LayUi框架中树形组件tree官方还在持续完善中，目前最新版本为v2.5.5
官方树形组件目前还不支持懒加载方式，之前我修改一版是通过reload重载实例方法填充子节点数据方式，因为递归页面元素时存在效率问题，最终放弃升级。
本次重新star了官方最新tree.js源码，在其基础上扩展了子节点懒加载模式方法，data数据参数中增加了lazy: true，开启懒加载模式，需要配合spread事件使用。
部分源码修改截图：
调用例子：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<meta name="renderer" content="webkit|ie-comp|ie-stand">
<meta http-equiv="hg-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no">
<meta http-equiv="Cache-Control" content="no-siteapp" />
<link rel="stylesheet" href="./css/font.css">
<link rel="stylesheet" href="../lib/layui/css/layui.css" media="all">
<link rel="stylesheet" href="./lib/admin/admin.css" media="all">
<link rel="stylesheet" href="./lib/Scrollbar/jquery.scrollbar.css">
<script type="text/javascript" src="./lib/admin/jquery-1.9.1.min.js"></script>
<script type="text/javascript" src="./lib/Scrollbar/jquery.scrollBar.js"></script>
<script type="text/javascript" src="./lib/layui/layui.js"></script>
<script type="text/javascript" src="./lib/admin/admin.js"></script>
<!--[if lt IE 9]>
<script src="https://cdn.staticfile.org/html5shiv/r29/html5.min.js"></script>
<script src="https://cdn.staticfile.org/respond.js/1.4.2/respond.min.js"></script>
<![endif]-->
<style>
.demo-tree{
width: 500px; height: 200px;
}
.demo-tree-box{
width: 500px; height: 200px;border: 1px #eee solid;overflow-y: auto;
}
.demo-input-tree{
height: auto;
width: 100%;
display: none;
position: absolute;
top: 100%;
background-color: #fff;
z-index: 100;
max-height: 400px;
}
.layui-input{
width: 500px;
cursor: pointer;
}
</style>
</head>
<body class="layui-body-content">
<div class="layui-fluid">
<div class="layui-card">
<div class="layui-form layui-card-header layui-card-header-auto">
<div class="layui-form-item">
<label class="layui-form-label">部门：</label>
<div class="layui-inline">
<input type="text" name="dept" lay-verify="required" placeholder="请选择部门" autocomplete="off" class="layui-input" readonly="true">
<div id="treeinputid" class="demo-input-tree demo-tree-box"></div>
</div>
<div class="layui-inline layui-show-xs-block">
<button class="layui-btn layui-btn-lg layui-btn-normal" lay-submit lay-filter="sreach"><i
class="layui-icon layui-icon-lg"></i></button>
</div>
</div>
</div>
<div class="layui-card-body">
<div class="layui-card-header">
<button class="layui-btn layui-btn-lg layui-btn-normal"
onclick="getChecked()"><i
class="layui-icon"></i>获取选中</button>
<button class="layui-btn layui-btn-lg layui-btn-warm" onclick="setChecked()"><i
class="layui-icon"></i>设置节点勾选</button>
<button class="layui-btn layui-btn-lg layui-btn-danger" onclick="reload()"><i
class="layui-icon"></i>实例重载</button>
</div>
<div class="demo-tree">
<div id="treeid" class="demo-tree demo-tree-box"></div>
</div>
</div>
</div>
<div class="layui-floor">
<blockquote class="layui-elem-quote layui-quote-nm">Copyright©2019-2020, 本系统由@一如既往，提供技术支持！
</blockquote>
</div>
</div>
</body>
<script>
//初始化
layui.use(['tree'], function () {
