With the next Telerik.Web.UI service pack you will be able to specify your own template for filtering in grid template columns:
and using the grid powerful client-side API you can tell the grid to filter specified data source according to selected conditions:
The result: Easy and powerful filtering customization in less than a minute!
I've used EnityDataSource for my demo connected to Northwind Customers table (and distinct Country from Customers for the combo) and all operations are applied directly to the data-base server without need to write any code:
[Live | Download]
Vladimir Enchev is Director of Engineering, Native Mobile UI & Frameworks
Copyright © 2016, Progress Software Corporation and/or its subsidiaries or affiliates. All Rights Reserved.
Progress, Telerik, and certain product names used herein are trademarks or registered trademarks of Progress Software Corporation and/or one of its subsidiaries or affiliates in the U.S. and/or other countries. See Trademarks or appropriate markings.