<ul id="tt1" class="easyui-tree"><li>  <span>Folder</span><ul><li><span>Sub Folder 1</span><ul>  <li><span><a href="#">File 11</a></span>  </li></ul></li><li><span>File 2</span>  </li><li><span>File 3</span>  </li></ul></li><li><span>File21</span>  </li></ul>

<script type="text/javascript">$(function () {var data = [{text: 'Item1',state: 'closed',children: [{text: 'Item11'}, {text: 'Item12'}]}, {text: 'Item2'}];$('#tt1').tree();  //首先初始化树结构$('#tt1').tree('loadData', data);});
</script>

<script type="text/javascript">$(function () {$('#tt').tree({lines: true,  //显示格式控制url: '/Ajax/Parameter/AA40.ashx?Method=InitTree',/*************每次打开所有节点*************************/onLoadSuccess: function (node, data) {var t = $(this);if (data) {$(data).each(function (index, d) {if (this.state == 'closed') {t.tree('expandAll');}});}/***********选中指定id的节点****************/var node = $('#tt').tree('find', 410);$('#tt').tree('select', node.target);          },/**************点击节点展开或关闭树形结构***************/onClick: function (node) {if (node.state == 'closed') {$(this).tree('expand', node.target);console.info(node.target);} else {$(this).tree('collapse', node.target);}},onDblClick: function (node) {var g = $(this).tree('getParent', node.target);   //获取选中节点的父节点
                }});});</script>View Code 

        /// <summary>/// 初始化树结构/// </summary>public void InitTree(){com.zhonghui.bll.sys bll = new bll.sys();DataSet ds = bll.GetList("");if (ds.Tables[0].Rows.Count > 0){string strWhere = string.IsNullOrEmpty(Request["id"]) == true ? " sysPID IS NULL" : " sysPID='" + Request["id"] + "'";string s = GetTreeJson(ds.Tables[0], "sysID", "sysName", "sysPID", strWhere);Response.Write(s);   }}           /// <summary>/// 根据DataTable生成Json树结构  【异步加载树结构】/// </summary>/// <param name="tabel">table列表</param>/// <param name="nodeID">节点id</param>/// <param name="nodeName">节点名称</param>/// <param name="pNodeID">父节点ID</param>/// <param name="strWhere">条件</param>/// <returns></returns>public string GetTreeJson(DataTable tabel, string nodeID, string nodeName, string pNodeID, string strWhere){StringBuilder strJson = new StringBuilder();strJson.Append("[");DataRow[] rows = tabel.Select(strWhere);if (rows.Length > 0){foreach (DataRow row in rows){strJson.Append("{\"id\":\"" + row[nodeID] + "\",\"text\":\"" + row[nodeName]);if (tabel.Select(string.Format("{0}='{1}'", pNodeID, row[nodeID])).Length > 0){strJson.Append("\",\"state\":\"closed\"");}else{strJson.Append("\",\"state\":\"open\"");}strJson.Append("},");}strJson = strJson.Remove(strJson.Length - 1, 1);}strJson.Append("]");return strJson.ToString();}