onbeforeunload Event
Occurs before unloading a page in Microsoft FrontPage.
expression.onbeforeunload
expression Required. An expression that returns one of the objects in the Applies To list, which has been declared using the WithEvents keyword in a class module.
Example
The following example displays a message if the active document has been modified since it was last saved, and then saves the document at the user's request. This example must be placed in a class module, and it assumes that you have declared in the General Declarations section of a class module an FPHTMLWindow2 object variable called "objWindow" using the WithEvents keyword.
Private Sub objWindow_onbeforeunload()
Dim intResponse As Integer
Dim objDoc As FPHTMLDocument
Set objDoc = objWindow.Document
If objDoc.IsDirty = True Then
intResponse = MsgBox("Do you want to save " & _
"the page before you close it?", vbYesNo)
If intResponse = vbYes Then
objDoc.Save False
End If
End If
End Sub