C＃.NET Treeview节点已检查 [英] C# .NET Treeview Node Checked
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问题描述
我有一个带有多个节点和子节点的树视图控件（带复选框）。
当我点击父节点时，我需要选择其下的所有子节点。
SelectedNodeChanged& TreeNodeCheckChanged事件没有被解雇。
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.
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;
}
}
}
}
对此有任何帮助都非常感谢。
Any helps on this are highly appreciated.
推荐答案
而不是使用SelectedNodeChanged&TreeNodeCheckChanged事件，尝试TreeView.AfterCheck事件：更多信息。我在我的一个项目中使用了那个事件来完成同样的事情并且它对我有用...
[更新]
好的，TreeView.AfterCheckEvent事件位于Treeview的Events列表中。 行为部分下的第一个事件。
Hi,
Instead of making use of theSelectedNodeChanged&TreeNodeCheckChangedevents, try theTreeView.AfterCheckEvent: 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, theTreeView.AfterCheckEventevent is located within the Events list of the Treeview. The first event under the 'Behaviour' section.
<br />
<pre><br />
// event handler ...<br />
this.treeView1.AfterCheck += new System.Windows.Forms.TreeViewEventHandler(this.treeView1_AfterCheck);<br />
<br />
// <summary><br />
// Handles the AfterCheck event of the treeLocation control.<br />
// </summary><br />
private void treeView1_AfterChecktreeLocation_AfterCheck(object sender, TreeViewEventArgs e)<br />
{<br />
....<br />
}<br />
</pre><br />
- 或者 -
-- OR --
<br />
<pre><br />
// Updates all child tree nodes recursively.<br />
private void CheckAllChildNodes(TreeNode treeNode, bool nodeChecked)<br />
{<br />
foreach(TreeNode node in treeNode.Nodes)<br />
{<br />
node.Checked = nodeChecked;<br />
if(node.Nodes.Count > 0)<br />
{<br />
// If the current node has child nodes, call the CheckAllChildsNodes method recursively.<br />
this.CheckAllChildNodes(node, nodeChecked);<br />
}<br />
}<br />
}<br />
// NOTE This code can be added to the BeforeCheck event handler instead of the AfterCheck event.<br />
// After a tree node's Checked property is changed, all its child nodes are updated to the same value.<br />
private void node_AfterCheck(object sender, TreeViewEventArgs e)<br />
{<br />
// The code only executes if the user caused the checked state to change.<br />
if(e.Action != TreeViewAction.Unknown)<br />
{<br />
if(e.Node.Nodes.Count > 0)<br />
{<br />
/* Calls the CheckAllChildNodes method, passing in the current <br />
Checked value of the TreeNode whose checked state changed. */<br />
this.CheckAllChildNodes(e.Node, e.Node.Checked);<br />
}<br />
}<br />
}<br />
</pre><br />
- 或者 -
如果您正在使用ASP.NET，请查看以下帖子：查看所有相关的子节点
[更新]
亲切问候，
-- OR --
If your'e making use of ASP.NET, then have a look at the following post: Check all related childNodes
[UPDATE]
Kind regards,
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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);
}
}
}
}
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