MS Access - Make a field mandatory based on the value of another field in form

Posted on 2011-03-15
Medium Priority
Last Modified: 2013-11-27
I am have a form called APTT and there are two fields - Requirements and Other Explanation.  I want to make the "Other Explanation" mandatory if the person selects "Other" in the "Requirements" field.  I have little knowledge of VBA but I am learning.  How do I do this?
Question by:dcmennealy

Expert Comment

ID: 35144061
If you create a save button you can do something like this. It depends though, how is your form set up - is it bound or unbound? When do you want the event to execute?
Private Sub cbSave_Click()

    If Me.tbRequirements.Value = "Other" And IsNull(Me.tbOtherExplanation.Value) Then
        MsgBox "Other explanation required.", vbCritical
    End If
End Sub

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LVL 21

Assisted Solution

by:Boyd (HiTechCoach) Trimmell, Microsoft Access MVP
Boyd (HiTechCoach) Trimmell, Microsoft Access MVP earned 248 total points
ID: 35144084
Use the form's Before Update  event to perform teh evaluation.

Private Sub Form_BeforeUpdate(Cancel As Integer)

 If Me.txtRequirements = " Other" and IsNull(Me.txtOtherExplanation) Then  
  Msgbox "Other Explanation is mandatory"
  Cancel = True

End If

End Sub

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Accepted Solution

Raland9966 earned 252 total points
ID: 35202103
The previous examples answers your question but checking that the user has filled in all required fields is something you're going to be doing a lot. Here is a little more complex version. Even if you don't use it today it will give you something to build on. The advantage to this is you don't have to specifically write your code for every control you want to be required.

Private Sub Form_BeforeUpdate(Cancel As Integer)
   Dim ctl As Control
   Dim frm As Form
   Set frm = Me.Form
   For Each ctl In frm.Controls
      If ctl.Tag = "Required" Then
         If IsNull(ctl.Value) Or ctl.Value = "" Then
            MsgBox "Other Explanation is mandatory"
            Cancel = True
         End If
      End If
End Sub

You just set the .Tag property of the control to "Required" either staticly if it's required all the time or dynamically based on other controls. In your case you would use this.

Private Sub tbRequirements_AfterUpdate()
   If Me.tbRequirements.Value = "Other" Then
      Me.tbOtherExplanation.Tag = "Required"
      Me.tbOtherExplanation.Tag = ""
   End If
End Sub

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