var tree = layui.tree;
//treeid
var inst1 = tree.render({
elem: '#treeid',
id: 'treeid', //定义索引
showCheckbox: true, //是否显示复选框
showLine: true, //是否开启连接线。默认 true，若设为 false，则节点左侧出现三角图标。
accordion: false, //是否开启手风琴模式，默认 false
onlyIconControl: false, //是否仅允许节点左侧图标控制展开收缩。默认 false
isJump: false, //是否允许点击节点时弹出新窗口跳转。默认 false
data: [{
id: 'hg-100',
field: '1',
level: '1',
title: '父节点100',
spread: true,
children: [{
id: 'hg-100101',
field: '3',
level: '2',
title: '子节点100101',
children: [{
id: 'hg-100101101',
field: '4',
level: '3',
title: '子节点100101101'
}, {
id: 'hg-100101102',
field: '5',
level: '3',
title: '子节点100101102'
}, {
id: 'hg-100101103',
field: '6',
level: '3',
title: '子节点100101103'
}]
}]
}, {
id: 'hg-200',
field: '2',
level: '1',
title: '父节点200',
lazy: true
}],
text: {
defaultNodeName: '无数据',
none: '加载数据失败！'
},
click: function (obj) {
console.log(obj.data); //得到当前点击的节点数据
console.log(obj.state); //得到当前节点的展开状态：open、close、normal
console.log(obj.elem); //得到当前节点元素
console.log(obj.data.children); //当前节点下是否有子节点
},
oncheck: function (obj) {
console.log(obj.data); //得到当前点击的节点数据
console.log(obj.checked); //得到当前节点的展开状态：open、close、normal
console.log(obj.elem); //得到当前节点元素
},
spread: function (obj) {
console.log(obj);
if(obj.state=='open'){
setTimeout(() => {
tree.lazytree(inst1.config.id, obj.elem, getTreeJson(obj.data.id));
}, 2000);
}
}
});
//treeinput
var inst2;
$("[name='dept']").on("click",function (e) {
e.stopPropagation();
const deprt = this;
if(!inst2){
inst2 = tree.render({
elem: '#treeinputid',
id: 'treeinputid', //定义索引
showCheckbox: true, //是否显示复选框
showLine: true, //是否开启连接线。默认 true，若设为 false，则节点左侧出现三角图标。
accordion: false, //是否开启手风琴模式，默认 false
onlyIconControl: false, //是否仅允许节点左侧图标控制展开收缩。默认 false
isJump: false, //是否允许点击节点时弹出新窗口跳转。默认 false
data: [{
id: 'hg-100',
field: '1',
level: '1',
title: '父节点100',
spread: true,
children: [{
id: 'hg-100101',
field: '3',
level: '2',
title: '子节点100101',
children: [{
id: 'hg-100101101',
field: '4',
level: '3',
title: '子节点100101101'
}, {
id: 'hg-100101102',
field: '5',
level: '3',
title: '子节点100101102'
}, {
id: 'hg-100101103',
field: '6',
level: '3',
title: '子节点100101103'
}]
}]
}, {
id: 'hg-200',
field: '2',
level: '1',
title: '父节点200',
lazy: true
}],
text: {
defaultNodeName: '无数据',
none: '加载数据失败！'
},
click: function (obj) {
console.log(obj.data); //得到当前点击的节点数据
console.log(obj.state); //得到当前节点的展开状态：open、close、normal
console.log(obj.elem); //得到当前节点元素
console.log(obj.data.children); //当前节点下是否有子节点
},
oncheck: function (obj) {
var checkData = tree.getChecked(inst2.config.id);
var map = getmap(checkData);
$(deprt).val(map.value.join(','));
},
spread: function (obj) {
console.log(obj);
if(obj.state=='open'){
setTimeout(() => {
tree.lazytree(inst2.config.id, obj.elem, getTreeJson(obj.data.id));
}, 2000);
}
}
});
}
$("#treeinputid").toggle();
})
//监听表单提交事件
hg.form.onsubmit('sreach', function (data) {
$("#treeinputid").hide();
var checkData = tree.getChecked(inst2.config.id);
