Filter using RadComboBox

[Keith]

Hi

I'm trying to implement a filter using the RadComboBox but implementing the type-ahead functionality as shown here which brings back a subset of matching entries from a table of around 13,000 rows. Unfortunately I cannot get this to work when used as a custom template within the DataFilter control. I presume because the way it's implemented would mean having two datacontexts. Do you have any sample code showing how to implement this functionality?

Thanks
Keith

[Rossen Hristov]

Hi Keith Pilkington,

Are you referring the combo that holds the item properties (the left one) or an editor combo?

All the best,
Ross
the Telerik team

[Keith]

Hi Ross

Sorry I should've explained better. I'd like the type-ahead functionality on the editor combo. I've so far implemented this as a custom editor template but cannot get the newly selected / typed value to be recognised by the DataFilter control.

Thanks
Keith

[Rossen Hristov]

Hi Keith Pilkington,

You have to bind the combo to a special property on the ViewModel called Value.

For example:

<DataTemplate x:Key="NameFilterEditorTemplate">
                <telerik:RadComboBox SelectedValue="{Binding Value, Mode=TwoWay, FallbackValue=null}"
                                     MinWidth="100"/>
</DataTemplate>

This online example does something similar. Look for the NameFilterEditorTemplate. It uses a combo instead of a TextBox.

I hope this helps. Let me know if there are problems.

Regards,
Ross
the Telerik team

[Keith]

Hi Ross

I'd used that example initially to create the templates and I can see that I need to bind to the Value property but the problem is that to make the type-ahead work the combo box needs to be bound to the database query rather than pre-populated with a list of values (as per the example) . I obviously can't get the datafilter to bind to two contexts so am a bit stuck in implementing the type-ahead combo functionality. I've  based the combo on Valeri's blog as found here: http://blogs.telerik.com/valerihristov/posts/08-12-04/auto-complete_combobox_with_wcf_service_and_radcontrols_for_silverlight.aspx. 

Any help / ideas would be much appreciated.

Thanks
Keith

[Rossen Hristov]

Hello Keith Pilkington,

You can try attaching to the EditorCreated event like demonstrated in the example. In the event handler, cast the editor to your type, i.e. RadComboBox and set anything as the ItemsSource. In other words -- you will have a reference to the combo-box so you can perform anything on it. This is demonstrated in the example. Please, examine it.

I hope this helps.

Greetings,
Ross
the Telerik team