Radlistbox OnSelectedIndexChanged event is not working under the radgrid view.

[Priyanka]

I have Radlistbox in DetailTables tag of radgrid. I want to used OnSelectedIndexChanged event of radlist box but it wasn't trigged code behind event.

[Vasko]

Hi Priyanka,

Please ensure the ListBox has the AutoPostBack set to true, to trigger the SelectedIndexChanged event: 

<telerik:RadGrid ID="RadGrid1" runat="server" AllowPaging="True" Width="800px"
    OnNeedDataSource="RadGrid1_NeedDataSource"
    OnDetailTableDataBind="RadGrid1_DetailTableDataBind">
    <MasterTableView Name="Orders" AutoGenerateColumns="False" DataKeyNames="OrderID">
        <Columns>
            <telerik:GridNumericColumn DataField="OrderID" DataType="System.Int32"
                FilterControlAltText="Filter OrderID column" HeaderText="OrderID"
                ReadOnly="True" SortExpression="OrderID" UniqueName="OrderID">
            </telerik:GridNumericColumn>
        </Columns>
        <DetailTables>
            <telerik:GridTableView Name="OrderDetails" AutoGenerateColumns="false">
                <Columns>
                    <telerik:GridNumericColumn DataField="OrderID" DataType="System.Int32"
                        FilterControlAltText="Filter OrderID column" HeaderText="OrderID"
                        ReadOnly="True" SortExpression="OrderID" UniqueName="OrderID">
                    </telerik:GridNumericColumn>
                    <telerik:GridTemplateColumn>
                        <ItemTemplate>
                            <telerik:RadListBox runat="server" ID="RadListBoxInGrid" OnSelectedIndexChanged="RadListBoxInGrid_SelectedIndexChanged" AutoPostBack="true">
                                <Items>
                                    <telerik:RadListBoxItem Text="Item 1" />
                                    <telerik:RadListBoxItem Text="Item 2" />
                                    <telerik:RadListBoxItem Text="Item 3" />
                                    <telerik:RadListBoxItem Text="Item 4" />
                                </Items>
                            </telerik:RadListBox>
                        </ItemTemplate>
                    </telerik:GridTemplateColumn>
                </Columns>
            </telerik:GridTableView>
        </DetailTables>
    </MasterTableView>
</telerik:RadGrid>

<telerik:RadListBox runat="server" ID="RadListBox1" OnSelectedIndexChanged="RadListBox1_SelectedIndexChanged" AutoPostBack="true">
    <Items>
        <telerik:RadListBoxItem Text="Item 1" />
        <telerik:RadListBoxItem Text="Item 2" />
        <telerik:RadListBoxItem Text="Item 3" />
        <telerik:RadListBoxItem Text="Item 4" />
    </Items>
</telerik:RadListBox>

protected void RadListBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    int index = RadListBox1.SelectedIndex;
}

protected void RadListBoxInGrid_SelectedIndexChanged(object sender, EventArgs e)
{
    int index = RadListBox1.SelectedIndex;
}

protected void RadGrid1_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
{
    (sender as RadGrid).DataSource = OrdersTable();
}

protected void RadGrid1_DetailTableDataBind(object sender, GridDetailTableDataBindEventArgs e)
{
    if (e.DetailTableView.Name == "OrderDetails")
    {
        GridDataItem parentItem = e.DetailTableView.ParentItem;

        int orderId = (int)parentItem.GetDataKeyValue("OrderID");

        e.DetailTableView.DataSource = OrderDetailsTable().Select(string.Format("OrderID = '{0}'", orderId));
    }
}

private DataTable OrdersTable()
{
    DataTable dt = new DataTable();

    dt.Columns.Add(new DataColumn("OrderID", typeof(int)));

    dt.PrimaryKey = new DataColumn[] { dt.Columns["OrderID"] };

    for (int i = 0; i < 3; i++)
    {
        int index = i + 1;

        DataRow row = dt.NewRow();

        row["OrderID"] = index;

        dt.Rows.Add(row);
    }

    return dt;
}
private DataTable OrderDetailsTable()
{
    DataTable dt = new DataTable();

    dt.Columns.Add(new DataColumn("OrderID", typeof(int)));

    var orders = OrdersTable();

    int itemsPerOrder = 4;

    for (int rowIndex = 0; rowIndex < orders.Rows.Count; rowIndex++)
    {
        DataRow currentOrder = orders.Rows[rowIndex];

        for (int j = 0; j < itemsPerOrder; j++)
        {
            int index = j + 1;

            DataRow row = dt.NewRow();

            row["OrderID"] = currentOrder["OrderID"];

            dt.Rows.Add(row);
        }
    }
    return dt;
}

Regards,
Vasko
Progress Telerik