Duplicating Data in Text Box

[G Marshall]

Hello

I have an input form linked to a table. On the form I have a text box for the user to enter a "Scheme Code Number" e.g W355. It is o.k for the user to duplicate this number in the table but if the user enters a number that has already been used I would like a message to appear on screen advising that the number has already been used with the option of entering o.k to continue or no to return to the text box.
If o.k has been clicked then I would need the cursor to move to the next text box on the form.
I realise that this would be an "on input" event procedure but I have no idea how to code the request.
Appreciate any help


Gerald

 

[Tanis]

Add some code to the Before Update event of the Text Box. Something like this.

If DCount("[PrimaryKey]", "TableName", "[PrimaryKey]= '" & Me![TextBoxName] & "'") = 1 Then
MsgBox "The number you have entered is a duplicate"
Me.Undo
Cancel = True
End If

 

[G Marshall]

Hi Tanis
With a little bit of tweaking this has worked perfectly, Many thanks for your help.

Gerald