Finding column based on header then formatting rows - excel

Question

I am attempting to build a loop that searches through headers and finds a contained value, In this case, "Avg". If the value is found it will work down the column and apply a format based on a comparison to another column. I am trying to convert my cell variable in the For loop (Z) into a column address so I can use to control my ws.Cells() value in the next loop.
Any help is greatly appreciated, thanks!!!!
Sub foo()
Dim ws As Worksheet: Set ws = Sheets("Sheet1")
Dim Z As Range
lastRow = ws.Cells(ws.Rows.Count, "I").End(xlUp).Row
For Each Z In Range("I1:BM1").Cells
If InStr(1, Z.Value, "Avg") Then
For i = 2 To lastRow 'loop from row 2 to last
If ws.Cells(i, 8) - ws.Cells(i, Z) < 0 Then
ws.Cells(i, Z).Interior.ColorIndex = 4
End If
Next i
End If
Next Z
End Sub

Answer 1

It's not exactly clear to me what you want - but from the title it appears you want to get the column number based on the header text? If so, this will do that:
Private Function GetColumn(headerName As String) As Integer
Dim col As Integer
GetColumn = 0
For col = 1 To ActiveSheet.UsedRange.Columns.Count
If ActiveSheet.Cells(1, col).Value = headerName Then
GetColumn = col
Exit For
End If
Next col
End Function

Answer 2

Find Header and Format Cells
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' Purpose: In a column range specified by its header,
' highlights the cells matching a condition.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Sub HighlightBelowAverages()
' Define constants.
Const PROC_TITLE As String = "Highlight Below-Averages"
Const COMPARE_COLUMN As String = "H"
Const AVG_SEARCH_COLUMNS As String = "I:BM"
Const AVG_COLUMN_HEADER As String = "Avg"
Const AVG_COLOR_INDEX As Long = 4 ' Bright Green
' Reference the Search range.
Dim wb As Workbook: Set wb = ThisWorkbook ' workbook containing this code
Dim ws As Worksheet: Set ws = wb.Sheets("Sheet1")
Dim srg As Range
' It is NOT assumed that the used range starts in row '1'.
Set srg = Intersect(ws.UsedRange, ws.Range(AVG_SEARCH_COLUMNS))
If srg Is Nothing Then
MsgBox "The Average search columns '" & AVG_SEARCH_COLUMNS _
& "' are not part of the used range.", vbCritical, PROC_TITLE
Exit Sub
End If
' Find the Average header cell.
Dim ahCell As Range
With srg
Set ahCell = .Find(AVG_COLUMN_HEADER, _
.Cells(.Rows.Count, .Columns.Count), xlFormulas, xlWhole, xlByRows)
End With
If ahCell Is Nothing Then
MsgBox "Header '" & AVG_COLUMN_HEADER & "' not found.", _
vbCritical, PROC_TITLE
Exit Sub
End If
' Reference the Average (single-column) range.
Dim afCell As Range: Set afCell = ahCell.Offset(1)
Dim alCell As Range
Set alCell = Intersect(srg.Rows(srg.Rows.Count), ws.Columns(ahCell.Column))
' It IS assumed that the data has one row of headers.
If afCell.Row > alCell.Row Then
MsgBox "No data found.", vbCritical, PROC_TITLE
Exit Sub
End If
Dim arg As Range: Set arg = ws.Range(afCell, alCell)
' Reference the Compare (single-column) range.
Dim crg As Range
' It is NOT assumed that the used range starts in column 'A'.
Set crg = Intersect(arg.EntireRow, ws.Columns(COMPARE_COLUMN))
' Highlight the cells.
Application.ScreenUpdating = False
arg.Interior.ColorIndex = xlNone
Dim aCell As Range, cCell As Range, r As Long
For Each aCell In arg.Cells
r = r + 1
Set cCell = crg.Cells(r)
If cCell.Value < aCell.Value Then ' Compare is less than Average
aCell.Interior.ColorIndex = AVG_COLOR_INDEX
End If
Next aCell
Application.ScreenUpdating = True
' Inform.
MsgBox "Below-averages highlighted.", vbInformation, PROC_TITLE
End Sub