Find First Empty Cell by Looping
Empty
- Except looping through cells, there are various more or less reliable ways to do it.
- If there are hidden rows or columns, many of them will not work.
- Even worse, if the worksheet is filtered, probably most of them will not work.
The Basic Loop
- If you loop through the cells and test each one of them, you will surely get the correct result.
Function RefFirstEmptyCellInColumnBasic( _
ByVal FirstCell As Range) _
As Range
' Validate the given range ('FirstCell').
If FirstCell Is Nothing Then Exit Function
' Create a reference to the Column Range ('crg').
With FirstCell.Cells(1)
Dim crg As Range: Set crg = .Resize(.Worksheet.Rows.Count - .Row + 1)
End With
' Loop.
Dim cCell As Range
' Loop through the cells of the Column Range...
For Each cCell In crg.Cells
' ... until an empty cell is found.
If IsEmpty(cCell) Then
' Create a reference to the current cell.
Set RefFirstEmptyCellInColumnBasic = cCell
Exit Function
End If
Next cCell
End Function
- The issue is that it may take a long time. It will 'behave' for a few thousand rows but e.g. if the first empty cell is the last cell in the column, the previous code takes 'forever' (
5s
) on my machine.
Loop in Memory (Array)
- To remedy this, you can introduce an array into the previous code which will reduce the execution time ten times (
0.5s
). (Note that it will roughly take 0.05s
each time for just writing the values to the array.)
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' Purpose: Creates a reference to the top-most empty cell
' in the one-column range from the first cell of a range
' ('FirstCell') through the last cell in its column.
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Function RefFirstEmptyCellInColumn( _
ByVal FirstCell As Range) _
As Range
' Validate the given range ('FirstCell').
If FirstCell Is Nothing Then Exit Function
' Create a reference to the Column Range ('crg').
With FirstCell.Cells(1)
Dim crg As Range: Set crg = .Resize(.Worksheet.Rows.Count - .Row + 1)
End With
' Write the values from the Column Range to the Column Data Array ('cData').
Dim cData As Variant
If crg.Rows.Count = 1 Then ' only one cell
ReDim cData(1 To 1, 1 To 1): cData(1, 1) = crg.Value
Else
cData = crg.Value
End If
' Loop.
Dim r As Long
' Loop through the elements of the Column Data Array...
For r = 1 To UBound(cData, 1)
' ... until an empty value is found.
If IsEmpty(cData(r, 1)) Then
' Create a reference to the r-th cell of the Column Range.
Set RefFirstEmptyCellInColumn = crg.Cells(r)
Exit Function
End If
Next r
End Function
The Test
- To test the previous you can do the following.
Sub RefFirstEmptyCellInColumnTEST()
Dim ws As Worksheet: Set ws = ActiveSheet
Dim fCell As Range: Set fCell = ws.Range("A3")
' Empty
Dim feCell As Range: Set feCell = RefFirstEmptyCellInColumn(fCell)
If Not feCell Is Nothing Then
Debug.Print feCell.Address(0, 0)
End If
End Sub
Blank
- You can do the same for blank cells i.e. empty cells or cells containing a single quote (') or cells containing formulas evaluating to
""
. Note that cells containing spaces are neither blank nor empty.
Function RefFirstBlankCellInColumnBasic( _
ByVal FirstCell As Range) _
As Range ' (Empty, ="" and ')
' Validate the given range ('FirstCell').
If FirstCell Is Nothing Then Exit Function
' Create a reference to the Column Range ('crg').
With FirstCell.Cells(1)
Dim crg As Range: Set crg = .Resize(.Worksheet.Rows.Count - .Row + 1)
End With
' Loop.
Dim cCell As Range
' Loop through the cells of the Column Range...
For Each cCell In crg.Cells
' (exclude cell containing error value)
If Not IsError(cCell) Then
' ... until a blank cell is found.
If Len(cCell.Value) = 0 Then
' Create a reference to the current cell.
Set RefFirstBlankCellInColumnBasic = cCell
Exit Function
End If
End If
Next cCell
End Function
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' Purpose: Creates a reference to the top-most blank cell
' in the one-column range from the first cell of a range
' ('FirstCell') through the last cell in its column.
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Function RefFirstBlankCellInColumn( _
ByVal FirstCell As Range) _
As Range ' (Empty, ="" and ')
' Validate the given range ('FirstCell').
If FirstCell Is Nothing Then Exit Function
' Create a reference to the Column Range ('crg').
With FirstCell.Cells(1)
Dim crg As Range: Set crg = .Resize(.Worksheet.Rows.Count - .Row + 1)
End With
' Write the values from the Column Range to the Column Data Array ('cData').
Dim cData As Variant
If crg.Rows.Count = 1 Then ' only one cell
ReDim cData(1 To 1, 1 To 1): cData(1, 1) = crg.Value
Else
cData = crg.Value
End If
' Loop.
Dim r As Long
' Loop through the elements of the Column Data Array...
For r = 1 To UBound(cData, 1)
' (exclude error values)
If Not IsError(cData(r, 1)) Then
' ... until a blank is found.
If Len(cData(r, 1)) = 0 Then
' Create a reference to the r-th cell of the Column Range.
Set RefFirstBlankCellInColumn = crg.Cells(r)
Exit Function
End If
End If
Next r
End Function
Sub RefFirstBlankCellInColumnTEST()
Dim ws As Worksheet: Set ws = ActiveSheet
Dim fCell As Range: Set fCell = ws.Range("A3")
' Blank
Dim fbCell As Range: Set fbCell = RefFirstBlankCellInColumn(fCell)
If Not fbCell Is Nothing Then
Debug.Print fbCell.Address(0, 0)
End If
End Sub