Binding to OData

As from Q3 2011, RadComboBox supports binding to an OData service.

The Open Data Protocol (OData) is an open web protocol for querying and updating data. The protocol allows the consumers to query data over an HTTP protocol and get the result back in formats like JSONP and plain XML, including data pagination, ordering, or filtering.

In its current state, RadComboBox supports only data paging.

Flat OData Binding

Flat OData Binding means binding to a non-hierarchical data. Here is an example which demonstrates how to perform the OData binding on RadComboBox using the RadODataDataSource control.

Set the following properties:

• Set the EnableLoadOnDemand property to true.
• Set the ODataDataSourceID property to the ID of the RadODataDataSource component.
• Set the DataModelID property to the ID of the data Model defined in the RadODataDataSource component.
• Set the DataTextField property to the name of a data source field to be mapped to the ComboBoxItem Text property.
• Set the DataValueField property to the name of a data source field to be mapped to the ComboBoxItem Value property.

Markup

ASPNET

<telerik:RadComboBox RenderMode="Lightweight" ID="RadComboBox1" runat="server" EnableLoadOnDemand="true"
	ODataDataSourceID="RadODataDataSource1" DataModelID="Category"
	DataTextField="CategoryName" DataValueField="CategoryID"
	ShowMoreResultsBox="true" ItemsPerRequest="4">
</telerik:RadComboBox>

<telerik:RadODataDataSource runat="server" ID="RadODataDataSource1">
	<Transport>
		<Read Url="http://services.odata.org/Northwind/Northwind.svc/" DataType="JSONP"/>
	</Transport>
	<Schema>
		<telerik:DataModel ModelID="Category" Set="Categories">
			<telerik:DataModelField FieldName="CategoryID" />
			<telerik:DataModelField FieldName="CategoryName" />
		</telerik:DataModel>
	</Schema>
</telerik:RadODataDataSource>

For more information about OData, please refer to OData Documentation.