Setting Excel cell value based on another cell value using VBA - excel

Question

I have the following spreadsheet. When ever there is an x in cell B I need to populate the d and e cells in the same row using an equation I have.
if there is no x in the b cell I need to manually enter values into cells d & e.
How do I make my code non-row specific?
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
Dim val As String
val = Range("B3").Value
If val = "x" Then
Range("E3").Value = Range("d2").Value * Range("G2").Value
Range("D3").Value = Range("D2").Value
End If
End Sub

Answer 1

I'm not sure if I understand correctly, but if you have a parameter: row = 3 you can use Range("E" & row) instead of Range("E3").
Put a loop around that where you vary 'row' for the rows you want to modify.
Hope that helps!

Answer 2

You've created a sub procedure around the Worksheet_SelectionChange event. In fact, you require Worksheet_Change and you need to,
disable event handling so you can write new values/formulas to the worksheet without running the Worksheet_Change on top of itself.
loop through each matching cell in Target to compensate for circumstances when Target can be more than a single cell,
add error control.
Rewrite:
Option Explicit
Private Sub Worksheet_Change(ByVal Target As Range)
If Not Intersect(Target, Range("B:B")) Is Nothing Then
On Error GoTo safe_exit
Application.EnableEvents = False
Dim t As Range
For Each t In Intersect(Target, Range("B:B"))
If LCase(t.Value) = "x" Then
'I've made these formulas relative to each target
'you may want to make some absolute references
t.Offset(0, 3) = t.Offset(-1, 2) * t.Offset(-1, 5)
t.Offset(0, 2) = t.Offset(-1, 2)
Else
t.Offset(0, 2).resize(1, 2) = vbnullstring
End If
Next t
End If
safe_exit:
Application.EnableEvents = True
End Sub

Answer 3

Please try below code.
It loop through all non empty rows in column B and check if there is value: x
If so it populate your formulas.
Sub new_sub()
' get last_row of data
last_row = ActiveSheet.UsedRange.Rows.Count
' loop through all rows with data and check if in column B any cell contains value: x
For i = 1 To last_row
' if there is any cell with value: x
' then add below formulas
If Cells(i, 2).Value = "x" Then
' for column E: take value from row above for col D and G and multiple
Range("E" & i).Value = Range("d" & i - 1).Value * Range("G" & i - 1).Value
' for column D: take value from row above
Range("D" & i).Value = Range("D" & i - 1).Value
End If
Next i
End Sub