C# .NET Treeview Node Checked

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I have a treeview control(with checkboxes) with several nodes and child nodes.
When I click on a parent node, I need all the child nodes under that to be selected.
SelectedNodeChanged & TreeNodeCheckChanged events are not getting fired.

C#

protected void tvwPhases_SelectedNodeChanged(object sender, EventArgs e)
{
    for (int iCnt = 0; iCnt < tvwPhases.Nodes.Count; iCnt++)
    {
        if ((tvwPhases.Nodes[iCnt].ChildNodes.Count > 0) && (tvwPhases.Nodes[iCnt].Checked == true))
        {
            for (int jCnt = 0; jCnt < tvwPhases.Nodes[iCnt].ChildNodes.Count; jCnt++)
            {
                tvwPhases.Nodes[iCnt].ChildNodes[jCnt].Checked = true;
            }
        }
    }
}

Any helps on this are highly appreciated.

Posted 15-May-11 23:35pm

Prabhu_Sundaram

Updated 15-May-11 23:48pm

v2

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Hemant__Sharma 16-May-11 5:40am

Add some code here.

2 solutions

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Programm3r · Answer 1 · 2011-05-16T02:00:00

Hi,

Instead of making use of the SelectedNodeChanged & TreeNodeCheckChanged events, try the TreeView.AfterCheck Event: More Information. I made use of that event in one of my projects to accomplish the exact same thing and it worked for me...

[UPDATE]

Okay, the TreeView.AfterCheckEvent event is located within the Events list of the Treeview. The first event under the 'Behaviour' section.

// event handler ...
this.treeView1.AfterCheck += new System.Windows.Forms.TreeViewEventHandler(this.treeView1_AfterCheck);

// <summary>
// Handles the AfterCheck event of the treeLocation control.
// </summary>
private void treeView1_AfterChecktreeLocation_AfterCheck(object sender, TreeViewEventArgs e)
{
....
}

-- OR --

// Updates all child tree nodes recursively.
private void CheckAllChildNodes(TreeNode treeNode, bool nodeChecked)
{
   foreach(TreeNode node in treeNode.Nodes)
   {
      node.Checked = nodeChecked;
      if(node.Nodes.Count > 0)
      {
         // If the current node has child nodes, call the CheckAllChildsNodes method recursively.
         this.CheckAllChildNodes(node, nodeChecked);
      }
   }
}
// NOTE   This code can be added to the BeforeCheck event handler instead of the AfterCheck event.
// After a tree node's Checked property is changed, all its child nodes are updated to the same value.
private void node_AfterCheck(object sender, TreeViewEventArgs e)
{
   // The code only executes if the user caused the checked state to change.
   if(e.Action != TreeViewAction.Unknown)
   {
      if(e.Node.Nodes.Count > 0)
      {
         /* Calls the CheckAllChildNodes method, passing in the current 
         Checked value of the TreeNode whose checked state changed. */
         this.CheckAllChildNodes(e.Node, e.Node.Checked);
      }
   }
}

-- OR --

If your'e making use of ASP.NET, then have a look at the following post: Check all related childNodes

[UPDATE]

Kind regards,

Er Atul Sharma · Answer 2 · 2015-01-21T00:52:00

XML

Hey, it works on me, please try this:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="TestWebDemo.WebForm1" %>

<!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>Table Demo</title>
    <script type="text/javascript">

     function postBackByObject()
     {
         var o = window.event.srcElement;
         if (o.tagName == "INPUT" && o.type == "checkbox")
        {
           __doPostBack("","");
        }
    }
   </script>

</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TreeView ID="TreeView1" runat="server"
            ontreenodecheckchanged="TreeView1_TreeNodeCheckChanged">
            <Nodes>
                <asp:TreeNode ShowCheckBox="True" Text="New Node 1" Value="New Node">
                </asp:TreeNode>
                <asp:TreeNode ShowCheckBox="True" Text="New Node" Value="New Node">
                </asp:TreeNode>
                <asp:TreeNode ShowCheckBox="True" Text="New Node" Value="New Node">
                </asp:TreeNode>
                <asp:TreeNode ShowCheckBox="True" Text="New Node" Value="New Node">
                </asp:TreeNode>
                <asp:TreeNode ShowCheckBox="True" Text="New Node" Value="New Node">
                </asp:TreeNode>
                <asp:TreeNode ShowCheckBox="True" Text="New Node" Value="New Node">
                </asp:TreeNode>
            </Nodes>
        </asp:TreeView>
    </div>
    </form>
</body>
</html>

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

namespace TestWebDemo
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            TreeView1.Attributes.Add("onclick", "postBackByObject()");
        }

        protected void TreeView1_TreeNodeCheckChanged(object sender, TreeNodeEventArgs e)
        {
            if (e.Node.Text == "New Node 1")
            {
                ClientScript.RegisterStartupScript(GetType(), "alertme", "alert('The first node is selected...');", true);
            }
        }
    }
}

C# .NET Treeview Node Checked

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