Excel help to define a mandatory cell

I'm using Microsoft office 2003 and in excel I want to know if there is a way to make a field mandatory before moving to the next field kind of like it is done in Access.
centurian102Asked:
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gtglonerCommented:
Paste this code in Sheet1 (or whatever sheet you want this to happen) of the VBA environment window. This will prompt the user to enter a value in Cell A1 if another cell is selected with A1 being empty:

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
 If Range("A1").Value = "" Then
  MsgBox ("You must enter a value for this cell")
 End If
End Sub
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gtglonerCommented:
Here is a slight improvement on my previous code:

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
 If Range("A1").Value = "" Then
   Range("A1").Select
   MsgBox ("You must enter a value for Cell A1")
 End If
End Sub
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centurian102Author Commented:
Can I choose this for multiple ranges? e.g. D9 through D15, I9 through I16, D20 through D26 and I20 through I26.
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gtglonerCommented:
Here is how to do it for your first range in a sheet. I haven't figured out how to get this to work for multiple ranges in the same sheet:

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
    For i = 9 To 15
        If Range("D" & i).Value = "" Then
         Range("D9:D15").Select
        End If
    Next i
End Sub
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gtglonerCommented:
If a cell within this range is empty and the user tries to select a cell outside of this range, the range will be autoselected and remain so until the entire range is filled with some kind of character(s). To navigate through this range, the user has to click the Enter key until he gets to the cell that has nothing in it, then fill it with something. After all cells within this range have at least one character in it, the user will be able to navigate to some other cell(s) outside this range.
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