本文实例为大家讲解了jquery zTree树插件的基本使用方法，具体内容如下

一、节点模糊搜索功能：搜索成功后，自动高亮显示并定位、展开搜索到的节点。

二、节点异步加载：1、点击展开时加载数据；2、选中节点时加载数据。
前台代码如下：

<script type="text/javascript">
 //ztree设置
 var setting = {
 view: {
 fontCss: getFontCss
 },
 check: {
 enable: true
 },
 data: {
 simpleData: {
 enable: true,
 idKey: "id",
 pIdKey: "pId",
 rootPId: 0
 }
 },
 async: {
 enable: true,
 url: "#{getStudentsJsonUrl}",
 autoParam: ["id", "level"]
 },
 callback: {
 beforeCheck: zTreeBeforeCheck,
 onNodeCreated: zTreeOnNodeCreated,
 beforeExpand: zTreeBeforeExpand
 }
 };

 var reloadFlag = false; //是否重新异步请求
 var checkFlag = true; //是否选中

 //节点展开前
 function zTreeBeforeExpand(treeId, treeNode) {
 reloadFlag = false;
 return true;
 };

 //节点创建后
 function zTreeOnNodeCreated(event, treeId, treeNode) {
 var zTree = $.fn.zTree.getZTreeObj(treeId);
 if (reloadFlag) {
 if (checkFlag) {
 zTree.checkNode(treeNode, true, true);
 }
 if (!treeNode.children) {
 zTree.reAsyncChildNodes(treeNode, "refresh");
 }
 }
 };

 //选中节点前
 function zTreeBeforeCheck(treeId, treeNode) {
 var zTree = $.fn.zTree.getZTreeObj(treeId);
 if (!treeNode.children) {
 reloadFlag = true;
 checkFlag = true;
 zTree.reAsyncChildNodes(treeNode, "refresh");
 }
 return true;
 }

 //页面加载完成
 _run(function () {
 require(['zTree/js/jquery.ztree.all-3.5'], function () {
 $.ajax({
 type: "POST",
 url: "#{getStudentsJsonUrl}",
 success: function (data) {
 if (data && data.length != 0) { //如果结果不为空
 $.fn.zTree.init($("#tree"), setting, data);
 }
 else { //搜索不到结果

 }
 }
 });
 });

 //提交
 $("#inputSubmit").click(function () {
 var zTree = $.fn.zTree.getZTreeObj("tree");
 var nodes = zTree.getCheckedNodes(true);
 var ids = "";
 var names = "";
 for (var i = 0; i < nodes.length; i++) { //遍历选择的节点集合
 if (!nodes[i].isParent) {
 ids += nodes[i].id.replace("level" + nodes[i].level, "") + ",";
 names += nodes[i].name + ",";
 }
 }
 Simpo.ui.box.hideBox();
 parent.$(".boxFrm").contents().find("#inputRange").val(names.substr(0, names.length - 1));
 parent.$(".boxFrm").contents().find("#hidRange").val(ids.substr(0, ids.length - 1));
 })
 });

 //查找节点
 var lastNodeList = [];
 var lastKey;
 function searchNode() {
 var zTree = $.fn.zTree.getZTreeObj("tree");

 var key = $.trim($("#inputSearchNode").val());
 if (key != "" && key != lastKey) {
 nodeList = zTree.getNodesByParamFuzzy("name", key);
 for (var i = 0, l = lastNodeList.length; i < l; i++) { //上次查询的节点集合取消高亮
 lastNodeList[i].highlight = false;
 zTree.updateNode(lastNodeList[i]);
 }
 zTree.expandAll(false); //全部收缩
 if (nodeList.length > 0) {
 for (var i = 0, l = nodeList.length; i < l; i++) { //遍历找到的节点集合
 if (nodeList[i].getParentNode()) {
 zTree.expandNode(nodeList[i].getParentNode(), true, false, false); //展开其父节点
 }
 nodeList[i].highlight = true;
 zTree.updateNode(nodeList[i]);
 }
 }
 zTree.refresh(); // 很重要，否则节点状态更新混乱。
 lastNodeList = nodeList;
 lastKey = key;
 }
 }

 //加载数据
 function loadData() {
 var zTree = $.fn.zTree.getZTreeObj("tree");
 var rootNodes = zTree.getNodes();
 reloadFlag = true;
 checkFlag = false;
 for (var i = 0; i < rootNodes.length; i++) {
 if (!rootNodes[i].children) {
 zTree.reAsyncChildNodes(rootNodes[i], "refresh"); //异步加载
 }
 }
 }

