How can I load data into a RadComboBox via AJAX without using Load On Demand?

Question

I have a page containing five RadComboBoxes that all need to populated from a database (via SQL Server stored procedure). Currently they are bound to the data using the OnLoad event, but that causes the page to load slowly. I am required to use other features of the RadComboBox (specifically checkboxes) that, according to Telerik's docs, are not compatible with the built-in LoadOnDemand feature.

How would I mimic the LoadOnDemand feature to reduce the load time of the page?

Thanks!

Answer 1

This is correct, yes, but you still can use the ItemTemplate and put a checkbox element there and use it with Load on Demand.

See the first combobox in this demo:

http://demos.telerik.com/aspnet-ajax/combobox/examples/functionality/multicolumncombo/defaultcs.aspx

It will require some more work from you in order to define the template and then manually get the checked items, but it is not impossible.