VBA trigger macro on cell value change - vba

Question

This should be simple. When the value of a cell changes I want to trigger some VBA code. The cell (D3) is a calculation from two other cells =B3*C3. I have attempted 2 approaches:
Private Sub Worksheet_Change(ByVal Target As Range)
If Target.Column = 4 And Target.Row = 3 Then
MsgBox "There was a change in cell D3"
End If
End Sub
Since the cell is a calculation this is not triggered when the value changes, because the calculation remains the same. I also tried:
Private Sub Worksheet_Calculate()
MsgBox "There was a calculation"
End Sub
But I have multiple calculations on the sheet and it triggers multiple times. Is there a way I can identify which calculation changed on the calculation event? Or is there another way I can track when D3 changes?

Answer 1

Could you try something like this? Change the formula to =D3AlertOnChange(B3*C3).
Private D3OldVal As Variant
Public Function D3AlertOnChange(val)
If val <> D3OldVal Then MsgBox "Value changed!"
D3OldVal = val
D3AlertOnChange = val
End Function

Answer 2

Or try
Private Sub Worksheet_Change(ByVal Target As Range)
Dim numdependences As Integer
On Error Resume Next
HasDependents = Target.Dependents.Count
If Err = 0 Then
If InStr(Target.Dependents.Address, "$D$3") <> 0 Then
MsgBox "change"
End If
End If
On Error GoTo 0
End Sub
You need the error control in case you change a cell that has not dependents.

Answer 3

try this:
Sub Worksheet_Change(ByVal Target As Range)
If Not Intersect(Target, Target.Worksheet.Range("B1")) Is Nothing Then
Call macro
End If
End Sub
looks for a change in value of cell B1, then executes "macro"

Answer 4

If you are only looking at if the Worksheet_Change then it will count a change for anything entered even if it is the same as the previous value. To overcome this I use a Public variable to capture the starting value and compare it.
This is my code to do this. It also allows you omit parts of the worksheet or you can use it to evaluate every cell in the worksheet.
Place this code in the Worksheet.
Public TargetVal As String 'This is the value of a cell when it is selected
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
If Target.Cells.CountLarge > 1 Then 'If more then one cell is selected do not save TargetVal. CountLarge is used to protect from overflow if all cells are selected.
GoTo EXITNOW
Else
TargetVal = Target 'This sets the value of the TargetVal variable when a cell is selected
End If
EXITNOW:
End Sub
Sub Worksheet_Change(ByVal Target As Range)
'When a cell is modified this will evaluate if the value in the cell value has changed.
'For example if a cell is entered and enter is pressed the value is still evaluated
'We don't want to count it as a change if the value hasn't actually changed
Dim ColumnNumber As Integer
Dim RowNumber As Integer
Dim ColumnLetter As String
'---------------------
'GET CURRENT CELL INFO
'---------------------
ColumnNumber = Target.Column
RowNumber = Target.Row
ColumnLetter = Split(Target.Address, "$")(1)
'---------------------
'DEFINE NO ACTION PARAMETERS
' IF CELL CHANGED IS IN NO ACTION RANGE, EXIT CODE NOW FOR PERFORMANCE IMPROVEMENT OR TO NOT TAKE ACTION
'---------------------
If ColumnNumber <> 4 Then 'This would exempt anything not in Column 4
GoTo EXITNOW
ElseIf RowNumber <> 3 Then 'This would exempt anything not in Row 3
GoTo EXITNOW
'Add Attional ElseIf statements as needed
'ElseIf ColumnNumber > 25 Then
'GoTo EXITNOW
End If
'---------------------
'EVALUATE IF CELL VALUE HAS CHANGED
'---------------------
Debug.Print "---------------------------------------------------------"
Debug.Print "Cell: " & ColumnLetter & RowNumber & " Starting Value: " & TargetVal & " | New Value: " & Target
If Target = TargetVal Then
Debug.Print " No Change"
'CALL MACRO, FUNCTION, or ADD CODE HERE TO DO SOMETHING IF NOT CHANGED
Else
Debug.Print " Cell Value has Changed"
'CALL MACRO, FUNCTION, or ADD CODE HERE TO DO SOMETHING IF CHANGED
End If
Debug.Print "---------------------------------------------------------"
EXITNOW:
End Sub