TreeList - Define Id of root level items?

[Jason]

I am using a TreeList with advanced binding with NeedDataSource event handling.

My data does not have any nodes with null / zero to define the root level nodes.

I have seen reference in other threads to settings a 'DefaultValue' to define root nodes but cannot see how to do this in documentation.

 

How do I display data when I do not have 0 / null root level Id's?

Eg. My root level node may be '1'. How do I configure the TreeList to recognize this?

 

Thanks

Jason

[Eyup]

Hi Jason,

You can check the explanation provided in the following post:
http://www.telerik.com/forums/no-records-to-display-959da9677068#5b--hX0EhkCIesI2PdyWNw

To summarize, the RadTreeList needs its parent items to have NULL values if the corresponding DataField is of a nullable type. If for example it is non-nullable long, then the expected value is 0:
http://www.telerik.com/forums/telerik-treelist-needdatasource-doesn-t-load-data#sycZkjXC_Eie4BZGAeHYag

I'm afraid this cannot be configured manually in the RadTreeList for ASP.NET AJAX.

I hope the clarification was helpful.

Regards,
Eyup
Progress Telerik

[Jason]

Thanks for clarifying.

I understand the need for parent items to have NULL values.

My work around was to make a dummy 'root' level item with id of NULL as I cannot change the existing data.

Thanks

Jason