NODEEXPAND property Problem

[Xorv]

Hi Admin,

I want to fire RadTreeView to expand and load data, to nodes dynamically and automatically. When I use normal asp.net tree view and its property ''PopulateOnDemand" and set 'OnTreeNodePopulate' to fire a function, it does the pupose.

ASPX:-
<asp:TreeView Runat="Server" OnTreeNodePopulate="Node_Populate" ID="treeView1"  OnTreeNodeExpanded="Node_Expand">

 

<Nodes>

 

<asp:TreeNode Text="ALL"  PopulateOnDemand= "true" Value="0"  />

 

</Nodes>

 

</asp:TreeView>

CS file:-

public void Node_Populate(object sender, System.Web.UI.WebControls.TreeNodeEventArgs e)

    {

        if (e.Node.ChildNodes.Count == 0)

        {

            switch (e.Node.Depth)

            {

                case 0:

                    FillTerritories(e.Node);

                    break;

                case 1:

                    FillOrganizations(e.Node);

                    break;

                case 2:

                    FillOffices(e.Node);

                    break;

            }

        }

    }

So when the page loades,TreeView loades with a root node ("ALL") and hence forth, due to 'PopulateOnDemand' property its node gets fired(clicked), calling 'Node_Populate' function to handle the loading of nodes.


Now, THE QUESTION. Same thing I want in telerik. I already tried what documentation is available here and suggestion by experts here.
the is:- telerik property 'OnNodeExpand' fires only when a node is clicked by someone. I want to populate node automatically from root node itself. So please help what to do in this regard.

Here is what I have tried:-
ASPX File

<telerik:RadTreeView Runat="Server" ID="RadTreeView1" Skin="Vista" OnNodeExpand = "Rad_NodeExpand" >

</telerik:RadTreeView>

CS FILE

protected void Rad_NodeExpand(object sender, RadTreeNodeEventArgs e)
    {
        if (e.Node.Nodes.Count == 0)
        {
            switch (e.Node.Level)
            {
                case 0:
                    FillTerritories(e.Node);
                    break;
                case 1:
                    FillOrganizations(e.Node);
                    break;
                case 2:
                    FillOffices(e.Node);
                    break;
            }
        }
    }

     PLEASE DON'T REFER ME ANY DOCUMENT. SEE IF YOU CAN GET MY PROBLEM.

Thanks a lot

 

 

[Bozhidar]

Hi Sourav,

If I understand you correctly, you want to automatically trigger the load on demand from the root node when the tree is loaded. To accomplish that, you can use the set_expanded() client method of the node. Here's a small example:

<telerik:RadTreeView OnNodeExpand="RadTreeView1_NodeExpand" OnClientLoad="clientLoad" ID="RadTreeView1" runat="server">
    <Nodes>
        <telerik:RadTreeNode Text="root" ExpandMode="ServerSideCallBack" />
    </Nodes>
</telerik:RadTreeView>
<script type="text/javascript">

    function clientLoad(sender) {
        var tree = sender;
        var rootNode = sender.get_nodes().getNode(0);
        rootNode.set_expanded(true);
    }

</script>

Kind regards,
Bozhidar
the Telerik team