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Edit-Combo list lookup

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  • Edit-Combo list lookup


    I'm Trying to use an Edit-Combo list to enforce a child -> Parent Link between two tables, 'Job' is the child and 'Contractor' is the parent.

    My Job table starts off with the Contractor primary key set to Null when a new Job record is created so when I want to link the tables together in a job allocation screen I use an SQL query with a LEFT OUTER JOIN which will still select all jobs even where the contractor is null.

    I can then use the Edit-Combo list lookup on in the grid to show the contractor (which also returns the contractorID primary key) list but I want to restrict the user to this list using the 'User must select from list' option. Fine so far.

    I THEN ALSO want to allow the user to be able to go back and unallocate the contractor, i.e. set back to null but I cant see a way to do this once a contractor has been selected using the Edit-Combo List. Have I missed something?


  • #2
    Re: Edit-Combo list lookup

    are you saying that you can only select from the editcombo ONCE or that there is no other choice...
    NWCOPRO: Nuisance Wildlife Control Software My Application: "Without forgetting, we would have no memory at what was I saying?"


    • #3
      Re: Edit-Combo list lookup

      Hi Charles,

      Thanks for the reply, I played a bit more with this and I think I managed to solve the problem. The field I was returning the data into in the detail view was the ContractorName field from the contractor table and (also the ContractorID Primary key). The Lookup which was set to 'User must select from List'. I unbound the ContractorName on the grid which then allowed me to set to blank. I then performed a test in the CanUpdateRecord Server-Side Events to test if the name was blank and if true, set the contractorID to 0.

      Hope this makes sense.



      • #4
        Re: Edit-Combo list lookup

        Originally posted by trickytrees View Post
        Hi Charles,

        I unbound the ContractorName on the grid which then allowed me to set to blank. I then performed a test in the CanUpdateRecord Server-Side Events to test if the name was blank and if true, set the contractorID to 0.

        Hope this makes sense.

        Hi Kevin,

        It's a while ago, but I'm finding it hard to find a way for users to 'unselect' a field from a combo box. Once they've made a selection, they're stuck as there's no 'if no selection' option as there is with dropdown boxes. (I can't use another cascading ddb as I a;ready have one in the grid - and you're only allowed one parent!).

        Can you elaborate on 'unbound the [field] on the grid', and give me an idea of teh code you wrote in the Can Update Record please? I've got away with no code so far - this may be the first!