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1、前言
之前《Vue前端访问控制方案 》一文中提出,使用class=“permissions”结合元素id来标识权限控制相关的dom元素,并通过公共方法checkRights来设置dom元素的可见属性,在实际使用中存在下列问题:
- checkRights指定上级节点的domKey,结果document.getElementsByClassName获取了更上级的节点或其它子树的节点,没在指定上级节点下,结果节点没找到,导致错误禁用其它节点的权限。
- style.display与v-if存在可见属性冲突。
- 更为致命的是,document.getElementsByClassName找不到插槽的节点,如下列形式:
<el-table-column label="操作"> <template slot-scope="scope"> <el-tooltip class="item,permissions" effect="dark" content="编辑" id="editUser" placement="left-start"> <el-button size="mini" type="primary" icon="el-icon-edit" circle @click="editUser(scope.row)"></el-button> </el-tooltip> <el-tooltip class="item,permissions" effect="dark" content="禁用" id="disableUser" placement="left-start" v-if="!scope.row.deleteFlag"> <el-button size="mini" type="primary" icon="el-icon-lock" circle @click="disableUser(scope.row)"></el-button> </el-tooltip> <el-tooltip class="item,permissions" effect="dark" content="启用" id="enableUser" placement="left-start" v-if="scope.row.deleteFlag"> <el-button size="mini" type="primary" icon="el-icon-unlock" circle @click="enableUser(scope.row)"></el-button> </el-tooltip> </template> </el-table-column>
此时,document.getElementsByClassName方法找不到class中有permissions的对象。Vue与JQuery的思想有很大不同。
综上所述问题,因此需要对方案进行优化改进。
2、新的方案
借鉴v-permission的Vue指令方法,并且不再使用可见属性,而是移除无权限节点的dom元素。具体方案如下:
2.1、定义v-permissions指令
为区别"v-permission"及":v-permission",这里使用v-permissions。
创建/src/common/permissions.js文件,代码如下:
import TreeNode from './treeNode.js' /** * 对使用v-permissions指令的dom元素,检查权限;如果无权限,则移除该元素 * 绑定参数形式: * v-permissions 无参数值形式,表示不指定上级节点的domKey * v-permissions="''",设置空串,注意里面需要包含单引号,也是无参数 * v-permissions="'someSuperDomkey'",设置上级节点的domKey,注意里面需要包含单引号 * @param {element对象} el * @param {绑定参数} binding */ function checkRights(el,binding){ // 确保权限树已经加载 if (TreeNode.rightsTree == null){ let rights = localStorage.getItem('rights'); if (rights === null || rights === ''){ // 没有权限树,移除当前节点 if(el.parentNode){ el.parentNode.removeChild(el); } return; } // 加载权限树 TreeNode.rightsTree = TreeNode.loadData(rights); } // 获取dom元素的id var elementId = el.id; if (elementId == undefined) { console.log("Format error! Without id property of the element with v-permissions:" + el); return; } // 获取上级节点的domkey //console.log(binding); var superDomkey = binding.value; var superNode = null; if(superDomkey != undefined && superDomkey != ""){ // 如果指定上级节点,先查找上级节点 superNode = TreeNode.lookupNodeByDomkey(TreeNode.rightsTree, superDomkey); if (superNode == null){ // 上级key未找到,设置错误 console.log("Wrong superDomkey value for element:" + el); // 忽略上级节点 } } // 设置搜索的根节点 var rootNode = null; if (superNode == null){ // 上级节点为空 rootNode = TreeNode.rightsTree; } else{ rootNode = superNode; } // 查找当前节点 var node = null; node = TreeNode.lookupNodeByDomkey(rootNode, elementId); if(node == null){ // 如果未在权限树中找到此节点,表示没有权限 // 移除此element对象 if(el.parentNode){ el.parentNode.removeChild(el); } } } export default { inserted(el,binding) { checkRights(el,binding) }, update(el,binding) { checkRights(el,binding) } }
2.2、注册该指令
在main.js中,注册该指令。main.js代码如下:
// The Vue build version to load with the `import` command // (runtime-only or standalone) has been set in webpack.base.conf with an alias. import Vue from 'vue' import App from './App' import router from './router' import store from './store' import ElementUI from 'element-ui' import 'element-ui/lib/theme-chalk/index.css' import md5 from 'js-md5'; import axios from 'axios' import VueAxios from 'vue-axios' import TreeNode_ from './common/treeNode.js' import CommonFuncs_ from './common/commonFuncs.js' import instance_ from './api/index.js' import global_ from './common/global.js' import permissions from './common/permissions.js' Vue.use(VueAxios,axios) Vue.prototype.$md5 = md5 Vue.prototype.TreeNode = TreeNode_ Vue.prototype.$baseUrl = process.env.API_ROOT Vue.prototype.instance = instance_ //axios实例 Vue.prototype.global = global_ Vue.prototype.commonFuncs = CommonFuncs_ Vue.use(ElementUI) Vue.config.productionTip = false // 注册一个全局自定义指令 v-permissions Vue.directive('permissions', permissions) /* eslint-disable no-new */ var vue = new Vue({ el: '#app', router, store, components: { App }, template: '<App/>', render:h=>h(App) }) export default vue
