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。
