TreeView 一些总结

1、收缩其他已点过的节点

View Code

       /// <summary>
       /// 收缩其他已点过的节点
       /// </summary>
       protected void TreeView1_TreeNodeExpanded(object sender, TreeNodeEventArgs e)
        {
            TreeNodeCollection ts = null;
            if (e.Node.Parent == null)
            {
                ts = ((TreeView)sender).Nodes;
            }
            else
                ts = e.Node.Parent.ChildNodes;
            foreach (TreeNode node in ts)
            {
                if (node != e.Node)
                {
                    node.Collapse();
                }
            }      
        }

2、设置节点收缩展开时的图片文件

View Code

       /// <summary>
       /// 设置节点收缩展开时的图片文件
       /// </summary>
       protected void TreeView1_TreeNodeExpanded(object sender, TreeNodeEventArgs e)
        {
            e.Node.ImageUrl = "/images/folder_Open.gif";
        }
        protected void TreeView1_TreeNodeCollapsed(object sender, TreeNodeEventArgs e)
        {
            e.Node.ImageUrl = "/images/folder_Close.gif";
        }

3、查找指定节点以及它的所有子节点

View Code

       /// <summary>
        /// 查找指定节点以及它的所有子节点
        /// </summary>
        /// <param name="tnParent"></param>
        /// <param name="tnList"></param>
        private void FindNode(TreeNode tnParent, ref  List<TreeNode> tnList)
        {
            tnList.Add(tnParent);
            foreach (TreeNode tn in tnParent.ChildNodes)
            {
                FindNode(tn, ref tnList);
            }
        }

4、删除选择的节点以及它的所有子节点

View Code

        /// <summary>
        /// 删除选择的节点以及它的所有子节点
        /// </summary>
        protected void btnDelNode_Click(object sender, EventArgs e)
        {
            if (this.TreeView1.SelectedNode != null)
            {
                List<TreeNode> tnList = new List<TreeNode>();
                FindNode(this.TreeView1.SelectedNode, ref tnList);
                List<int> idList = new List<int>();
                tnList.ForEach(t => idList.Add(Convert.ToInt32(t.Value)));
                //删除所有节点，如果只删除选择节点用this.TreeView1.SelectedNode.Parent.ChildNodes.Remove(this.TreeView1.SelectedNode);   
                tnList.ForEach(t => t.Parent.ChildNodes.Remove(t));
                
                //删除数据库中相应数据
                //....              
            }
        }

5、在选择的节点下面添加子节点

View Code

         ///在选择的节点下面添加子节点
      TreeNode tn = new TreeNode("节点名称", "保存到数据库后的节点ID");
         tn.ImageUrl = "/images/page.gif";
         this.TreeView1.SelectedNode.ImageUrl = "/images/folder_Open.gif";
         this.TreeView1.SelectedNode.ChildNodes.Add(tn);
         this.TreeView1.SelectedNode.Expand();

6、JS获取所有选中节点的值 （把节点的值保存在ToolTip，点击节点时获取这个值）

.aspx

View Code

<!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>
    <mce:script language="javascript" type="text/javascript"><!--
        function init1() {
            var getAllNodes = "";
            var tree = document.getElementById("treeView1").getElementsByTagName("Input");
            for (var i = 0; i < tree.length; i++) {
                if (tree[i].type == "checkbox" && tree[i].checked) {
            if (tree[i].getAttribute("title", 2) != ""){                   
                       getAllNodes = getAllNodes + tree[i].nextSibling.innerHTML + ";";
                    }
                }
            }
            alert(getAllNodes);//所有选中节点的值
        }
    
// --></mce:script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TreeView ID="treeView1" runat="server" EnableClientScript="False" ShowExpandCollapse="False"
            OnClick="init1(this)">
        </asp:TreeView>
    </div>
    </form>
</body>
</html>

.aspx.cs

View Code

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DataTable dt = GetDataTable();
            DataRow[] rows = dt.Select();
            foreach (DataRow row in rows)
            {
                TreeNode nd = new TreeNode();
                nd.Text = row["name"].ToString();
                nd.Value = row["id"].ToString();
                nd.ToolTip = row["id"].ToString();
                nd.ShowCheckBox = true;                
                treeView1.Nodes.Add(nd);
            }
        }
    }
    DataTable GetDataTable()
    {
        System.Data.DataTable dt = new System.Data.DataTable();
        System.Data.DataRow dr;
        dt.Columns.Add(new System.Data.DataColumn("id", typeof(System.Int32)));
        dt.Columns.Add(new System.Data.DataColumn("name", typeof(System.String)));
        dr = dt.NewRow();
        dr[0] = 1;
        dr[1] = "广东";
        dt.Rows.Add(dr);
        dr = dt.NewRow();
        dr[0] = 2;
        dr[1] = "广西";
        dt.Rows.Add(dr);   
        return dt;
    }