2.3、删除checkRights方法
在commonFuncs.js文件中,删除checkRights方法代码,因为不再调用此方法了。
原来在App.vue和其它vue文件中调用checkRights方法的代码,也删除。
2.4、模板文件示例
dom元素如果需要进行权限控制,则使用v-permissions指令,同时还要用id属性,匹配约定的domKey。这样就行了,无需编写其它javascript代码。
2.4.1、App.vue文件
App.vue文件,代码如下:
<template> <div id="app"> <!-- 其他页 --> <el-container style="min-height: calc(100% - 50px);" v-if="$route.meta.keepAlive"> <!-- 无头部导航栏 --> <el-container> <el-aside :style="{width:collpaseWidth}"> <!-- 侧边栏 --> <keep-alive> <left></left> </keep-alive> </el-aside> <el-main> <!-- Body --> <router-view></router-view> </el-main> </el-container> <!-- 无足部 --> </el-container> <!-- 登录页 --> <router-view v-if="!$route.meta.keepAlive"></router-view> </div> </template> <script> import left from './components/Left.vue' export default { name: 'App', components: { left: left }, data(){ return { collpaseWidth:200 } }, mounted:function(){ }, methods: { } } </script> <style> #app { font-family: 'Avenir', Helvetica, Arial, sans-serif; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-align: center; color: #2c3e50; margin-top: 20px; } .el-main { padding-top : 0px; } </style>
现在不需要任何权限控制的代码了。
2.4.2、Left.vue文件
侧边导航栏组件Left.vue文件,代码如下:
<template> <div class="left-sidebar"> <el-menu :default-openeds="['1']" style="background:#F0F6F6;"> <el-submenu index="1"> <el-menu-item-group > <el-menu-item index="1-1"> <router-link class="menu" tag="li" to="/home" exact-active-class="true" id="homeMenu" active-class="_active"> <i class="el-icon-s-home"></i>首页 </router-link> </el-menu-item> <el-submenu index="1-2" v-permissions id="userManagementMain"> <template slot="title" ><i class="el-icon-user-solid"></i>用户管理</template> <el-menu-item index="1-2-1" v-permissions id="userManagementSub"> <router-link class="menu" tag="li" to="/userManagement"> <i class="el-icon-user"></i>用户管理 </router-link> </el-menu-item> <el-menu-item index="1-2-2" v-permissions id="changePassword"> <router-link class="menu"tag="li" to="/changePassword"> <i class="el-icon-key"></i>修改密码 </router-link> </el-menu-item> </el-submenu> <el-menu-item index="1-3" v-permissions id="questionnaireManagement"> <router-link class="menu" tag="li" to="/questionnaireManagement"> <i class="el-icon-document"></i>问卷内容管理 </router-link> </el-menu-item> <el-submenu index="1-4" v-permissions id="issueManagementMain"> <template slot="title"><i class="el-icon-message"></i>问卷发布管理</template> <el-menu-item index="1-4-1" v-permissions id="issueManagementSub"> <router-link class="menu" tag="li" to="/issueManagement"> <i class="el-icon-phone"></i>发布问卷查询 </router-link> </el-menu-item> <el-menu-item index="1-4-2" v-permissions id="issueTaskQuery"> <router-link class="menu" tag="li" to="/issueTaskQuery"> <i class="el-icon-tickets"></i>发布任务查询 </router-link> </el-menu-item> </el-submenu> <el-menu-item index="1-5" v-permissions id="answerSheetManagement"> <router-link class="menu" tag="li" to="/answerSheetManagement"> <i class="el-icon-receiving"></i>答卷管理 </router-link> </el-menu-item> </el-menu-item-group> </el-submenu> </el-menu> </div> </template> <style> /* 去掉右边框 */ .el-menu { border-right: none; } .el-submenu { background-color: rgb(231, 235, 220) ; } </style>
注意,需要权限控制的dom元素,都有v-permissions,并且有id的值。
2.4.3、业务模块vue模板示例
业务模块vue模板示例,代码如下:
