Attach Javascript in ASP.NET

I want to attached a Javascript in File control button. I want to use Javascript script to display a message on label control before file is uploading to the server. However, it doesn't work. Any idea ? Is there a way to debug the logic in Javascript ??


    <asp:Label
        id="lblMessage"  
           Runat="server" EnableViewState="False" Font-Bold="true" />  

Protected Sub btnAdd_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnAdd.Click
        Dim ScriptStr As String
        'ScriptStr = "<script language=""JavaScript"">" & _
        '           "alert(""Upload in progress..."")" & _
        '          "</script>"

        ScriptStr = "<script language=""JavaScript"">" & _
                   "document.GetElementById(""lblMessage"")" & _
                   " = ""Uploading..."" </script>"

        ClientScript.RegisterStartupScript(Me.GetType, "test", ScriptStr)


        'Upload file
        If Not FolderWriteAccess() Then
            Exit Sub
        End If

        If (upFile.HasFile) Then
            ' btnAdd.Attributes.Add("OnClick", "test")
            Try
                Dim filePath As String = strDirs.Text & "/" & upFile.FileName
                upFile.SaveAs(filePath)

                BindGridV(strDirs.Text)
                '  Me.ShowSucessMsg("File has been added succesfully !!!")

            Catch ex As Exception
                Me.ShowFailMsg(ex.Message)
            End Try

        End If

    End SubStart Free Trial