[Solved] Manual OnDemand DataboundListbox

[Dele]

I have wired up my listbox with the "OnDemandManual" virtualization mode, along with a data virtualization item template like so.

<telerikPrimitives:RadDataBoundListBox x:Name="lbJobSearchResults"
                                                   telerikCore:InteractionEffectManager.IsInteractionEnabled="True"
                                                   EmptyContent=" "
                                                   ItemsSource="{Binding JobSearchResults}"
                                                   ItemTemplate="{StaticResource SearchResultListTemplate}"
                                                   SelectedItem="{Binding SelectedJobResult, Mode=TwoWay}"
                                                   DataVirtualizationMode="OnDemandManual">
                <telerikPrimitives:RadDataBoundListBox.DataVirtualizationItemTemplate>
                    <DataTemplate>
                        <Button Margin="-12, 0, -12, 0"
                                Content="load more"
                                HorizontalAlignment="Stretch"
                                x:Name="btnLoadMore"
                                Command="{Binding LoadMoreJobsCommand, Mode=OneWay}" />
                    </DataTemplate>
                </telerikPrimitives:RadDataBoundListBox.DataVirtualizationItemTemplate>

As you can see, I would like to fire off a command when i click on the load more button.  but the command doesn't even seem to be registering.  is this possible via commanding, or do I need to call the command via my code-behind?

[Georgi]

Hi Dele,

Thank you for contacting us.

In order to have the proper DataContext passed to the underlying ContentControl that visualizes the DataVirtualizationItemTemplate , you should also set the DataVirtualizationItemContent property to the view model that contains the command instance:

<telerik:RadDataBoundListBox x:Name="radListBox" DataVirtualizationMode="OnDemandManual" DataVirtualizationItemContent="{Binding}">

Still, this code will not work, because I have found a bug with updating the Content property. I would like to thank you for bringing our attention to this issue. Your Telerik points are updated as a token for our gratitude for your time and feedback.

The bug will be fixed in the next internal build (available within a week or two). Currently you may use a StaticResource binding and set the Command property as a local value of the button.

Once again - thanks for your feedback. Do not hesitate to contact us with any question/problem you may have with our tools.

All the best,
Georgi
the Telerik team

[Dele]

Thanks for the info Georgi.

I already have a workaround, but will look forward to when this is available.