How can I "remind" users to fill in cells on a worksheet

Hello: I have a set of cells on a worksheet called "Docs". The cell range is (B13:C23). When users get taken to this page, they are meant to fill out each of these cells with a value from 0 through 6. My Ques开发者_StackOverflowtion: Is there some code that I can attach to this sheet where, if a user does not fill in a cell with anything (ie. leaves it blank) and tries to leave the sheet or close the workbook, they are somehow reminded to fill it in? Or is there a way to not let them leave the sheet until it's completed? Thanks.. Allan

You can attach a macro to the change event of the form. Excel comes with built in validation but it does not work that well. For instance if someone pastes a value into the cell it does not validate what is pasted.

Start by creating a range by selecting the range of cells to be validated, right click and select "Name a Range". Note that I am testing this with Excel 2007. Say you call your range "InputRange".

Then open the VBA editor and create a procedure for the change event.

Private Sub Worksheet_Change(ByVal Target As Range)
  Dim vrange As Range, cell As Range
  Set vrange = Range("InputRange")
  If Intersect(vrange, Target) Is Nothing Then Exit Sub
  For Each cell In Intersect(vrange, Target)
     If cell.Value < 1 Or cell.Value > 6 Then
        MsgBox "Invalid Entry", vbCritical
        Application.EnableEvents = False
        cell.ClearContents
        cell.Activate
        Application.EnableEvents = True

     End If
  Next cell
End Sub

Note you can attach to any event that suits you.

You could give these cells conditional formatting, making them red if empty.

Try writing a vba macro. Alt + F11 opens the VB Editor. Check out this SO post for VBA tutorials.

There are worksheet and workbook events that you can use. For example, Workbook_BeforeClose or Workbook_SheetChange. If you create methods for those events you can put code inside that checks that the required cells are filled.