vue3+Element采用递归调用封装导航栏实现

目录

• 效果预览
• 模拟数据
• 父组件aside.vue 
• 子组件subAside.vue
• 配置

效果预览

模拟数据

• 数据来源有很多，可以是自己写死的，也可以是后端调用得到的，也可以从别的组件中拿到
• 这里采用从路由中拿
• 定义数据源src/router/module.js/

const Login = () => import('../views/Login/Login.vue');
const Layout = () => import('../layout/layout.vue');
const Home = () => import('../views/Home.vue');
const User = () => import('../views/About.vue');
const Avatar = () => import('../views/Users/Avatar.vue');
const Password = () => import('../views/Users/Password.vue');

const routes = [
  {
    path: '/',
    redirect: '/home',
  },
  {
    path: '/',
    name: 'Layout',
    component: Layout,
    meta: {
      permission: true,
    },
    children: [
      {
        path: '/home',
        name: 'Home',
        component: Home,
        meta: {
          title: '首页',
          icon: '<span class="iconfont icon-shouye"/>', // iconfont图标
          inSide: true,
        },
      },
      {
        path: '/user',
        name: 'User',
        component: User,
        meta: {
          title: '个人中心',
          icon: '<span class="iconfont icon-yonghuzhongxin1"/>',
        },
        children: [
          {
            path: '/user/avatar',
            name: 'Avatar',
            component: Avatar,
            meta: {
              title: '修改头像',
            },
            children: [
              {
                path: '/setUp/avatar',
                name: 'setUp',
                component: Avatar,
                meta: {
                  title: '暂无',
                },
              },
            ],
          },
          {
            path: '/user/password',
            name: 'Password',
            component: Password,
            meta: {
              title: '修改密码',
            },
          },
        ],
      },
      {
        path: '/setUp',
        name: 'SetUp',
        meta: {
          title: '系统设置',
          icon: '<span class="iconfont icon-celveguanli"/>',
        },
        children: [
          {
            path: '/setUp/avatar',
            name: 'setUp',
            component: Avatar,
            meta: {
              title: '暂无',
            },
          },
          {
            path: '/setUp/avatar',
            name: 'setUp',
            component: Avatar,
            meta: {
              title: '暂无',
            },
          },
        ],
      },
    ],
  },

  {
    path: '/login',
    name: 'Login',
    component: Login,
  },
];
export default routes;

递归实现导航栏渲染

• 对于导航栏渲染难点在于不知道有多少层级的导航，可能一级也可能两级或者更多
• 为了方便采用两个组件父组件aside.vue与子组件subAside.vue渲染导航
• 这时候就需要采用递归的方式
  • 首先判断哪些数据需要渲染，需要的拿出来
  • 判断是否有子节点需要渲染
    • 有子节点，递归调用子组件本身
    • 没有子节点，返回导航项进行渲染

父组件aside.vue 

<template>
  <el-radio-group v-model="isCollapse" style="margin-bottom: 20px">
    <el-radio-button :label="false">expand</el-radio-button>
    <el-radio-button :label="true">collapse</el-radio-button>
  </el-radio-group>
  <el-menu
      default-active="2"
      class="el-menu-vertical-demo"
      :collapse="isCollapse"
      select="handleSelect"
      router
      unique-opened
  >
    <!-- 将渲染导航每一项传给子组件渲染，item代表要渲染每一项 -->
    <SubAside :isCollapse="isCollapse" v-for="(item,index) in navs" :key="item.path" :menu="item" :index="item.path" />
  </el-menu>

</template>

<script lang="ts" setup>
import { ref } from 'vue';
import router from '../router/module';
const navs =router.filter((item) => item.meta?.permission)[0].children // 过滤拿到数据
console.log(navs);

const isCollapse = ref(true); // 是否收起，默认不收起

</script>

<style lang="scss" scoped></style>

父组件处理后的用于渲染的数据

[
	{
		component: () => import('/src/views/Home.vue')
		meta: {title: '首页', icon: '<span class="iconfont icon-shouye"/>', inSide: true}
		name: "Home"
		path: "/home"
	},
	{
		component: () => import('/src/views/About.vue')
		meta: {title: '个人中心', icon: '<span class="iconfont icon-yonghuzhongxin1"/>'}
		name: "User"
		path: "/user"
		chilren:[
		{
			children: [{…}]
			component: () => import('/src/views/Users/Avatar.vue?t=1655544364909')
			meta: {title: '修改头像'}
			name: "Avatar"
			path: "/user/avatar"
		},
		{
			component: () => import('/src/views/Users/Password.vue')
			meta: {title: '修改密码'}
			name: "Password"
			path: "/user/password"
		}
		]
	},
	{
		meta: {title: '系统设置', icon: '<span class="iconfont icon-celveguanli"/>'}
		name: "SetUp"
		path: "/setUp"
		chilren:[
		{
			component: () => import('/src/views/Users/Avatar.vue?t=1655544364909')
			meta: {title: '暂无'}
			name: "setUp"
			path: "/setUp/avatar"
		},
		{
			component: () => import('/src/views/Users/Avatar.vue?t=1655544364909')
			meta: {title: '暂无'}
			name: "setUp"
			path: "/setUp/avatar"
		}
		]
	}
]

子组件subAside.vue

<template>
    <!-- 有子节点渲染这个 -->
    <el-sub-menu :index="menu.path" v-if="menu?.children">
        <template #title>
            <el-icon v-html="menu?.meta.icon"></el-icon>
            <span>{{menu?.meta.title}}</span>
        </template>
        <!-- 递归调用本身，该组件在index.ts中全局注册了 -->
        <SubAside v-for="item in menu.children" :menu="item" :isCollapse="isCollapse"/>
    </el-sub-menu>
    <!-- 没有子节点渲染这个 -->
    <el-menu-item  v-else  :index="menu?.path">
            <el-icon v-html="menu?.meta.icon"></el-icon>
            <span slot="title">{{menu?.meta.title}}</span>
    </el-menu-item >
  
</template>
   
<script lang="ts" setup>
import { ref } from "vue"
// 拿到父组件传入的值
defineProps({
  isCollapse:Boolean,
  menu:Object
})


</script>

<style lang="scss" scoped>

</style>

配置

版本

"vue": "^3.2.25",
 "element-plus": "^2.2.6",

main.ts中配置

import { createApp } from 'vue';
import App from './App.vue';
// import 'virtual:windi.css';
import router from './router/index';
/**
 * 引入elment
 */
 import ElementPlus from 'element-plus'
 import 'element-plus/dist/index.css'
 import 'element-plus/theme-chalk/dark/css-vars.css'
 import './styles/dark/css-vars.css'


// 引入 Pinia 状态管理工具
import pinia from './stores'

const app=createApp(App)
 /**
  * 全局注册组件
  */
import SubAside from './components/subAside.vue'
app.component('SubAside', SubAside)


// 注册Element全局可用
app.use(ElementPlus).use(router).use(pinia).mount('#app');