NodeTemplate on postback

[Alexey]

Hello,

I have a RadTreeView and button on the page, RadTreeView is filled programmatically when click on the button. I use NodeTemplate for nodes but after postback template is not used. Could anybody help me?

ASPX

<telerik:RadScriptManager ID="ScriptManager" runat="server" EnableViewState="false"></telerik:RadScriptManager>
        <telerik:RadAjaxManager ID="AjaxManager" runat="server" DefaultLoadingPanelID="RadAjaxLoadingPanel1">
            <AjaxSettings>
                <telerik:AjaxSetting AjaxControlID="rtvSearchResult" EventName="OnNodeClick">
                    <UpdatedControls>
                        <telerik:AjaxUpdatedControl ControlID="rtsObjInfo"></telerik:AjaxUpdatedControl>
                    </UpdatedControls>
                </telerik:AjaxSetting>
                <telerik:AjaxSetting AjaxControlID="btnSearch">
                    <UpdatedControls>
                        <telerik:AjaxUpdatedControl ControlID="rtvSearchResult"></telerik:AjaxUpdatedControl>
                    </UpdatedControls>
                </telerik:AjaxSetting>
            </AjaxSettings>
            <ClientEvents OnResponseEnd="OnResponseEnd" />
        </telerik:RadAjaxManager>
<telerik:RadTreeView ID="rtvSearchResult" OnNodeClick="rtvSearchResult_NodeClick"
                                                    OnClientMouseOver="onNodeOver" OnClientMouseOut="onNodeOut" runat="server" Height="100%">
<asp:Button ID="btnSearch" OnClick="btnSearchClick" runat="server" />
<telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server"></telerik:RadAjaxLoadingPanel>

CodeBehind

public List<common.DOCUMENT_OBJECT_MAP> list;

        protected void Page_Load(object sender, EventArgs e)
        {
            list = new List<common.DOCUMENT_OBJECT_MAP>();
            list.Add(new common.DOCUMENT_OBJECT_MAP() { ID = 1, NAME = "Obj1" });
            list.Add(new common.DOCUMENT_OBJECT_MAP() { ID = 2, NAME = "Obj2" });
            list.Add(new common.DOCUMENT_OBJECT_MAP() { ID = 3, NAME = "Obj3" });
        }
protected void btnSearchClick(object sender, EventArgs e)
        {
            rtvSearchResult.Nodes.Clear();

            foreach (common.DOCUMENT_OBJECT_MAP obj in list)
            {
                RadTreeNode newNode = new RadTreeNode();
                newNode.Text = obj.NAME;
                newNode.ToolTip = obj.NAME;
                newNode.Value = obj.ID.ToString();
                newNode.DataItem = obj.ID_LAYER;
                newNode.NodeTemplate = new TreeNodeTemplate(obj);

                RadTreeNode parentNode = rtvSearchResult.FindNodeByValue(obj.ID_FOLDER.ToString());
                if (parentNode != null)
                {
                    parentNode.Nodes.Add(newNode);
                }
                else
                {
                    rtvSearchResult.Nodes.Add(newNode);
                }
            }
            rtvSearchResult.Visible = true;
        }
public class TreeNodeTemplate : ITemplate
    {
        private common.DOCUMENT_OBJECT_MAP _obj;

        public TreeNodeTemplate(common.DOCUMENT_OBJECT_MAP obj)
        {
            _obj = obj;
        }
        public void InstantiateIn(Control container)
        {
            Label control = new Label();
            control.ID = "lbn_" + _obj._ID;
            control.ClientIDMode = ClientIDMode.Static;
            control.Text = _obj._NAME;
            container.Controls.Add(control);

            Label lbButtons = new Label();
            lbButtons.Text = "<input type='button' value='1'/>";
            lbButtons.ID = "node_" + _obj.ID + "_cmd";
            lbButtons.ClientIDMode = ClientIDMode.Static;
            container.Controls.Add(lbButtons);
        }
    }

Thanks!

[Plamen]

Hi Alexey,

Dynamically added templates are not persistent and should be added on every postback. Please check this help article which demonstrates this approach. 

You can also refer to this forum thread where a similar issue is discussed.

Greetings,
Plamen Zdravkov
the Telerik team

[nfigueroa]

Oopps!  Wrong  thread!