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：
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。