 //全部收缩
 function closeAll() {
 var zTree = $.fn.zTree.getZTreeObj("tree");
 if ($("#inputCloseAll").val() == "全部收缩") {
 zTree.expandAll(false);
 $("#inputCloseAll").val("全部展开")
 }
 else {
 zTree.expandAll(true);
 $("#inputCloseAll").val("全部收缩")
 }
 }

 //高亮样式
 function getFontCss(treeId, treeNode) {
 return (treeNode.highlight) ? { color: "#A60000", "font-weight": "bold"} : { color: "#333", "font-weight": "normal" };
 }
</script>

<div style="width: 200px; height: 260px; overflow: auto; border: solid 1px #666;">
 <ul id="tree" class="ztree">
 </ul>
 </div>

后台代码（后台返回Json数据）：

 public void SelStudent()
 {
 set("getStudentsJsonUrl", to(GetStudentsJson));
 }

 public void GetStudentsJson()
 {
 List<Dictionary<string, string>> dicList = new List<Dictionary<string, string>>();

 string level = ctx.Post("level");
 string id = ctx.Post("id");
 if (strUtil.IsNullOrEmpty(id))
 {
 #region 加载班级
 //获取当前登录用户
 Sys_User user = AdminSecurityUtils.GetLoginUser(ctx);
 //获取当前用户关联的老师
 Edu_Teacher teacher = edu_TeacService.FindByUserId(user.Id);
 //获取班级集合
 List<Edu_ClaNameFlow> list = edu_ClaNameFlowService.GetListByTeacherId(teacher.Id);
 foreach (Edu_ClaNameFlow item in list)
 {
 Dictionary<string, string> dic = new Dictionary<string, string>();
 dic.Add("id", "level0" + item.Calss.Id.ToString());
 dic.Add("pId", "0");
 dic.Add("name", item.Gra.Name + item.Calss.Name);
 dic.Add("isParent", "true");
 dicList.Add(dic);
 }
 #endregion
 }
 else
 {
 if (level == "0")
 {
 //加载学生
 List<Edu_Student> list = edu_StudService.GetListByClassId(id.Replace("level0", ""));
 foreach (Edu_Student item in list)
 {
 Dictionary<string, string> dic = new Dictionary<string, string>();
 dic.Add("id", "level1" + item.Id.ToString());
 dic.Add("pId", id);
 dic.Add("name", item.Name);
 dic.Add("isParent", "false");
 dicList.Add(dic);
 }
 }
 }

 echoJson(dicList);
 }

三、基于cookie实现zTree树刷新后，展开状态不变

1、除了引用jQuery和zTree的JS外，引用cookie的JS：

<script type="text/javascript" src="http://www.gimoo.net/t/1903/~/Scripts/jquery-treeview/lib/jquery.cookie.js"></script>

2、JS代码：

$(function () {
 //ztree设置
 var setting = {
 data: {
  simpleData: {
  enable: true,
  idKey: "id",
  pIdKey: "pId",
  rootPId: null
  }
 },
 callback: {
  onExpand: onExpand,
  onCollapse: onCollapse
 }
 };

 $.ajax({
 type: "POST",
 url: "/Tech/TemplateTypeManage/GetData",
 success: function (data) {
  if (data && data.length != 0) {
  $.fn.zTree.init($("#tree"), setting, data);
  var treeObj = $.fn.zTree.getZTreeObj("tree");
  var cookie = $.cookie("z_tree" + window.location);
  if (cookie) {
   z_tree = JSON2.parse(cookie);
   for (var i = 0; i < z_tree.length; i++) {
   var node = treeObj.getNodeByParam('id', z_tree[i])
   treeObj.expandNode(node, true, false)
   }
  }
  }
 }
 });
});//end $

function onExpand(event, treeId, treeNode) {
 var cookie = $.cookie("z_tree" + window.location);
 var z_tree = new Array();
 if (cookie) {
 z_tree = JSON2.parse(cookie);
 }
 if ($.inArray(treeNode.id, z_tree) < 0) {
 z_tree.push(treeNode.id);
 }
 $.cookie("z_tree" + window.location, JSON2.stringify(z_tree))
}

function onCollapse(event, treeId, treeNode) {
 var cookie = $.cookie("z_tree" + window.location);
 var z_tree = new Array();
 if (cookie) {
 z_tree = JSON2.parse(cookie);
 }
 var index = $.inArray(treeNode.id, z_tree);
 z_tree.splice(index, 1);
 for (var i = 0; i < treeNode.children.length; i++) {
 index = $.inArray(treeNode.children[i].id, z_tree);
 if (index > -1) z_tree.splice(index, 1);
 }
 $.cookie("z_tree" + window.location, JSON2.stringify(z_tree))
}

更多关于ztree控件的内容，请参考专题《jQuery插件ztree使用汇总》

以上就是关于树插件zTree异步加载、模糊搜索简单实例讲解，希望对大家的学习有所帮助。