Dynamic TreeView - assign server side events?

[richard]

Hello
I am creating a number of RadTreeView controls at run time:

RadTreeView MyTree = new RadTreeView();

I am struggling to see how to assign the OnNodeExpand event to a code behind event.
With a static declaration this was :

<telerik:RadTreeView  OnNodeExpand="RadPopulateNode">

But I can't see a property at runtime that matches OnNodeExpand.

Please could anyone help me with the answer.

Thankyou

[Princy]

Hello,

Try the following code.
C#:

protected void Page_Load(object sender, EventArgs e)
 {
    RadTreeView RadTreeView1 = new RadTreeView();
    RadTreeView1.NodeExpand += new RadTreeViewEventHandler(RadTreeView1_NodeExpand);
 }
void RadTreeView1_NodeExpand(object sender, RadTreeNodeEventArgs e)
  {
    //your code
  }

Thanks,
Princy.

[richard]

FAB
Thanks Princy

[richard]

Hi Princy
having trouble as the event won't fire:-
see thread :
http://www.telerik.com/community/forums/aspnet-ajax/splitter/reference-controls-from-javascript.aspx

Thought you might be able to see what could be wrong.

Thanks
Richard

[richard]

I tried moving the code to Page_PreRender from Page_Load but then receive this error when trying to expand the node:

"The target 'ctl03' for the callback could not be found or did not implement ICallbackEventHandler"

Code now reads:

// Dynamically create sliding panes and tree view in each pane

 foreach (XmlNode xn in xnList)

        {

            // Create a new Tab

            RadSlidingPane leftSlidingPane = new RadSlidingPane();

            leftSlidingPane.Title = xn["label"].InnerText;

            leftSlidingPane.Overlay = true;

            leftSlidingPane.MinWidth = 50;

            leftSlidingPane.Width = 300;



            // Add the sliding panel to the left sliding zone

            ExploreSlidingZone.Items.Add(leftSlidingPane);



            // Create tree view

            RadTreeView myTree = new RadTreeView();

            myTree .NodeExpand += new RadTreeViewEventHandler(RadPopulateNode);



            myTree .OnClientNodeClicking = "ClientNodeClicking";

            myTree .ShowLineImages = true;

            myTree .OnClientContextMenuShowing = "OnClientContextMenuShowing";





            // Create root node

            RadTreeNode ExploreRootNode = new RadTreeNode(" " + xn["label"].InnerText);



            // Set root node properties

            ExploreRootNode.ExpandMode = TreeNodeExpandMode.ServerSideCallBack;

            ExploreRootNode.PostBack = false;



            // add the root node to the sliding pane

            myTree .Nodes.Add(ExploreRootNode);



            // Bind context menu to treeview

            BindContextMenu(myTree );



            // Add treeview to sliding pane

            leftSlidingPane.Controls.Add(myTree );



                }



----------------------



 protected void RadPopulateNode(object sender, RadTreeNodeEventArgs e)

    {

        RadBindTreeToDirectory(e.Node);

    }

[Plamen]

Hi Richard,

 

Thank you for contacting Telerik support.

Here is a code that adds the tree dynamically:

Copy Code

protected void Page_Load(object sender, EventArgs e)
   {
       RadTreeView view = new RadTreeView();
       view.ID = "test";
       view.NodeExpand += new RadTreeViewEventHandler(view_NodeExpand);

       RadTreeNode node1 = new RadTreeNode("a");
       view.Nodes.Add(node1);
       node1.ExpandMode = TreeNodeExpandMode.ServerSideCallBack;

       this.form1.Controls.Add(view);
   }

   void view_NodeExpand(object sender, RadTreeNodeEventArgs e)
   {
       e.Node.Nodes.Add(new RadTreeNode(e.Node.Text + "1"));
       e.Node.Nodes.Add(new RadTreeNode(e.Node.Text + "2"));
       e.Node.Nodes.Add(new RadTreeNode(e.Node.Text + "3"));
   }

Hope this will be helpful. If you have further questions please don't hesitate to ask. 

All the best,
Plamen Zdravkov
the Telerik team