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RadTreeView1.SelectedNode Prob

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TreeView

This is a migrated thread and some comments may be shown as answers.

Nitin Nitin asked on 09 Apr 2010, 02:39 PM

Hello,
I'm trying to add nodes to the tree view as given in the example below on a button click.
http://demos.telerik.com/aspnet-ajax/treeview/examples/programming/addremovedisable/defaultvb.aspx

But I am not able to get the value of RadTreeView1.SelectedNode.
It always returns me NULL

My .aspx page is as below
[code]

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register TagPrefix="qsf" Namespace="Telerik.QuickStart" %>
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <telerik:RadScriptManager ID="RadScriptManager1" runat="server">
        </telerik:RadScriptManager>
     <telerik:RadAjaxManager runat="server" ID="RadAjaxManager1">
            <AjaxSettings>
                <telerik:AjaxSetting AjaxControlID="AddButton">
                    <UpdatedControls>
                        <telerik:AjaxUpdatedControl ControlID="RadTreeView1" LoadingPanelID="RadAjaxLoadingPanel1" />
                    </UpdatedControls>
                </telerik:AjaxSetting>
            </AjaxSettings>
        </telerik:RadAjaxManager>
        <telerik:RadAjaxLoadingPanel runat="server" ID="RadAjaxLoadingPanel1" />
   <qsf:ConfiguratorPanel runat="server" ID="ConfigurationPanel1" Title="Available actions" Orientation="Vertical" Expanded="true">
            <ul >
                <li>
                    <asp:Button ID="AddButton" runat="server" OnClick="AddButton_Click"></asp:Button>
                </li>
            </ul>
        </qsf:ConfiguratorPanel>

        <telerik:RadTreeView ID="RadTreeView1" runat="server" Height="280px" Width="300px" />

    </form>
</body>
</html>

and my .cs code
**************************

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using Telerik.Web.UI;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        RadTreeView1.LoadContentFile("~/XMLTreeViewStructure/SuiteTemplate.xml");
    }
    protected void AddButton_Click(object sender, EventArgs e)
    {
        IRadTreeNodeContainer target = RadTreeView1;
        if (RadTreeView1.SelectedNode != null)                    // Problem :- condition is not getting satisfied even when I select a tree node
        {
            RadTreeView1.SelectedNode.Expanded = true;
            target = RadTreeView1.SelectedNode;
        }
        RadTreeNode addedNode = new RadTreeNode("Course");
        addedNode.Selected = true;
        target.Nodes.Add(addedNode)
}

}

[/code]

Please advise me !

Thanks !
Nitin

2 Answers, 1 is accepted

answered on 12 Apr 2010, 08:56 AM

radtreeviewselectednode.zip

Hello Nitin Nitin,

I guess the problem is that in the demo in the tree.xml file we've set the property Selected = "true" to the Fiction node:

<Node Text="Fiction" Selected="True" />

That way you'll have a selected node in advance and the newly added node "Course" will be a child of it. So you'll need to select an node in your .xml file to be able to satisfy the "if (RadTreeView1.SelectedNode != null)" condition.

You may see the full code in the attached .zip file.

Hope this helps.

Veronica Milcheva
the Telerik team

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