layui动态渲染生成左侧3级菜单（根据后台返回数据）
声明：这里非常感谢闲心大神，开源了非常好用的前端UI框架，layui，如有侵权请联系我。当然闲心在2.0版本的layuiAdmin已经支持了，不过是收费版的，需要的同学可以自行购买，网址：http://www.layui.com/admin/pro/
本人在做管理后台事用到了左侧的导航列表，但是管理后台进来的菜单是根据不同账户的权限，显示不同的菜单。这时候需要动态的渲染左侧的列表。但是1.0版本只是更新到2级菜单，不满足如下图的3级菜单需求，只能自己动手，改造源码
话不多说，上代码：
1.html部分，我需要一个容器用于渲染菜单
接下来是插件以及相关JS,css引入 ，注意：路径问题，换成自己本地的路径
2.js部分
重点来了：navbar,js
/**
* navbar.js
* @author 御风 <[email protected]>
*/
layui.define(['element', 'common'], function (exports) {
"use strict";
var $ = layui.jquery,
layer = parent.layer === undefined ? layui.layer : parent.layer,
element = layui.element,
common = layui.common,
cacheName = 'tb_navbar';
var Navbar = function () {
/**
* 默认配置
*/
this.config = {
elem: undefined, //容器
data: undefined, //数据源
url: undefined, //数据源地址
type: 'GET', //读取方式
cached: false, //是否使用缓存
spreadOne: false //设置是否只展开一个二级菜单
};
this.v = '1.0.0';
};
//渲染
Navbar.prototype.render = function () {
var _that = this;
var _config = _that.config;
if (typeof (_config.elem) !== 'string' && typeof (_config.elem) !== 'object') {
common.throwError('Navbar error: elem参数未定义或设置出错，具体设置格式请参考文档API.');
}
var $container;
if (typeof (_config.elem) === 'string') {
$container = $('' + _config.elem + '');
}
if (typeof (_config.elem) === 'object') {
$container = _config.elem;
}
if ($container.length === 0) {
common.throwError('Navbar error:找不到elem参数配置的容器，请检查.');
}
if (_config.data === undefined && _config.url === undefined) {
common.throwError('Navbar error:请为Navbar配置数据源.')
}
if (_config.data !== undefined && typeof (_config.data) === 'object') {
var html = getHtml(_config.data);
$container.html(html);
element.init();
_that.config.elem = $container;
} else {
if (_config.cached) {
var cacheNavbar = layui.data(cacheName);
if (cacheNavbar.navbar === undefined) {
$.ajax({
type: _config.type,
url: _config.url,
async: false, //_config.async,
dataType: 'json',
success: function (result, status, xhr) {
//添加缓存
layui.data(cacheName, {
key: 'navbar',
value: result
});
var html = getHtml(result);
$container.html(html);
element.init();
},
error: function (xhr, status, error) {
common.msgError('Navbar error:' + error);
},
complete: function (xhr, status) {
_that.config.elem = $container;
}
});
} else {
var html = getHtml(cacheNavbar.navbar);
$container.html(html);
element.init();
_that.config.elem = $container;
}
} else {
//清空缓存
layui.data(cacheName, null);
$.ajax({
type: _config.type,
url: _config.url,
async: false, //_config.async,
dataType: 'json',
success: function (result, status, xhr) {
var html = getHtml(result);
$container.html(html);
element.init();
},
error: function (xhr, status, error) {
common.msgError('Navbar error:' + error);
},
complete: function (xhr, status) {
_that.config.elem = $container;
}
});
}
}
//只展开一个二级菜单
if (_config.spreadOne) {
var $ul = $container.children('ul');
$ul.find('li.layui-nav-item').each(function () {
$(this).on('click', function () {
$(this).siblings().removeClass('layui-nav-itemed');
});
});
}
return _that;
};
/**
* 配置Navbar
* @param {Object} options
*/
Navbar.prototype.set = function (options) {
var that = this;
that.config.data = undefined;
$.extend(true, that.config, options);
return that;
};
/**
* 绑定事件
* @param {String} events
* @param {Function} callback
*/
Navbar.prototype.on = function (events, callback) {
var that = this;
var _con = that.config.elem;
if (typeof (events) !== 'string') {
common.throwError('Navbar error:事件名配置出错，请参考API文档.');
}
var lIndex = events.indexOf('(');
var eventName = events.substr(0, lIndex);
var filter = events.substring(lIndex + 1, events.indexOf(')'));
if (eventName === 'click') {
if (_con.attr('lay-filter') !== undefined) {
_con.children('ul').find('li').each(function () {
var $this = $(this);
if ($this.find('dl').length > 0) {
var $dd = $this.find('dd').each(function () {
$(this).on('click', function () {
var $a = $(this).children('a');
var href = $a.data('url');
var icon = $a.children('i:first').data('icon');
var title = $a.children('cite').text();
var data = {
elem: $a,
field: {
href: href,
icon: icon,
title: title
}
}
callback(data);
});
});
} else {
$this.on('click', function () {
var $a = $this.children('a');
var href = $a.data('url');
var icon = $a.children('i:first').data('icon');
var title = $a.children('cite').text();
var data = {
elem: $a,
field: {
href: href,
icon: icon,
title: title
}
}
callback(data);
});
}
});
}
}
};
/**
* 清除缓存
*/
Navbar.prototype.cleanCached = function () {
layui.data(cacheName, null);
};
/**
* 获取html字符串
* @param {Object} data
*/
function getHtml(data) {
var ulHtml = '';
return ulHtml;
}
var navbar = new Navbar();
exports('navbar', function (options) {
return navbar.set(options);
});
});公共配置common.js
/**
* common.js
* @author 御风 <[email protected]>
*/
layui.define(['layer'], function(exports) {
"use strict";
var $ = layui.jquery,
layer = layui.layer;
var common = {
/**
* 抛出一个异常错误信息
* @param {String} msg
*/
throwError: function(msg) {
throw new Error(msg);
return;
},
/**
* 弹出一个错误提示
* @param {String} msg
*/
msgError: function(msg) {
layer.msg(msg, {
icon: 5
});
return;
}
};
exports('common', common);
});3.返回数据json格式
[
{
"title": "首页",
"icon": " ",
"spread": true,
"href": ""
},
{
"title": "一级导航",
"icon": "fa-stop-circle",
"spread": true,
"href": "http://www.baidu.com",
"children": [
{
"title": "二级导航",
"icon": "",
"href": "lala.html",
"spread": true,
"children": [
{
"title": "三级导航",
"icon": " ",
"href": "button.html"
},
{
"title": "三级导航",
"icon": " ",
"href": "buttwswon.html"
}
]
}
]
},
{
"title": "一级导航",
"icon": "fa-stop-circle",
"spread": true,
"href": "http://www.baidu.com"
},
{
"title": "一级导航",
"icon": "fa-stop-circle",
"spread": true,
"href": "http://www.baidu.com"
},
{
"title": "一级导航",
"icon": "fa-stop-circle",
"spread": true,
"href": "http://www.baidu.com"
}
]