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el-menu動態(tài)加載路由的實現(xiàn)

更新時間：2023年04月13日 15:44:16 作者：天外飛鮮橙子哥

本文主要介紹了el-menu動態(tài)加載路由的實現(xiàn)，文中通過示例代碼介紹的非常詳細(xì)，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

先看需要實現(xiàn)的效果

這里有一級也有二級菜單，注意二級菜單的父目錄（”選項設(shè)置“點擊不會跳轉(zhuǎn)，只是展開目錄），然后點擊去詳情頁，需要跳到一個隱藏的路由，不在菜單展示的路由

還有一點要注意，就是這里有兩個router-view，整個頁面是一個router-view，可以由LoginView和HomeView替換（當(dāng)前看到的頁面），而HomeView下又有一個router-view，需要用來展示部門，系統(tǒng)，超時，員工設(shè)置，不合格品列表和不合格品詳情頁。

以上的信息均需要在數(shù)據(jù)庫的表中體現(xiàn)

先看看直接寫在代碼里需要哪些操作

const routes = [
  {
    path: '',
    name: 'login',
    component: LoginView,
  }
  ,
  {
    component: HomeView,
    children: [
      {
        path: '/home',
        name: '不合格品列表',
        component: BelowStandard
      },
      {
        path: '/product/:id',
        name: '不合格品詳情',
        component: BelowStandardDetail
      }
    ]
  },
  {
    component: HomeView,
    name: '選項設(shè)置',
    children: [
      {
        path: '/employee',
        name: '員工設(shè)置',
        component: EmployeeConfig,
      },
      {
        path: '/department',
        name: '部門設(shè)置',
        component: DepartmentConfig
      },
      {
        path: '/system',
        name: '系統(tǒng)設(shè)置',
        component: SystemConfig
      },
      {
        path: '/warn',
        name: '超時提醒',
        component: WarmConfig
      }
    ]
  },
  {
    component: HomeView,
    children: [
      {
        path: '/statistics',
        name: '統(tǒng)計',
        component: DailyStatistics
      }
    ]
  },
  {
    component: HomeView,
    children: [
      {
        path: '/log',
        name: '日志管理',
        component: LogManager
      }
    ]
  },
]

這是路由，當(dāng)要動態(tài)從數(shù)據(jù)庫加載時，就不能寫在這

<el-menu
            router
            active-text-color="#ffd04b"
            background-color="#000"
            class="el-menu-vertical-demo"
            :default-active="this.$route.path"
            text-color="#fff"
            @open=""
            @close=""
        >
          <el-menu-item index="/home">
            <template #title>
              不合格品列表
            </template>
          </el-menu-item>
          <el-sub-menu index="/subMenuConfig">
            <template #title>
              選項設(shè)置
            </template>
            <el-menu-item index="/department">部門設(shè)置</el-menu-item>
            <el-menu-item index="/system">系統(tǒng)設(shè)置</el-menu-item>
            <el-menu-item index="/warn">超時設(shè)置</el-menu-item>
            <el-menu-item index="/employee">員工設(shè)置</el-menu-item>
          </el-sub-menu>
          <el-menu-item index="/statistics">
            <span>統(tǒng)計</span>
          </el-menu-item>
          <el-menu-item index="/log">
            <span>日志管理</span>
          </el-menu-item>
        </el-menu>

這是el-menu開啟了路由功能，所以能跳轉(zhuǎn)路由，當(dāng)動態(tài)加載的時候，這部分需要改造成v-for

數(shù)據(jù)庫

說明：parent_id為0的即是一級目錄，但是一級目錄里一部分可以直接展示界面，一部分是展開二級目錄，我這是以component字段為home/HomeView.vue來區(qū)分是展示二級目錄。

現(xiàn)在開始寫后端程序，返回菜單的json格式數(shù)據(jù)。

List<Menu> menuList = menuMapper.getMenuByUserId(UserUtils.getLoginUser().getId());
//根據(jù)ParentId分組
Map<Integer, List<Menu>> map = menuList.stream().collect(Collectors.groupingBy(Menu::getParentId, TreeMap::new,Collectors.toList()));
List<Menu> menus = map.get(0);//一級菜單
menus.forEach(menu->{//給有二級菜單的目錄設(shè)置children屬性
    List<Menu> children = map.get(menu.getId());
    menu.setChildren(children);
});
return menus;

