unexpected behaviour w/ RadTreeView and Node Templates

[John Crumpton]

I have to do everything at runtime; tree nodes vary by user. I used example code to apply node templates... works as expected.
When I select a node (and get the postback) the templates are not applied. Then I select a node again (and get the postback), the template is applied... it just toggles back and forth. Code is below....
 

  Private Sub GetAccountProducts(ByVal AccountID As String, ByVal Category As String, ByRef node As Telerik.Web.UI.RadTreeNode)
        Try

            Dim objCom As New SqlClient.SqlCommand
            Dim objDA As New SqlClient.SqlDataAdapter
            Dim objDT As New DataTable

            objCom.Connection = objSLXCon
            objCom.CommandText = "select ap.ACCOUNTPRODUCTID, ap.SERIALNUMBER, ap.PRODUCTNAME " & _
                "from accountproduct ap inner join product p on ap.productid = p.productid " & _
                "where ap.accountid = '" & AccountID & "' and p.family = '" & Category & "' " & _
                "and ap.accountproductid in (select accountproductid from ADVANTAGEVISIONACCESS where contactid = '" & Request.Cookies("UserID").Value & "')"
            objDA.SelectCommand = objCom
            objDA.Fill(objDT)

            For Each dr As DataRow In objDT.Rows
                Dim AssetNode As New Telerik.Web.UI.RadTreeNode()
                AssetNode.Text = dr.Item("SERIALNUMBER").ToString
                AssetNode.Value = dr.Item("ACCOUNTPRODUCTID").ToString
                AssetNode.Attributes.Add("Level", "Asset")
                AssetNode.Attributes.Add("Model", dr.Item("PRODUCTNAME"))
                AssetNode.NavigateUrl = "Assets.aspx?Level=Asset&AssetID=" & dr.Item("ACCOUNTPRODUCTID").ToString
                Dim template As New AssetTemplate()
                template.InstantiateIn(AssetNode)
                node.Nodes.Add(AssetNode)
            Next

        Catch ex As Exception

        End Try
    End Sub

Class AccountTemplate
    Implements ITemplate

    Public Sub InstantiateIn(ByVal container As Control) Implements System.Web.UI.ITemplate.InstantiateIn
        Dim label1 As New Label()
        Dim node As RadTreeNode = DirectCast(container, RadTreeNode)
        label1.ID = "accountnamelabel"
        label1.Text = node.Text
        label1.ForeColor = Drawing.Color.Black
        container.Controls.Add(label1)
    End Sub

End Class

Class ContactTemplate
    Implements ITemplate

    Public Sub InstantiateIn(ByVal container As Control) Implements System.Web.UI.ITemplate.InstantiateIn
        Dim label1 As New Label()
        Dim node As RadTreeNode = DirectCast(container, RadTreeNode)
        label1.ID = "alllocationslabel"
        label1.Text = node.Text
        label1.ForeColor = Drawing.Color.Black
        container.Controls.Add(label1)
    End Sub

End Class

Class FamilyTemplate
    Implements ITemplate

    Public Sub InstantiateIn(ByVal container As Control) Implements System.Web.UI.ITemplate.InstantiateIn
        Dim label1 As New Label()
        Dim node As RadTreeNode = DirectCast(container, RadTreeNode)
        label1.ID = "familynamelabel"
        label1.Text = node.Text
        label1.ForeColor = Drawing.Color.Black
        container.Controls.Add(label1)
    End Sub

End Class

Class AssetTemplate
    Implements ITemplate

    Public Sub InstantiateIn(ByVal container As Control) Implements System.Web.UI.ITemplate.InstantiateIn
        Dim label1 As New Label()
        Dim label2 As New Label()


        Dim node As RadTreeNode = DirectCast(container, RadTreeNode)
        label1.ID = "assetnamelabel"
        label1.Text = node.Attributes("Model")
        label1.ForeColor = Drawing.Color.Black
        container.Controls.Add(label1)
        label2.ID = "assetseriallabel"
        label2.Text = " - SN: " & node.Text
        label2.ForeColor = Drawing.Color.Black
        container.Controls.Add(label2)
    End Sub

End Class

[Nikolay Tsenkov]

Hi John Crumpton,

When do you apply the templates? Usually they should be applied on "Page_Init"-time.

Could you please send me an example project reproducing the issue. To do that you have to open a support ticket and attach the archive with the project there.

Your code seems to be perfectly fine, that is why I need more than just a part from the code-behind.
My advice for you is - prepare a project as simple as possible and still reproducing the problem.

Thanks.


Regards,
Nikolay Tsenkov
the Telerik team

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[John Crumpton]

Thanks Nikolay,
I opened a ticket w/ a sample solution that does reproduce the problem... in the process of removing the unnecesary bits (data binding, etc) from my working project, I found that the problem only occurs when I update other controls in the tree's nodeclick event. The nodeclick event does force a postback... but I'm checking for that in the init event, so the nodes/templates are not recreated. If i remove the postback check and remove/recreate the nodes, it still loses the template formatting.