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：

复制代码 代码如下:

<script type="text/javascript" src="~/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))

}

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。