<template> <div id="contentwrapper"> <el-form ref="form" :model="formData" label-width="80px"> <el-card> <el-row> <!--占整行--> <el-col :span="24"> <h5 class="heading" align=left>用户管理 / 用户管理</h5> <!-- 分隔线 --> <el-divider></el-divider> </el-col> </el-row> <el-row> <el-col align="left" :span="6"> <el-button type="primary" v-permissions="'userManagementSub'" id="addUser" size="small" @click="addUser"> <i class="el-icon-circle-plus"></i>添加用户 </el-button> </el-col> <!-- 查询条件 --> <el-col align="left" :span="6"> <el-form-item label="用户类型:" label-width="100px"> <el-select v-model="formData.userTypeLabel" size="small" @change="selectUserType"> <el-option v-for="(item,index) in userTypeList" :key="index" :label="item.itemValue" :value="item" /> </el-select> </el-form-item> </el-col> <el-col :span="6"> <el-form-item label="用户状态:" label-width="100px"> <el-select v-model="formData.userStatusLabel" size="small" @change="selectUserStatus"> <el-option v-for="item in userStatusList" :key="item.itemKey" :label="item.itemValue" :value="item" /> </el-select> </el-form-item> </el-col> <el-col align="right" :span="6"> <el-button type="primary" v-permissions="'userManagementSub'" id="queryUser" size="small" @click="queryUsers"> <i class="el-icon-search"></i>查询 </el-button> </el-col> </el-row> <!-- 用户列表数据 --> <el-table :data="userInfoList" border stripe :row-style="{height:'30px'}" :cell-style="{padding:'0px','text-align':'center'}" style="font-size: 10px" :header-cell-style="{'text-align':'center'}"> <el-table-column label="用户ID" width="60px" prop="userId"></el-table-column> <el-table-column label="用户类型" width="100px" prop="userType"> <template slot-scope="scope"> <span v-if="userTypeMap.get(scope.row.userType) != null"> {{userTypeMap.get(scope.row.userType).itemValue}} </span> </template> </el-table-column> <el-table-column label="登录名" width="100px" prop="loginName"></el-table-column> <el-table-column label="真实名称" width="80px" prop="userName"></el-table-column> <el-table-column label="手机号码" width="100px" prop="phoneNumber"></el-table-column> <el-table-column label="EMail" prop="email" width="160px"></el-table-column> <el-table-column label="性别" width="60px" prop="gender"> <template slot-scope="scope"> <span v-if="genderMap.get(scope.row.gender) != null"> {{genderMap.get(scope.row.gender).itemValue}} </span> </template> </el-table-column> <el-table-column label="部门" width="100px" prop="deptId"> <template slot-scope="scope"> <span v-if="deptMap.get(scope.row.deptId) != null"> {{deptMap.get(scope.row.deptId).itemValue}} </span> </template> </el-table-column> <el-table-column label="状态" width="60px" prop="deleteFlag"> <template slot-scope="scope"> <span v-if="userStatusMap.get(scope.row.deleteFlag) != null"> {{userStatusMap.get(scope.row.deleteFlag).itemValue}} </span> </template> </el-table-column> <el-table-column label="角色" width="100px" prop="roles" :formatter="rolesFormatter"></el-table-column> <el-table-column label="操作"> <template slot-scope="scope"> <el-tooltip class="item" effect="dark" content="编辑" v-permissions="'userManagementSub'" id="editUser" placement="left-start"> <el-button size="mini" type="primary" icon="el-icon-edit" circle @click="editUser(scope.row)"></el-button> </el-tooltip> <el-tooltip class="item" effect="dark" content="禁用" v-permissions="'userManagementSub'" id="disableUser" placement="left-start" v-if="!scope.row.deleteFlag"> <el-button size="mini" type="primary" icon="el-icon-lock" circle @click="disableUser(scope.row)"></el-button> </el-tooltip> <el-tooltip class="item" effect="dark" content="启用" v-permissions="'userManagementSub'" id="enableUser" placement="left-start" v-if="scope.row.deleteFlag"> <el-button size="mini" type="primary" icon="el-icon-unlock" circle @click="enableUser(scope.row)"></el-button> </el-tooltip> </template> </el-table-column> </el-table> <!-- 分页区域 --> <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="formData.pageInfo.pagenum" :page-sizes="[5, 10, 15, 20]" :page-size="formData.pageInfo.pagesize" layout="total, sizes, prev, pager, next, jumper" :total="formData.pageInfo.total" background> </el-pagination> </el-card> </el-form> <!-- 新增、编辑 --> <add-or-edit-user v-if="editVisible" ref="addOrEditUser"></add-or-edit-user> </div> </template>
权限控制项,都设置了:v-permissions="'userManagementSub'",指明了上级节点的domkey为userManagementSub。无需其它javascipt调用控制代码。
还有,id="disableUser"和id="enableUser"的元素,都使用了v-if指令,现在也不会有可见属性的冲突。
2.5、方案总结
利用Vue的指令,使得权限控制表述更为简洁,无需其它javascript脚本,且解决了class被屏蔽的问题。另外,使用移除元素的方法,避免了与v-if的可见属性的冲突。
经测试,达到了权限控制的效果。
如果权限动态发生改变,只需刷新页面,将重构页面,无需担心移除的节点彻底消失。