從數(shù)據(jù)庫查詢到的數(shù)據(jù)格式如圖，然后分一級二級菜單處理后，再返回前端

[
{
"name": "不合格品列表",
"path": "/home",
"component": "product/BelowStandard.vue",
"orderNum": 1,
"parentId": 0,
"isHidden": false,
"children": null
},
{
"name": "選項設(shè)置",
"path": "/subMenuConfig",
"component": "home/HomeView.vue",
"orderNum": 2,
"parentId": 0,
"isHidden": false,
"children": [
				{
				"name": "員工設(shè)置",
				"path": "/employee",
				"component": "config/EmployeeConfig.vue",
				"orderNum": 1,
				"parentId": 2,
				"isHidden": false,
				"children": null
				},
				{
				"name": "部門設(shè)置",
				"path": "/department",
				"component": "config/DepartmentConfig.vue",
				"orderNum": 2,
				"parentId": 2,
				"isHidden": false,
				"children": null
				},
				{
				"name": "系統(tǒng)設(shè)置",
				"path": "/system",
				"component": "config/SystemConfig.vue",
				"orderNum": 3,
				"parentId": 2,
				"isHidden": false,
				"children": null
				},
				{
				"name": "超時提醒",
				"path": "/warn",
				"component": "config/WarmConfig.vue",
				"orderNum": 4,
				"parentId": 2,
				"isHidden": false,
				"children": null
				}
]
},
{
"name": "統(tǒng)計",
"path": "/statistics",
"component": "statistics/DailyStatistics.vue",
"orderNum": 3,
"parentId": 0,
"isHidden": false,
"children": null
},
{
"name": "日志管理",
"path": "/log",
"component": "log/LogManager.vue",
"orderNum": 4,
"parentId": 0,
"isHidden": false,
"children": null
},
{
"name": "不合格品詳情",
"path": "/product/:id",
"component": "product/BelowStandardDetail.vue",
"orderNum": 5,
"parentId": 0,
"isHidden": true,
"children": null
}
]

前端得到數(shù)據(jù)之后進(jìn)行處理，再添加到路由，過程中遇到一個問題，vue-router4版本去掉addRoutes換成addRoute帶來的問題困擾我很久

用Vue3就必須用Router4.x版本，由于4.0去掉了addRoutes 所以只能用addRoute

現(xiàn)在是只能添加一個

function routerPackag(routers:any) {
  if (routers) {
    routers.filter((itemRouter:any) => {
      if (itemRouter.component != "Layout") {
        router.addRoute('home',{ //home是父組件 add-route添加進(jìn)父組件chilren里
          path: `${itemRouter.path}`,
          name: itemRouter.name,
          meta: {
            title: itemRouter.name,
          },
          component: () => import(`../views/${itemRouter.component}`),
        })
      }
      if (itemRouter.children && itemRouter.children.length) {
        routerPackag(itemRouter.children)
      }
      return true
    })
  }
}

初始化路由：

router.beforeEach((to, from, next) => {//配置路由守衛(wèi)
    if(to.path==='/'){
        next()
    }else if(store.state.user.id){
        initMenus(router,store,next,to)
    }else{
        next({ path: '/',query: {redirect: to.path}});
    }
});

export const initMenus = (router, store,next,to) => {//按F5刷新的話vuex里的會被清空，長度變?yōu)?
    if (store.state.menu !== null) {
        next()
    }else {
        axios.get("/menu").then(response => {
            if (response) {
                let responseData = response.data
                if (responseData.flag) {
                    store.state.menu = responseData.data
                    initRoute(router,store.state)
                    next({...to,replace:true})//解決router4版本的第一次路由不匹配問題
                } else {
                    this.$ElMessage.error('請求菜單失敗')
                }
            }
        })
    }
}

const initRoute = (router,state)=> {
    const loadView = view => {//這種引入方式控制臺不會報警告
        // 路由懶加載
        return () => import(`@/views/${view}`)
    };
    const menus = state.menu
    const firstLevelMenu = {
        children: [],
        component: loadView('home/HomeView.vue')
    }
    menus.forEach(menu=>{
        menu.component = loadView(menu.component)
        if(menu.children === null || menu.children.length === 0){
            firstLevelMenu.children.push(menu)
        }else{
            menu.children.forEach(children=>{
                children.component = loadView(children.component)
            })
            router.addRoute(menu)
        }
    })
    router.addRoute(firstLevelMenu)
}

完成這些配置之后，路由就能動態(tài)加載了，然后取出vuex中存儲的menu生成el-menu

vuex中菜單大致如圖

<el-menu
    router
    active-text-color="#ffd04b"
    background-color="#000"
    class="el-menu-vertical-demo"
    :default-active="this.$route.path"
    text-color="#fff"
    @open=""
    @close=""
>
  <template v-for="route of this.$store.state.menu">
    <template v-if="route.children === null || route.children.length === 0"><!--一級菜單-->
      <template v-if="!route.isHidden">
        <el-menu-item :index = "route.path">
          <span>{{route.name}}</span>
        </el-menu-item>
      </template>
    </template>
    <template v-else><!--二級菜單-->
      <template v-if="!route.isHidden">
        <el-sub-menu :index = "route.path">
          <template #title>
            <span>{{route.name}}</span>
          </template>
          <template v-for="children of route.children">
            <template v-if="!children.isHidden">
              <el-menu-item :index = "children.path">
                <span>{{children.name}}</span>
              </el-menu-item>
            </template>
          </template>
        </el-sub-menu>
      </template>
    </template>
  </template>
</el-menu>

實現(xiàn)效果展示