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Combo box unexpected behavior on a form

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  • Combo box unexpected behavior on a form

    Hello all,

    On my forms I am using a dropdown to constrain the input values of some data fields. In particular the values are foreign keys, and the dropdown has the proper keys and description. I am using that dropdown to populate records in the Invoices table. The dropdown is created by changing the field type to combo box, and the choice of available values come from the corresponding domain table, using the expression

    Value + "|" + str(Invoicestateid)

    The dropdown works fine on a form for the Invoices table, or in a set containing the Invoices table and a mapped table with customers and addresses. The linking between that mapped table and Invoices is one-to-one.

    However, when I add the one-to-many invoicelineitems table to the set with referential integrity set to Cascade Changes/Deletes, and open the form, I find that the drop down does not work. I click on the dropdown and nothing happens (i.e., the dropdown does not open). It does, however, correctly show the text corresponding to the current value in the field.

    But if I remove the referential integrity, the dropdown works as expected.

    What am I missing? Why is the dropdown (whose choices are coming from a totally different linked table) not working when the one-to-many table has its referential integrity set to none?

    I am using SQL backend, where referential integrity is maintained at database level using relationships between tables/fields.

    Do I still need to have referential integrity set in the set, or if I can set it to blank?

    Any help is appreciated.

    Thank you,

    Armando

  • #2
    Re: Combo box unexpected behavior on a form

    I would definitely try it without the referential integrity on the Alpha set.

    What SQL backend are you using?
    Al Buchholz
    Bookwood Systems, LTD
    Weekly QReportBuilder Webinars Thursday 1 pm CST

    Occam's Razor - KISS
    Normalize till it hurts - De-normalize till it works.
    Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
    When we triage a problem it is much easier to read sample systems than to read a mind.
    "Make it as simple as possible, but not simpler."
    Albert Einstein

    http://www.iadn.com/images/media/iadn_member.png

    Comment


    • #3
      Re: Combo box unexpected behavior on a form

      Hi Al,

      I'm using Microsoft Sql Express 2017. What is the downside (if any) of not using Alpha's referential integrity in data-entry forms?

      Thanks,

      Armando

      Comment


      • #4
        Re: Combo box unexpected behavior on a form

        Originally posted by aporta View Post
        Hi Al,

        I'm using Microsoft Sql Express 2017. What is the downside (if any) of not using Alpha's referential integrity in data-entry forms?

        Thanks,

        Armando
        Nothing I expect if the backend database is doing what you need.

        That's a better place for it to happen.

        The Alpha RI is designed for DBF tables, not SQL.
        Al Buchholz
        Bookwood Systems, LTD
        Weekly QReportBuilder Webinars Thursday 1 pm CST

        Occam's Razor - KISS
        Normalize till it hurts - De-normalize till it works.
        Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
        When we triage a problem it is much easier to read sample systems than to read a mind.
        "Make it as simple as possible, but not simpler."
        Albert Einstein

        http://www.iadn.com/images/media/iadn_member.png

        Comment

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