member
    KHDB Management Systems
    Skype = keith.hubert

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


    • #3
      Re: Lookup Tables- Dependent Lookup


      You were close. I think it should be
      Category = Boatlist->Category
      Tim Kiebert
      Eagle Creek Citrus
      A complex system that does not work is invariably found to have evolved from a simpler system that worked just fine.


      • #4
        Re: Lookup Tables- Dependent Lookup

        Tim your suggestion seems to work, thank you. I guess the current function is used for printing. -After changing the first field (Category), the second lookup now shows the right choices (after several tries). I am wondering why it seems to take several tries to be showing the reduced list boat "types" of that relate to the selection of the first list boat "category" - sail, power, paddle or row.



        • #5
          Re: Lookup Tables- Dependent Lookup

          I think the problem is, if you go back to the boat "category" field and select some other value, the field "type" value still remains and is incorrect.

          Therefore when the "category" field is not empty, and someone selects a different value for "category", the field "type" value needs to become "blank" or to reset. Or possibly to automatically popup "blank" for selection with the correct values.

          I am wondering how I accomplish this. I am going to do some more searches on filter lookup.



          • #6
            Re: Lookup Tables- Dependent Lookup

            You could do this at the form level or table level in the field rule record events.
            At the form level use the Onchange event of the control holding the Category and use it to set the value of the second control to blank or ""

            This can be done with xbasic or action scripting - category field, action - Set field value
            Tim Kiebert
            Eagle Creek Citrus
            A complex system that does not work is invariably found to have evolved from a simpler system that worked just fine.


            • #7
              Re: Lookup Tables- Dependent Lookup

              Thanks again. This is interesting. There seems to be many ways to accomplish things and being new to it, I have no understanding of the ramifications. Alpha is going to be a black box that you try things against for awhile, I guess. I think I am going to go look at Alpha Sports really hard.