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  1. #1
    New.User is offline Advanced Beginner
    Windows 10 Access 2010 64bit
    Join Date
    Apr 2018
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    37

    Prevent Duplicates From one listbox to another

    I have two listboxes viz. listComponents and listAdditions with a button to add or double click on the items. What I am looking for is a code where in the listAdditions should not populate duplicate items. If an item already exists and user presses the button he must get a pop up mesg saying "item already exists".


    Any help with the coding will be appreciated.

    Regards
    New.User

  2. #2
    isladogs's Avatar
    isladogs is offline MVP / VIP
    Windows 10 Access 2010 32bit
    Join Date
    Jan 2014
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    Somerset, UK
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    5,458
    Use an If clause with a DLookup similar to this

    Code:
    If Nz(DLookup(fieldname, tablename, criteria),"")<>"" Then
        MsgBox "This item already exists"
    End If
    Your criteria would be whatever selection has just been made

    HTH
    Last edited by isladogs; 04-12-2018 at 02:57 AM. Reason: Added text
    Colin, MVP 2022, Website, email
    The more I learn, the more I know I don't know. When I don't know, I keep quiet!
    If I don't know that I don't know, I don't know whether to answer

  3. #3
    New.User is offline Advanced Beginner
    Windows 10 Access 2010 64bit
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    Apr 2018
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    I am a bit allergetic to Dlook up as I always make mistake and at the end of the day i start to debug the error. Is there a simpler way?

  4. #4
    isladogs's Avatar
    isladogs is offline MVP / VIP
    Windows 10 Access 2010 32bit
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    I suggested that as the simplest method.
    An alternative would be to use a count query and look for a count >0 but its different rather than easier.

    Usually any issues with DLookups are to do with getting any delimiters correct
    Its worth trying to learn how to do things like this as it will make your database much more powerful

    Why not try it and post your efforts if you have issues
    Colin, MVP 2022, Website, email
    The more I learn, the more I know I don't know. When I don't know, I keep quiet!
    If I don't know that I don't know, I don't know whether to answer

  5. #5
    New.User is offline Advanced Beginner
    Windows 10 Access 2010 64bit
    Join Date
    Apr 2018
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    37
    Yeah, you are right. I will give it a try and post if i come up with any issues. Thank you RIdders.

Please reply to this thread with any new information or opinions.

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