excel VBA run macro automatically whenever a cell is changed

Question

Is there a simple way to get Excel to automatically execute a macro whenever a cell is changed?

The cell in question would be in Worksheet("BigBoard").Range("D2")

What I thought would be a simple Google inquiry is proving to be more complicated - every sample involved intersects (whatever those are) or color formatting or any other number of things that appear to be irrelevant.

Answer 1

Yes, this is possible by using worksheet events:

In the Visual Basic Editor open the worksheet you're interested in (i.e. "BigBoard") by double clicking on the name of the worksheet in the tree at the top left. Place the following code in the module:

Private Sub Worksheet_Change(ByVal Target As Range)     If Intersect(Target, Me.Range("D2")) Is Nothing Then Exit Sub         Application.EnableEvents = False 'to prevent endless loop         On Error Goto Finalize 'to re-enable the events               MsgBox "You changed THE CELL!"     End If Finalize:             Application.EnableEvents = True End Sub 

Answer 2

Another option is

Private Sub Worksheet_Change(ByVal Target As Range)     IF Target.Address = "$D$2" Then         MsgBox("Cell D2 Has Changed.")     End If End Sub 

I believe this uses fewer resources than Intersect, which will be helpful if your worksheet changes a lot.