DropDownList not doing postback

Asch

New member
Joined
Jun 29, 2011
Messages
1
Programming Experience
1-3
I'm using Visual Studio 2005 and ASP. NET 2.0 with this program. This is written in VB.net

Right now, we've got a Gridview that is embedded and databound into another gridview. The 2nd Gridview is hidden by default and expanded by the user. Within the 2nd gridview are several DropDownLists. The problem is that these DropDownLists are not firing the OnSelectedIndexChanged functon nor AutoPostback whenever I change the selecteditem.

I'm curious as to why it is not firing. Thank you.

Gridview1:

VB.NET:
    Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)

        Dim row As GridViewRow = e.Row
        Dim strSort As String = String.Empty
        Dim strCNRNum As String


        ' Make sure we aren't in header/footer rows
        If row.DataItem Is Nothing Then
            Return
        End If

        ' Find Child GridView control
        Dim gv As GridView = New GridView()
        gv = row.FindControl("GridView2")

        If gv.UniqueID = gvUniqueID Then
            gv.EditIndex = gvEditIndex
            ClientScript.RegisterStartupScript(GetType(Page), "Expand", "<SCRIPT LANGUAGE='javascript'>expandcollapse('div" + e.Row.DataItem("CNR_NUM").ToString() & "','one');</script>")
        End If

        ' Prepare the query for Child GridView by passing 
        ' the Customer ID of the parent row
        'Dim dsTemp As SqlDataSource
        'dsTemp = ChildDataSource(e.Row.DataItem("CNR_NUM").ToString, strSort)
        'gv.DataSource = dsTemp
        'gv.DataBind()

        strCNRNum = e.Row.DataItem("CNR_NUM").ToString()

        Dim dt As DataTable = New DataTable()
        Dim con As SqlConnection = New SqlConnection(ConnectionString)

        Try
            con.Open()
            Dim strSQL As String
            strSQL = "select " & _
                        "CS.SID, " & _
                        "CS.CNR_NUM, " & _
                        "CS.STEP_NUM, " & _
                        "CS.SERVER_ID, " & _
                        "S.SERVER_NM, " & _
                        "CS.DATABASE_ID, " & _
                        "D.DATABASE_NM, " & _
                        "CS.CMD_FILE_NM, " & _
                        "CS.EXECUTE_DTTM, " & _
                        "CS.STEP_TYPE_ID, " & _
                        "ST.STEP_TYPE, " & _
                        "ISNULL(CS.LOG_FILE_NM,'') as LOG_FILE_NM " & _
                     "from " & _
                        "dbo.CNR_STEPS CS INNER JOIN dbo.CNR_SERVERS S on CS.SERVER_ID = S.SERVER_ID " & _
                        "INNER JOIN dbo.CNR_DATABASES D ON CS.DATABASE_ID = D.DATABASE_ID " & _
                        "INNER JOIN dbo.CNR_STEP_TYPES ST ON CS.STEP_TYPE_ID = ST.STEP_TYPE_ID " & _
                     "where " & _
                        "CS.CNR_NUM = '" & strCNRNum & "' " & _
                     "order by " & _
                        "CS.STEP_NUM"

            Dim cmd As SqlCommand = New SqlCommand(strSQL, con)
            Dim da As SqlDataAdapter = New SqlDataAdapter(cmd)

            da.Fill(dt)

            If dt.Rows.Count > 0 Then
                gv.DataSource = dt
                gv.DataBind()
            Else
                dt.Rows.Add(dt.NewRow())
                dt.Rows(0)("CNR_NUM") = strCNRNum
                dt.Rows(0)("LOG_FILE_NM") = ""
                gv.DataSource = dt
                gv.DataBind()

                Dim colCount As Integer = gv.Columns.Count
                gv.Rows(0).Cells.Clear()
                gv.Rows(0).Cells.Add(New TableCell())
                gv.Rows(0).Cells(0).ColumnSpan = colCount

                gv.Rows(0).Cells(0).HorizontalAlign = HorizontalAlign.Center
                gv.Rows(0).Cells(0).ForeColor = System.Drawing.Color.Red
                gv.Rows(0).Cells(0).Font.Bold = True

                gv.Rows(0).Cells(0).Text = "No Steps Defined"

            End If
        Catch ex As Exception
            lblMessage.ForeColor = Drawing.Color.Red
            lblMessage.Text = "Error:  " & ex.Message.ToString()
            'ClientScript.RegisterStartupScript(GetType(Page), "Message", "<SCRIPT LANGUAGE='javascript'>alert('" + ex.Message.ToString().Replace("'", "") + "');</script>")
        End Try

    End Sub

ASP code for the 2nd gridview, which is within the first one:

VB.NET:
    <asp:GridView ID="GridView2" AllowPaging="True" AllowSorting="true" Width="100%" Font-Size="Small"  AutoGenerateColumns="false" runat="server" DataKeyNames="CNR_NUM" ShowFooter="true" OnRowEditing = "GridView2_RowEditing"
                                        OnRowCommand = "GridView2_RowCommand"
                                        OnRowDeleting = "GridView2_RowDeleting"
                                        OnRowDeleted = "GridView2_RowDeleted"
                                        OnRowUpdating = "GridView2_RowUpdating"
                                        OnRowUpdated = "GridView2_RowUpdated"
                                        OnRowCancelingEdit = "GridView2_CancelingEdit"
                                        OnRowDatabound="GridView2_RowDataBound"
                                        
                                        CssClass="mGrid"  
                                        PagerStyle-CssClass="pgr"  
                                        >
                                        <HeaderStyle Font-Bold="True" ForeColor="White" />
                                        <Columns>
                                                <asp:TemplateField HeaderText="Step Type">
                                                <ItemTemplate><%#Eval("STEP_TYPE")%></ItemTemplate>
                                                <EditItemTemplate>
                                                    <asp:DropDownList ID="ddl_StepTypes" 
                                                    DataSourceID="ds_StepTypes" 
                                                    SelectedValue='<%# Eval("STEP_TYPE_ID")%>'
                                                    DataTextField="STEP_TYPE" 
                                                    DataValueField="STEP_TYPE_ID"  
                                                    runat="server" 
                                                    Width="100px" 
                                                    Font-Size="X-Small"
                                                    AutoPostBack="true"
                                                    OnSelectedIndexChanged = "ddl_StepTypes_SelectedIndexChanged">
                                                    </asp:DropDownList>
                                                    <label id="lblTest"></label>
                                                    <!--<asp:TextBox ID="txtStepType" Text='<%# Eval("SERVER_ID")%>' runat="server"></asp:TextBox>-->
                                                </EditItemTemplate>
                                                <FooterTemplate>
                                                    <asp:DropDownList DataSourceID="ds_StepTypes"
                                                      DataTextField="STEP_TYPE" DataValueField="STEP_TYPE_ID"  ID="ddl_StepTypes" runat="server" Width="100px" Font-Size="X-Small"></asp:DropDownList>
                                                    <!--<asp:TextBox ID="txtStepType" Text='' runat="server"></asp:TextBox>-->
                                                </FooterTemplate>
                                            </asp:TemplateField>

If any more information is needed, please let me know. Thank you.
 
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