用js查找treeview的节点，并自动展开搜索到的节点

第一步，查找treeview的节点

  var key = $("#txtQuery").val();
                var searchElement = $("a:contains('" + key + "')");
                if (searchElement.length == 0) {
                    alert("未找到");
                    return;
                }

 第二步：展开节点

1、查找它所有的上级节点

2、如果节点没有展开，则模拟点击事件

<%@ Page Title="" Language="C#" MasterPageFile="~/Site1.Master" AutoEventWireup="true"
    CodeBehind="WebForm2.aspx.cs" Inherits="hyfw.WebForm2" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
    <script type="text/javascript" src="js/jquery-1.4.2.min.js"></script>
    <title></title>
    <script type="text/javascript">
        function checkIsExpand(id) {
            var reg = /treet(\d+)/;
            var result = reg.exec(id);
            var index = result[1];
            var expandState = ContentPlaceHolder1_tree_Data.expandState.value.charAt(index)
            if (expandState == "e")
                return true;
            else
                return false;
        }



        $(document).ready(function () {
            $("#btnSearch").click(function () {
                var key = $("#txtQuery").val();
                var searchElement = $("a:contains('" + key + "')");
                if (searchElement.length == 0) {
                    alert("未找到");
                    return;
                }
                var fid = searchElement[0].name;
                var parentArray = fid.split(",");
                for (var i = 0; i < parentArray.length; i++) {
                    var treeA = $("#" + parentArray[i]);
                    if (treeA.length > 0) {
                        var treets = treeA.siblings();
                        if (treets.length == 0) {
                            treets = treeA.parent();
                        }
                        var treet = treets[0];
                        var id = treet.id;
                        var isExpand = checkIsExpand(id);
                        if (!isExpand) {
                            id = id.replace("treet", "treen");
                            $("#" + id).get(0).click();
                        }
                    }
                }
            })
        })
    </script>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
    <input type="text" id="txtQuery" /><input type="button" id="btnSearch" value="查询" />
    <asp:TreeView ID="tree" runat="server">
    </asp:TreeView>
</asp:Content>

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

namespace hyfw
{
    public partial class WebForm2 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                List<MemberGroup> groups = GetMemberGroups();
                TreeNode rootNode = GetNode(10, "深圳市人民医院", "0,10");
                tree.Nodes.Add(rootNode);
                BuildTree(rootNode, groups, 10);
                tree.CollapseAll();
            }
        }

        void txtSearch_TextChanged(object sender, EventArgs e)
        {

        }

        protected void BuildTree(TreeNode node, List<MemberGroup> groups, int fId)
        {
            List<MemberGroup> childGroups = groups.Where(g => g.GroupFId == fId).ToList();
            if (childGroups.Count > 0)
            {
                foreach (MemberGroup group in childGroups)
                {
                    TreeNode childNode = GetNode(group.GroupId, group.GroupName, group.Path);
                    childNode.SelectAction = TreeNodeSelectAction.None;
                    node.ChildNodes.Add(childNode);
                    BuildTree(childNode, groups, group.GroupId);
                }
            }
        }

        private static TreeNode GetNode(int groupId, string groupName, string path)
        {
            TreeNode childNode = new TreeNode() { Value = groupId.ToString() };
            childNode.Text = "<a id='" + groupId.ToString() + "' name='" + path + "' href=\"#\" >" + groupName + "</a>";
            return childNode;
        }

        public List<MemberGroup> GetMemberGroups()
        {
            List<MemberGroup> memberGroups = new List<MemberGroup>();
            memberGroups.Add(new MemberGroup() { GroupFId = 0, GroupId = 10, GroupName = "深圳市人民医院", Path = "0" });
            memberGroups.Add(new MemberGroup() { GroupFId = 10, GroupId = 1010, GroupName = "体检病人", Path = "0,10" });
            memberGroups.Add(new MemberGroup() { GroupFId = 10, GroupId = 1011, GroupName = "住院病人", Path = "0,10" });
            memberGroups.Add(new MemberGroup() { GroupFId = 10, GroupId = 1012, GroupName = "门诊病人", Path = "0,10" });
            memberGroups.Add(new MemberGroup() { GroupFId = 1010, GroupId = 101010, GroupName = "集团用户", Path = "0,10,1010" });
            memberGroups.Add(new MemberGroup() { GroupFId = 1010, GroupId = 101011, GroupName = "个人用户", Path = "0,10,1010" });
            memberGroups.Add(new MemberGroup() { GroupFId = 101010, GroupId = 10101010, GroupName = "福田中学", Path = "0,10,1010,101010" });
            memberGroups.Add(new MemberGroup() { GroupFId = 101010, GroupId = 10101011, GroupName = "南山中学", Path = "0,10,1010,101010" });
            memberGroups.Add(new MemberGroup() { GroupFId = 101010, GroupId = 10101012, GroupName = "电信", Path = "0,10,1010,101010" });
            memberGroups.Add(new MemberGroup() { GroupFId = 1011, GroupId = 101110, GroupName = "泌尿外科", Path = "0,10,1011" });
            memberGroups.Add(new MemberGroup() { GroupFId = 101110, GroupId = 10111011, GroupName = "心内科", Path = "0,10,1011,101110" });
            memberGroups.Add(new MemberGroup() { GroupFId = 101110, GroupId = 10111012, GroupName = "膀胱癌", Path = "0,10,1011,101110" });
            memberGroups.Add(new MemberGroup() { GroupFId = 101110, GroupId = 10111013, GroupName = "前列腺癌", Path = "0,10,1011,101110" });
            return memberGroups;
        }
    }

    public class MemberGroup
    {
        public int GroupId { get; set; }

        public string GroupName { get; set; }

        public int GroupFId { get; set; }

        public string Path { get; set; }
    }
}