Web Service Binding
Web Service Binding
Since Q2 2013 the RadDropDownTree control supports web service binding (WCF and ASMX). By using the Databindings settings of the RadDropDownTree control you can set the ExpandMode property to WebService. You will also need to set the path to the Web service and the name of the service method as specified in the WebServiceSettings' Path and Method properties below:
<telerik:RadDropDownTree RenderMode="Lightweight" ID="RadDropDownTree1" runat="server" DataSourceID="LinqDataSource1"
DataTextField="Text" DataValueField="id" Width="280px">
<databindings>
<telerik:DropDownNodeBinding Depth="0" ExpandMode="WebService" />
</databindings>
<webservicesettings path="DropDownTreeWebService.svc" method="LoadData"></webservicesettings>
</telerik:RadDropDownTree>
[ServiceContract(Namespace = "")]
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class DropDownTreeWebService
{
[OperationContract]
public DropDownNodeData[] LoadData(DropDownNodeData node)
{
TelerikSamplesDataContext context = new TelerikSamplesDataContext();
var result = from link in context.Links
where link.parentId == Convert.ToInt32(node.Value)
let children = from child in context.Links
where child.parentId == link.id
select child
select new DropDownNodeData
{
Text = link.Text,
ExpandMode = children.Count() > 0 ? DropDownTreeNodeExpandMode.WebService : DropDownTreeNodeExpandMode.ClientSide,
Value = link.id.ToString()
};
return result.ToArray();
}
}