layui动态渲染生成左侧3级菜单的方法(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 = '
';
 for (var i = 0; i < data.length; i++) {
  if (data[i].spread) {
  ulHtml += '
';
  } else {
  ulHtml += '
';
  }
  if (data[i].children !== undefined && data[i].children !== null && data[i].children.length > 0) {
  ulHtml += '' + data[i].title;
  ulHtml += '';
  ulHtml += '';
  ulHtml += '
';
  //二级菜单
  for (var j = 0; j < data[i].children.length; j++) {
   //是否有孙子节点
   if (data[i].children[j].children !== undefined && data[i].children[j].children !== null && data[i].children[j].children.length > 0) {
   ulHtml += '
';
   ulHtml += '' + data[i].children[j].title;
   ulHtml += '';
   ulHtml += '';
   //三级菜单
   ulHtml += '
';
    var grandsonNodes = data[i].children[j].children;
    for (var k = 0; k < grandsonNodes.length; k++) {
    ulHtml += '
';
    ulHtml += '' + grandsonNodes[k].title + '';
    ulHtml += '
';
    }
   ulHtml += '
';
   ulHtml += '
';
   }else{
   ulHtml += '
';
   ulHtml += '' + data[i].children[j].title;
   ulHtml += '';
   ulHtml += '
';
   }
   //ulHtml += '
'; 
  }
  ulHtml += '
';
  } else {
  var dataUrl = (data[i].href !== undefined && data[i].href !== '') ? 'data-url="' + data[i].href + '"' : '';
  //ulHtml += '';
  ulHtml += '';
  if (data[i].icon !== undefined && data[i].icon !== '') {
   if (data[i].icon.indexOf('fa-') !== -1) {
   ulHtml += '';
   } else {
   ulHtml += '' + data[i].icon + '';
   }
  }
  ulHtml += '' + data[i].title + '';
  ulHtml += '';
  }
  ulHtml += '
';
 }
 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"
 
 }
]

总结：渲染dom,只要的思路就是用了2次for循环，遍历后台返回的数据。

以上这篇layui动态渲染生成左侧3级菜单的方法(根据后台返回数据)就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。