Excel copy rows down to blank cells - vba

Question

I am trying to copy rows that contain data (in cells A, B, C, D) down into the same cells (in the different rows) if the cells are blank. So basically copying the data in the above cells if the preceding cells are empty. The code I have is as follows:
Sub PadOut()
With Range("A2:D300") ' change this
On Error Resume Next
Set aRange = .SpecialCells(xlCellTypeBlanks) 'check for blank cells
On Error Goto 0
If Not aRange Is Nothing Then
aRange.FormulaR1C1 = "=R[-1]C"
.Value = .Value
End If
End With
End Sub
Currently I have it at a set range.. But how can I set so as the range can be expanded (if I didn't know the number of total rows)

Answer 1

Is this what you're trying to achieve? You can change the start row and column number as neccessary. The endCol variable defines the last colulmn to scan through and the endRow loop finds the last used row in the defined column range.
Sub PadOut()
Application.ScreenUpdating = False
Dim startRow As Long
startRow = 2
Dim startCol As Long
startCol = 1
Dim endCol As Long
endCol = 3
With ActiveSheet
Dim row As Long
Dim col As Long
Dim endRow As Long
Dim bottomRow As Long
bottomRow = ActiveSheet.Rows.Count
Dim colEndRow As Long
endRow = 0
For col = startCol To endCol
If (Cells(bottomRow, col).End(xlUp).row > endRow) Then
endRow = Cells(bottomRow, col).End(xlUp).row
End If
Next col
For col = startCol To endCol
For row = startRow + 1 To endRow
If .Cells(row, col).value = "" Then
.Cells(row, col).value = .Cells(row - 1, col).value
End If
Next row
Next col
End With
Application.ScreenUpdating = True
End Sub

Answer 2

Sub PadOut()
lastRow = ActiveSheet.UsedRange.Rows.Count
if cells(lastRow, 1) = "" and cells(lastRow, 2) = "" and cells(lastRow, 3) = "" and cells(lastRow, 4) = "" then
lastRow = WorksheetFunction.Max(cells(lastRow, 1).end(xlup).row, cells(lastRow, 2).end(xlup).row, cells(lastRow, 3).end(xlUp).row, cells(lastRow, 4).end(xlup).row)
end if
With Range("A2:D" & lastRow)
On Error Resume Next
Set aRange = .SpecialCells(xlCellTypeBlanks) 'check for blank cells
On Error Goto 0
If Not aRange Is Nothing Then
aRange.FormulaR1C1 = "=R[-1]C"
.Value = .Value
End If
End With
End Sub

Answer 3

You can get the total number of rows using the following:
numberRows = ActiveSheet.UsedRange.Rows.Count
Then you can set up the range accordingly.

Answer 4

You don't really need VBA for this task.
It can be accomplished with use of the selection page and array filling.
To do this:
Highlight your range, starting with the first row and cell that has blank data you are interested in filling.
Next, press CTRL+G, this will display the "Go To" window, press Special.... Select the "blanks" option and press OK.
This will select all BLANK cells in your range. Then, without clicking (or you will change your selection), type: = {Press UP arrow} then press CTRL + ENTER
Your Data Before // Your Data After