How can run the following code on multiple Excel sheets? - windows

Question

I have a code which I would like to use on multiple sheets, except one sheet. But applying the code to alle sheets is also fine.
Here is the code that I would like to adjust. I am have currently applied it to Excel 2011 in OS X , but I would like to use it for Excel 2010 in Windows.
Private Sub Worksheet_Change(ByVal Target As Range)
If Target.Address = "$A$1" Then
Dim the_selection As String
Dim month_in_review As String
the_selection = Sheet1.Range("A1")
Dim Rep As Integer
For Rep = 2 To 379
the_column = GetColumnLetter_ByInteger(Rep)
month_in_review = Sheet1.Range(the_column & "1")
If the_selection = month_in_review Then
Sheet1.Range(the_column & ":" & the_column).EntireColumn.Hidden = False
Else
Sheet1.Range(the_column & ":" & the_column).EntireColumn.Hidden = True
End If
Next Rep
End If
End Sub
In the module I have the following code:
Public Function GetColumnLetter_ByInteger(what_number As Integer) As String
GetColumnLetter_ByInteger = ""
MyColumn_Integer = what_number
If MyColumn_Ineger <= 26 Then
column_letter = ChrW(64 + MyColumn_Integer)
End If
If MyColumn_Integer > 26 Then
column_letter = ChrW(Int((MyColumn_Integer - 1) / 26) + 64) & ChrW(((MyColumn_Integer - 1) Mod 26) + 65)
End If
GetColumnLetter_ByInteger = column_letter
End Function

Answer 1

If you're asking for one sheet to detect the change in cell "A1" and then to hide/unhide columns on multiple sheets then the prior answers to your question will serve you nicely.
If, on the other hand, you're asking to detect a change in cell "A1" on any sheet and then to hide/unhide columns on just the changed sheet, then the code below will work for you. It accesses the Workbook_SheetChanged event at Workbook level.
A few points about your code:
You can reference cells using their integer or address values with the .Cell property, so Sheet1.Cells(1, 1) is the same as Sheet1.Cells(1, "A"). The same applies to the .Columns property. So there's no real need to convert your integer values to a string. See #Florent B's answer for a good example of this.
Wherever possible, minimise looping sheet interactions as these are very time-consuming. So rather than loop through the columns and hide/unhide each one individually, you could assign them to ranges within your loop and then hide/unhide the ranges all in one go at the end of your loop. If you must interact with the sheet on each iteration of your loop, then set the Application.ScreenUpdating property to false before the start of your loop. There's an example of this property in the sample code below.
Put this in your Workbook module:
Private Sub Workbook_SheetChange(ByVal Sh As Object, ByVal Target As Range)
Const TARGET_ADDRESS As String = "A1"
Dim cell As Range
Dim hiddenCols As Range
Dim unhiddenCols As Range
Dim selectedMonth As String
Dim monthInReview As String
Dim c As Integer
'Ignore event if not a target worksheet
If Sh.Name = "Not Wanted" Then Exit Sub
'Ignore event if not in target range
Set cell = Target.Cells(1)
If cell.Address(False, False) <> TARGET_ADDRESS Then Exit Sub
'Criteria met, so handle event
selectedMonth = CStr(cell.Value)
For c = 2 To 379
Set cell = Sh.Cells(1, c)
monthInReview = CStr(cell.Value)
'Add cell to hidden or unhidden ranges
If monthInReview = selectedMonth Then
If unhiddenCols Is Nothing Then
Set unhiddenCols = cell
Else
Set unhiddenCols = Union(unhiddenCols, cell)
End If
Else
If hiddenCols Is Nothing Then
Set hiddenCols = cell
Else
Set hiddenCols = Union(hiddenCols, cell)
End If
End If
Next
'Hide and unhide the cells
Application.ScreenUpdating = False 'not really needed here but given as example
If Not unhiddenCols Is Nothing Then
unhiddenCols.EntireColumn.Hidden = False
End If
If Not hiddenCols Is Nothing Then
hiddenCols.EntireColumn.Hidden = True
End If
Application.ScreenUpdating = True
End Sub

Answer 2

You can use a for each loop to loop through all the Worksheets, and check the worksheet name if it should be skipped. Then apply your code onto the sheet selected.
Something like:
Sub Worksheet_Change(ByVal Target As Range)
If Target.Address = "$A$1" Then
Dim ws As Worksheet
For Each ws In ActiveWorkbook.Worksheets
If ws.Name <> "Skip Sheet" Then
Dim the_selection As String
Dim month_in_review As String
the_selection = ws.Range("A1")
Dim Rep As Integer
For Rep = 2 To 379
the_column = GetColumnLetter_ByInteger(Rep)
month_in_review = ws.Range(the_column & "1")
If the_selection = month_in_review Then
ws.Range(the_column & ":" & the_column).EntireColumn.Hidden = False
Else
ws.Range(the_column & ":" & the_column).EntireColumn.Hidden = True
End If
Next Rep
End If
Next ws
End If
End Sub
I wasn't entirely sure what you wished to achieve, so i put ws in the place of Sheet1.

Answer 3

This example will show/hide the columns in all the other sheets if the first cell of the column match/differ with the cell A1 of the sheet where this code is placed:
Private Sub Worksheet_Change(ByVal Target As Range)
' exit if not cell A1
If Target.row <> 1 Or Target.column <> 1 Then Exit Sub
Dim sheet As Worksheet
Dim the_selection As String
Dim month_in_review As String
Dim column As Integer
the_selection = Target.Value
' iterate all the sheets
For Each sheet In ThisWorkbook.Worksheets
' skip this sheet
If Not sheet Is Me Then
' iterate the columns
For column = 2 To 379
' get the first cell of the column
month_in_review = sheet.Cells(1, column).Value
' hide or show the column if it's a match or not
sheet.Columns(column).Hidden = month_in_review <> the_selection
Next
End If
Next
End Sub