Node Populating issue with Webservice method after postback

[mohmedsadiq modan]

Hello,

I have created one page which have Treeview and other controls. Child node data populating using web-service method.

 <ajaxToolkit:ToolkitScriptManager runat="server" ID="RadScriptManager1" AsyncPostBackTimeout="18000">
</ajaxToolkit:ToolkitScriptManager>
<telerik:RadScriptBlock>
<script>
 var allowDragDrop = "<%= allowDragAndDrop%>";
            var SelectedType;
            function nodePopulating(sender, eventArgs) {
                var node = eventArgs.get_node();
                var context = eventArgs.get_context();
                SelectedType = document.getElementById('<%=hdnSelectedNodeType.ClientID %>').value;
                context["ParentID"] = node.get_value();
                context["AllowDragAndDrop"] = allowDragDrop;
                context["SelectedType"] = SelectedType;
            }
        </script>
</telerik:RadScriptBlock>

Treeview is located in one Update panel and Other controls are located in Second Update panel like below.
<div ID="Left">
  <asp:UpdatePanel ID="upLeft" runat="server" UpdateMode="Conditional">
       <ContentTemplate>
             <telerik:RadTreeView ID="tvNodes" runat="server" EnableDragAndDrop="false" ExpandAnimation-Type="OutExpo"
                                        ExpandAnimation-Duration="800" EnableDragAndDropBetweenNodes="false"
                                        CollapseAnimation-Type="OutElastic"
                                        CollapseAnimation-Duration="800" Skin="Windows7" OnNodeDrop="tvNodes_HandleDrop"
                                        OnNodeExpand="tvNodes_NodeExpand" OnNodeClick="tvNodes_Click"
                                        OnContextMenuItemClick="tvNodes_ContextMenuItemClick"
                                        OnClientContextMenuItemClicking="onClientContextMenuItemClicking"
                                        OnClientContextMenuShowing="onClientContextMenuShowing"
                                        OnClientNodeDropping="onNodeDropping"
                                        OnClientNodeDragging="OnClientNodeDragging"
                                        OnClientNodeClicked="OnClientNodeClicked"
                                        OnClientNodeClicking="OnClientNodeClicking"
                                        OnClientNodePopulating="nodePopulating">
                                        <ContextMenus>
                                            <telerik:RadTreeViewContextMenu ID="NodesTreeMenu" runat="server" CssClass="MenuGroup"
                                                Skin="Windows7">
                                                <CollapseAnimation Type="none" />
                                            </telerik:RadTreeViewContextMenu>
                                        </ContextMenus>
                                        <WebServiceSettings Path="../ManageNode.asmx" Method="GetNodes"></WebServiceSettings>
                                    </telerik:RadTreeView>
    </ContentTemplate>
   </asp:UpdatePanel>
</div>
<div id="right">
     <asp:UpdatePanel ID="upright" runat="server" UpdateMode="Conditional">
         <ContentTemplate>
           <asp:Button ID="btnSave" runat="server" OnClick="btnSave_Click" Text="Save" ValidationGroup="surveyValidate" />
            .......................... <!-- Other Controls -->
         </ContentTemplate>
       </asp:UpdatePanel>
</div>

When I clicked on node then I have loaded selected node-data into the right side controls which is in upRight update panel, when I perform click "btnSave" then we are updating node information and then call upleft.Update() to update treeview node,
after that If I want to populate child nodes for selected node then it will gives error like eventArgs.get_context() is null.

if upleft.Update()  is commented then perform above operation then the error is not occurred. But I have to update the Treeview information as well.

Please help me out why this error is occurred.

Thanks,
Mohmedsadiq Modan

[Helen]

Hi,

How exactly do you update nodes?
Could you please send us a sample which demonstrates the issue to examine it locally?

Kind regards,
Helen
the Telerik team