var map = getmap(checkData);
var init = map.result;
hg.msg(JSON.stringify(init));
});
const getmap = (target, result = []) => {
layui.each(target,(i,e)=>{
e.id && result.push({id:e.id,title:e.title});
e.children && getmap(e.children, result);
});
let titles = result.map(e=>{return e.title});
return {value:titles,result:result};
};
});
// 模拟后台返回数据
function getTreeJson(id) {
if (id === 'hg-200') {
return [{
id: 'hg-200101',
level: '2',
title: '子节点200101'
}, {
id: 'hg-200102',
level: '2',
title: '子节点200102',
lazy: true
}];
}
if (id === 'hg-200102') {
return [{
id: 'hg-200102101',
level: '3',
title: '子节点200102101'
}, {
id: 'hg-200102102',
level: '3',
title: '子节点200102102',
lazy: true
}];
}
if (id === 'hg-200102102') {
return [{
id: 'hg-200102102101',
level: '4',
title: '子节点200102102101'
}, {
id: 'hg-200102102102',
level: '4',
title: '子节点200102102102',
}];
}
}
//获得选中的节点
function getChecked(){
layui.use(['tree'], function () {
var tree = layui.tree;
var checkData = tree.getChecked('treeid');
hg.msg(JSON.stringify(checkData));
});
}
//设置节点勾选
function setChecked(){
layui.use(['tree'], function () {
var tree = layui.tree;
tree.setChecked('treeid', ['hg-100101101','hg-100101102']);
});
}
//实例重载
function reload(){
layui.use(['tree'], function () {
var tree = layui.tree;
tree.reload('treeid', {
});
});
}
</script>
</html>
<script>
//初始化
layui.use(['tree'], function () {
var tree = layui.tree;
//treeid
var inst1 = tree.render({
elem: '#treeid',
id: 'treeid', //定义索引
showCheckbox: true, //是否显示复选框
showLine: true, //是否开启连接线。默认 true，若设为 false，则节点左侧出现三角图标。
accordion: false, //是否开启手风琴模式，默认 false
onlyIconControl: false, //是否仅允许节点左侧图标控制展开收缩。默认 false
isJump: false, //是否允许点击节点时弹出新窗口跳转。默认 false
data: [{
id: 'hg-100',
field: '1',
level: '1',
title: '父节点100',
spread: true,
children: [{
id: 'hg-100101',
field: '3',
level: '2',
title: '子节点100101',
children: [{
id: 'hg-100101101',
field: '4',
level: '3',
title: '子节点100101101'
}, {
id: 'hg-100101102',
field: '5',
level: '3',
title: '子节点100101102'
}, {
id: 'hg-100101103',
field: '6',
level: '3',
title: '子节点100101103'
}]
}]
}, {
id: 'hg-200',
field: '2',
level: '1',
title: '父节点200',
lazy: true
}],
text: {
defaultNodeName: '无数据',
none: '加载数据失败！'
},
click: function (obj) {
console.log(obj.data); //得到当前点击的节点数据
console.log(obj.state); //得到当前节点的展开状态：open、close、normal
console.log(obj.elem); //得到当前节点元素
console.log(obj.data.children); //当前节点下是否有子节点
},
oncheck: function (obj) {
console.log(obj.data); //得到当前点击的节点数据
console.log(obj.checked); //得到当前节点的展开状态：open、close、normal
console.log(obj.elem); //得到当前节点元素
},
spread: function (obj) {
console.log(obj);
if(obj.state=='open'){
setTimeout(() => {
tree.lazytree(inst1.config.id, obj.elem, getTreeJson(obj.data.id));
}, 2000);
}
}
});
//treeinput
var inst2;
$("[name='dept']").on("click",function (e) {
e.stopPropagation();
const deprt = this;
if(!inst2){
inst2 = tree.render({
elem: '#treeinputid',
