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Home > Code Bank > Controls > Find which control caused a postback

Find which control caused a postback

Summary: Pass the page to the function and the control that caused the postback will be returned from the function

Public Function GetPostBackControl(ByVal page As System.Web.UI.Page) As System.Web.UI.Control
        ' Find which control caused the postback
        Dim control As Control = Nothing
        Dim ctrlname As String = page.Request.Params("__EVENTTARGET")
        If Not (ctrlname Is Nothing) AndAlso Not (ctrlname = String.Empty) Then
            control = page.FindControl(ctrlname)
        Else
            Dim ctrlStr As String = String.Empty
            Dim c As Control = Nothing
            For Each ctl As String In page.Request.Form
                If ctl.EndsWith(".x") OrElse ctl.EndsWith(".y") Then
                    ctrlStr = ctl.Substring(0, ctl.Length - 2)
                    c = page.FindControl(ctrlStr)
                Else
                    c = page.FindControl(ctl)
                End If
                If TypeOf c Is System.Web.UI.WebControls.Button OrElse TypeOf c Is System.Web.UI.WebControls.ImageButton Then
                    control = c
                    ' break
                End If
            Next
        End If
        Return control
    End Function

Posted on 15/03/2007 06:35:06