[vba] Looping through all rows in a table column, Excel-VBA

I'm currently working on a data set which is formatted as a table, with headers. What I need to do is cycle through all cells in a specific column and change the contents. Through research on MSDN I came up with the following for loop

for i = 1 to NumRows
    Cells(i,23).Value = "PHEV"
next i

So this would change all the cells in column 23 to read "PHEV". However, I do not build the table I'm working with myself, so I can't guarantee that the column I'm interested in will be column 23.

I'd like to implement something similar to the following:

for i = 1 to NumRows
    Cells(i,[@[columnHeader]]).Value = "PHEV"
next i

Of course, I know that that syntax is incorrect, but hopefully it sufficiently illustrates my goal.

Since none of the above answers helped me with my problem, here my solution to extract a certain (named) column from each row.

I convert a table into text using the values of some named columns (Yes, No, Maybe) within the named Excel table myTable on the tab mySheet using the following (Excel) VBA snippet:

Function Table2text()
    Dim NumRows, i As Integer
    Dim rngTab As Range
    Set rngTab = ThisWorkbook.Worksheets("mySheet").Range("myTable")
    ' For each row, convert the named columns into an enumeration
    For i = 1 To rngTab.Rows.Count
        Table2text= Table2text & "- Yes:"   & Range("myTable[Yes]")(i).Value & Chr(10)
        Table2text= Table2text & "- No: "   & Range("myTable[No]")(i).Value & Chr(10)
        Table2text= Table2text & "- Maybe: "& Range("myTable[Maybe]")(i).Value & Chr(10) & Chr(10)
    Next i
  ' Finalize return value 
  Table2text = Table2text & Chr(10)  
End Function

We define a range rngTab over which we loop. The trick is to use Range("myTable[col]")(i) to extract the entry of column col in row i.

You can find the last column of table and then fill the cell by looping throught it.

Sub test()
    Dim lastCol As Long, i As Integer
    lastCol = Range("AZ1").End(xlToLeft).Column
        For i = 1 To lastCol
            Cells(1, i).Value = "PHEV"
        Next
End Sub

Assuming that your table is called 'Table1' and the column you need is 'Column' you can try this:

for i = 1 to Range("Table1").Rows.Count
   Range("Table1[Column]")(i)="PHEV"
next i

If you know the header name, you can find the column based on that:

Option Explicit

Public Sub changeData()
    Application.ScreenUpdating = False ' faster for modifying values on sheet

    Dim header As String
    Dim numRows As Long
    Dim col As Long
    Dim c As Excel.Range

    header = "this one" ' header name to find

    Set c = ActiveSheet.Range("1:1").Find(header, LookIn:=xlValues)
    If Not c Is Nothing Then
        col = c.Column
    Else
        ' can't work with it
        Exit Sub
    End If

    numRows = 50 ' (whatever this is in your code)

    With ActiveSheet
        .Range(.Cells(2, col), .Cells(numRows, col)).Value = "PHEV"
    End With

    Application.ScreenUpdating = True ' reset
End Sub

I came across the same problem but no forum could help me, after some minutes I came out with an idea:

match(ColumnHeader,Table1[#Headers],0)

This will return you the number.

If this is in fact a ListObject table (Insert Table from the ribbon) then you can use the table's .DataBodyRange object to get the number of rows and columns. This ignores the header row.

Sub TableTest()

Dim tbl As ListObject
Dim tRows As Long
Dim tCols As Long

Set tbl = ActiveSheet.ListObjects("Table1")  '## modify to your table name.

With tbl.DataBodyRange
    tRows = .Rows.Count
    tCols = .Columns.Count
End With

MsgBox tbl.Name & " contains " & tRows & " rows and " & tCols & " columns.", vbInformation

End Sub

If you need to use the header row, instead of using tbl.DataBodyRange just use tbl.Range.

You can loop through the cells of any column in a table by knowing just its name and not its position. If the table is in sheet1 of the workbook:

Dim rngCol as Range
Dim cl as Range
Set rngCol = Sheet1.Range("TableName[ColumnName]")
For Each cl in rngCol
    cl.Value = "PHEV"
Next cl

The code above will loop through the data values only, excluding the header row and the totals row. It is not necessary to specify the number of rows in the table.

Use this to find the location of any column in a table by its column name:

Dim colNum as Long
colNum = Range("TableName[Column name to search for]").Column

This returns the numeric position of a column in the table.

Assuming your table is called "Table1" and your column is called "Column1" then:

For i = 1 To ListObjects("Table1").ListRows.Count
    ListObjects("Table1").ListColumns("Column1").DataBodyRange(i) = "PHEV"
Next i