Virtual Scrolling using ObjectDataSource

[Digifox]

Is it possible to get Virtual Scrolling going using ObjectDataSource? I haven't been able to find any good examples except for those on the demo-site (http://demos.telerik.com/aspnet-ajax/dropdownlist/examples/functionality/virtualscrolling/defaultcs.aspx). Unfortunately, the DropDownList doesn't seem to provide the ObjectDataSource with values for "StartIndex" and "ItemsCount" as per the WebService-datasource example.

Below is a simple example, describing the desired scenario. The Facade is in place and works well with other types of solutions, e.g. paging a Grid using an ObjectDataSource.

<asp:ObjectDataSource ID="ODSNotifications" runat="server"
        TypeName="NotificationsFacade"
        SelectMethod="Get"
        OnSelecting="ODSNotifications_Selecting"
        EnablePaging="true"
        SelectCountMethod="GetCount"
        StartRowIndexParameterName="StartIndex"
        MaximumRowsParameterName="ItemsCount">
        <SelectParameters>
            <asp:Parameter Name="userId" Type="Int32" />
            <asp:Parameter Name="fromDate" Type="DateTime" />
        </SelectParameters>
    </asp:ObjectDataSource>

    <telerik:RadDropDownList ID="RDDLNotifications" runat="server"
        DataSourceID="ODSNotifications"
        CssClass="RDDLNotifications"
        DataValueField="Title"
        DataTextField="Id"
        OnItemDataBound="RDDLNotifications_ItemDataBound"
        DropDownWidth="200px"
        DropDownHeight="100px"
        EnableVirtualScrolling="true">
        <ItemTemplate>
            <asp:Panel ID="PNotification" runat="server" CssClass="w_n_outer" onclick="StopPropagation(event);">
                <div class="w_n_inner">
                    <asp:Label ID="LType" runat="server" Font-Size="0.8em" />
                    <br />
                    <asp:Label ID="LTitle" runat="server" Font-Bold="true" />
                    <br />
                    <asp:Label ID="LBody" runat="server" />
                </div>
            </asp:Panel>
        </ItemTemplate>
    </telerik:RadDropDownList>

Any help would be greatly appreciated!

[Nencho]

Hello Andreas,

I am afraid that currently such implementation is not possible, since as you had well observe the ItemsCount and StartIndex are the needed parameters, for the implementation of the asynchronous loading of the Items (when the Virtual Scrolling is enabled. )

Regards,
Nencho
Telerik