id: 'treeinputid', //定义索引
showCheckbox: true, //是否显示复选框
showLine: true, //是否开启连接线。默认 true，若设为 false，则节点左侧出现三角图标。
accordion: false, //是否开启手风琴模式，默认 false
onlyIconControl: false, //是否仅允许节点左侧图标控制展开收缩。默认 false
isJump: false, //是否允许点击节点时弹出新窗口跳转。默认 false
data: [{
id: 'hg-100',
field: '1',
level: '1',
title: '父节点100',
spread: true,
children: [{
id: 'hg-100101',
field: '3',
level: '2',
title: '子节点100101',
children: [{
id: 'hg-100101101',
field: '4',
level: '3',
title: '子节点100101101'
}, {
id: 'hg-100101102',
field: '5',
level: '3',
title: '子节点100101102'
}, {
id: 'hg-100101103',
field: '6',
level: '3',
title: '子节点100101103'
}]
}]
}, {
id: 'hg-200',
field: '2',
level: '1',
title: '父节点200',
lazy: true
}],
text: {
defaultNodeName: '无数据',
none: '加载数据失败！'
},
click: function (obj) {
console.log(obj.data); //得到当前点击的节点数据
console.log(obj.state); //得到当前节点的展开状态：open、close、normal
console.log(obj.elem); //得到当前节点元素
console.log(obj.data.children); //当前节点下是否有子节点
},
oncheck: function (obj) {
var checkData = tree.getChecked(inst2.config.id);
var map = getmap(checkData);
$(deprt).val(map.value.join(','));
},
spread: function (obj) {
console.log(obj);
if(obj.state=='open'){
setTimeout(() => {
tree.lazytree(inst2.config.id, obj.elem, getTreeJson(obj.data.id));
}, 2000);
}
}
});
}
$("#treeinputid").toggle();
})
//监听表单提交事件
hg.form.onsubmit('sreach', function (data) {
$("#treeinputid").hide();
var checkData = tree.getChecked(inst2.config.id);
var map = getmap(checkData);
var init = map.result;
hg.msg(JSON.stringify(init));
});
const getmap = (target, result = []) => {
layui.each(target,(i,e)=>{
e.id && result.push({id:e.id,title:e.title});
e.children && getmap(e.children, result);
});
let titles = result.map(e=>{return e.title});
return {value:titles,result:result};
};
});
// 模拟后台返回数据
function getTreeJson(id) {
if (id === 'hg-200') {
return [{
id: 'hg-200101',
level: '2',
title: '子节点200101'
}, {
id: 'hg-200102',
level: '2',
title: '子节点200102',
lazy: true
}];
}
if (id === 'hg-200102') {
return [{
id: 'hg-200102101',
level: '3',
title: '子节点200102101'
}, {
id: 'hg-200102102',
level: '3',
title: '子节点200102102',
lazy: true
}];
}
if (id === 'hg-200102102') {
return [{
id: 'hg-200102102101',
level: '4',
title: '子节点200102102101'
}, {
id: 'hg-200102102102',
level: '4',
title: '子节点200102102102',
}];
}
}
//获得选中的节点
function getChecked(){
layui.use(['tree'], function () {
var tree = layui.tree;
var checkData = tree.getChecked('treeid');
hg.msg(JSON.stringify(checkData));
});
}
//设置节点勾选
function setChecked(){
layui.use(['tree'], function () {
var tree = layui.tree;
tree.setChecked('treeid', ['hg-100101101','hg-100101102']);
});
}
//实例重载
function reload(){
layui.use(['tree'], function () {
var tree = layui.tree;
tree.reload('treeid', {
});
});
}
</script>
【HG-Layui-UI通用后台管理框架V1.0版】
下载地址：
https://www.cnblogs.com/han1982/p/12003454.html
tree.js 下载地址在回复区可见。（layui-v2.5.5版本替换tree.js可用）
来源：oschina
链接：https://my.oschina.net/u/4328465/blog/3348309