Binding to RadClientDataSource

This article demonstrates how to bind RadTreeView to RadClientDataSource.

Since Q2 2014 RadTreeView can be bound to a RadClientDataSource control. An important aspect of binding to the RadClientDataSource is that the RadTreeView DataText and DataValue, DataFieldID, DataFieldParentID and DataNavigateUrlField fields should be associated with the custom object properties. Thus you can choose which property value to be shown as RadTreeView item text and value. For reference at the bottom of the web service implementation below you will find the custom class and its properties declaration.

The code snippet below shows sample configuration of RadTreeView bound to RadClientDataSource. The peculiarity of such scenario comes from the fact that the RadTreeView represents hierarchical data. Considering that fact we expect such type of data to be returned by the service to the RadClientDataSource.

Initially the RadTreeView control requests only the root items data from the RadClientDataSource. In the example below it will check for all items data that have ParentID property value to null.

<telerik:RadClientDataSource runat="server" ID="CD1">
    <clientevents />
    <datasource>
            <WebServiceDataSourceSettings BaseUrl="url/Service.svc/">
                <Select Url="LoadCustomSelfReferencingData" DataType="JSON" RequestType="Post" ContentType="application/json; charset=utf-8" />
            </WebServiceDataSourceSettings>
        </datasource>

    <schema dataname="d">
        </schema>
    <clientevents />
</telerik:RadClientDataSource>

<telerik:RadTreeView RenderMode="Lightweight" ID="RadTreeView1" runat="server" Height="300px" Width="100%" PersistLoadOnDemandNodes="false" ClientDataSourceID="CD1"
    DataFieldParentID="ParentID" DataFieldID="ID" DataTextField="Name" DataValueField="Value">
</telerik:RadTreeView>

[OperationContract]
public SelfReferencingData[] LoadCustomSelfReferencingData()
{
    var list = new List<SelfReferencingData>();

    list.Add(new SelfReferencingData() { Name = "Cars", Value = "11", ParentID = null, ID = "1" });
    list.Add(new SelfReferencingData() { Name = "Ford", Value = "22", ParentID = "1", ID = "2" });
    list.Add(new SelfReferencingData() { Name = "Mustang 1", Value = "33", ParentID = "2", ID = "3" });
    list.Add(new SelfReferencingData() { Name = "Mustang 2", Value = "44", ParentID = "2", ID = "4" });

    list.Add(new SelfReferencingData() { Name = "Bikes", Value = "55", ParentID = null, ID = "5" });
    list.Add(new SelfReferencingData() { Name = "Cross", Value = "66", ParentID = "5", ID = "6" });
    list.Add(new SelfReferencingData() { Name = "Mon 1", Value = "77", ParentID = "6", ID = "7" });
    list.Add(new SelfReferencingData() { Name = "Mon 2", Value = "88", ParentID = "6", ID = "8" });

    return list.ToArray();
}

public class SelfReferencingData
{
    public string Name { get; set; }
    public string Value { get; set; }
    public string ID { get; set; }
    public string ParentID { get; set; }
    //public string NavigateURL { get; set; }
}

    Inherits System.Web.UI.Page
    <OperationContract> _
    Public Function LoadCustomSelfReferencingData() As SelfReferencingData()
        Dim list = New List(Of SelfReferencingData)()

    list.Add(New SelfReferencingData() With { _
        Key .Name = "Cars", _
        Key .Value = "11", _
        Key .ParentID = Nothing, _
        Key .ID = "1" _
    })
    list.Add(New SelfReferencingData() With { _
        Key .Name = "Ford", _
        Key .Value = "22", _
        Key .ParentID = "1", _
        Key .ID = "2" _
    })
    list.Add(New SelfReferencingData() With { _
        Key .Name = "Mustang 1", _
        Key .Value = "33", _
        Key .ParentID = "2", _
        Key .ID = "3" _
    })
    list.Add(New SelfReferencingData() With { _
        Key .Name = "Mustang 2", _
        Key .Value = "44", _
        Key .ParentID = "2", _
        Key .ID = "4" _
    })

    list.Add(New SelfReferencingData() With { _
        Key .Name = "Bikes", _
        Key .Value = "55", _
        Key .ParentID = Nothing, _
        Key .ID = "5" _
    })
    list.Add(New SelfReferencingData() With { _
        Key .Name = "Cross", _
        Key .Value = "66", _
        Key .ParentID = "5", _
        Key .ID = "6" _
    })
    list.Add(New SelfReferencingData() With { _
        Key .Name = "Mon 1", _
        Key .Value = "77", _
        Key .ParentID = "6", _
        Key .ID = "7" _
    })
    list.Add(New SelfReferencingData() With { _
        Key .Name = "Mon 2", _
        Key .Value = "88", _
        Key .ParentID = "6", _
        Key .ID = "8" _
    })

        Return list.ToArray()
    End Function

    Public Class SelfReferencingData
        Public Property Name() As String
            Get
                Return m_Name
            End Get
            Set(value As String)
                m_Name = Value
            End Set
        End Property
        Private m_Name As String
        Public Property Value() As String
            Get
                Return m_Value
            End Get
            Set(value As String)
                m_Value = Value
            End Set
        End Property
        Private m_Value As String
        Public Property ID() As String
            Get
                Return m_ID
            End Get
            Set(value As String)
                m_ID = Value
            End Set
        End Property
        Private m_ID As String
        Public Property ParentID() As String
            Get
                Return m_ParentID
            End Get
            Set(value As String)
                m_ParentID = Value
            End Set
        End Property
        Private m_ParentID As String
        'public string NavigateURL { get; set; }
    End Class
#End Region

End Class