treeview with multiple nodetemplates and accessing controls after postbacks

[Felipe]

Hello,

I seem to be having a problem with a radtreeview scenario and it is kind of putting my project to a halt right now.

I have a radtreeview with AppendDataBoundItems="true".  in the markup I include one node by default - with a node template.

i also bind the treeview with several more nodes (which are appended) and have a DIFFERENT NodeTemplate.

I need to access the controls in the first node from code-behind, so in my page_load event I find the control and assign it to a protected page variable.

This loads and works fine on page load.  Unfortanately, when I try to update the control via ajax - during the page_load it seems to have assigned the wrong template to the first node (it assigns the data-bound template instead).

as a result, the control that I need does not exist, and there is an error, and the ajax request never completes.

how can I get this to work across multiple updates?


the markup for the treeview:

<telerik:RadTreeView ID="RadTreeView1" runat="server"
            DataFieldID="ID" DataFieldParentID="ParentID"
            MultipleSelect="true"
            EnableDragAndDrop="true" OnClientDoubleClick="onNodeDoubleClick" OnClientNodeClicked="onNodeClick"
            EnableDragAndDropBetweenNodes="true" ShowLineImages="true"
            OnClientContextMenuItemClicking="onClientContextMenuItemClicking" OnClientNodeExpanded="onNodeExpanded"
            OnClientContextMenuShowing="onClientContextMenuShowing" Skin="dsSkin" EnableEmbeddedSkins="False" AppendDataBoundItems="true">
    <Nodes>
        <telerik:RadTreeNode Text="Document Date" Value="dateslider" >
            <NodeTemplate>Document Date</NodeTemplate>
            <Nodes>
                <telerik:RadTreeNode Value="datesliderchild" >
                    <NodeTemplate>
                        <%-- Node Template with control which I need to access AFTER ajax requests --%>
                        <telerik:RadSlider runat="server" ID="radSliderDates" IsSelectionRangeEnabled="true" Width="250"
                                                AutoPostBack="true" ShowDecreaseHandle="false" ShowIncreaseHandle="false"
                                                OnClientValueChanging="onClientValueChanging"
                                                OnClientSlideStart="onClientSlideStart"
                                                OnClientSlideEnd="onClientSlideEnd"
                                                OnClientSlide="onClientSlide" />
                    </NodeTemplate>
                </telerik:RadTreeNode>
            </Nodes>
        </telerik:RadTreeNode>
    </Nodes>
    <NodeTemplate>
        <%-- Global Node Template which I apply to data-bound items --%>
    </NodeTemplate>
</telerik:RadTreeView>

protected void Page_Load(object sender, EventArgs e)
{
    #region Load Event Handlers

    //Find node I am looking for - then assign controls to protected page variables.
    //On postbacks/ajax requests, the node is found, but the FindControl method does not find anything because the node has the wrong template
    RadTreeNode node = RadTreeView1.FindNodeByValue("datesliderchild");
    radSliderDates = (RadSlider)node.FindControl("radSliderDates");
    lblSliderEndDate = (Label)node.FindControl("lblSliderEndDate");
    lblSliderStartDate = (Label)node.FindControl("lblSliderStartDate");

    radSliderDates.ValueChanged += new EventHandler(radSliderDates_ValueChanged);

    #endregion

    if (!IsPostBack)
    {

    }
}

ANY help on this is much appreciated!

[Felipe]

UPDATE:

OK, I found out a little bit more about the source of the problem....

so part of the requirements that I have is that I am rebinding the treeview on certain postbacks/requests.

when I rebind it, I am more or less adding the same nodes (with updated data) that were data-bound before....

as a result, I am deleting the databound nodes from before (except for the first node, which is the special one), and then rebinding.

you can see this here:

private void BindTreeView()
{

    while ((RadTreeView1.Nodes.Count > 1))
        RadTreeView1.Nodes.Remove(RadTreeView1.Nodes[1]);

    RadTreeView1.DataTextField = "DisplayText";
    RadTreeView1.DataSource = Results.Tables[2];

    RadTreeView1.DataBind();

}

If i remove the lines where I remove the nodes - everything works fine (minus the fact that I am now duplicating nodes in the treeview)

[Felipe]

I believe I was able to work around the issue by putting the first node into an entirely separate radtreeview and styling them to look like they were part of the same control - not ideal for me but works well enough.