el-menu动态加载路由的实现
先看需要实现的效果
这里有一级也有二级菜单，注意二级菜单的父目录（”选项设置“点击不会跳转，只是展开目录），然后点击去详情页，需要跳到一个隐藏的路由，不在菜单展示的路由
还有一点要注意，就是这里有两个router-view，整个页面是一个router-view，可以由LoginView和HomeView替换（当前看到的页面），而HomeView下又有一个router-view，需要用来展示部门，系统，超时，员工设置，不合格品列表和不合格品详情页。
以上的信息均需要在数据库的表中体现
先看看直接写在代码里需要哪些操作
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: '不合格品详情',
component: BelowStandardDetail
}
]
},
{
component: HomeView,
name: '选项设置',
children: [
{
path: '/employee',
name: '员工设置',
component: EmployeeConfig,
},
{
path: '/department',
name: '部门设置',
component: DepartmentConfig
},
{
path: '/system',
name: '系统设置',
component: SystemConfig
},
{
path: '/warn',
name: '超时提醒',
component: WarmConfig
}
]
},
{
component: HomeView,
children: [
{
path: '/statistics',
name: '统计',
component: DailyStatistics
}
]
},
{
component: HomeView,
children: [
{
path: '/log',
name: '日志管理',
component: LogManager
}
]
},
]
这是路由，当要动态从数据库加载时，就不能写在这
<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>
选项设置
</template>
<el-menu-item index="/department">部门设置</el-menu-item>
<el-menu-item index="/system">系统设置</el-menu-item>
<el-menu-item index="/warn">超时设置</el-menu-item>
<el-menu-item index="/employee">员工设置</el-menu-item>
</el-sub-menu>
<el-menu-item index="/statistics">
<span>统计</span>
</el-menu-item>
<el-menu-item index="/log">
<span>日志管理</span>
</el-menu-item>
</el-menu>
这是el-menu开启了路由功能，所以能跳转路由，当动态加载的时候，这部分需要改造成v-for
数据库
说明：parent_id为0的即是一级目录，但是一级目录里一部分可以直接展示界面，一部分是展开二级目录，我这是以component字段为home/HomeView.vue来区分是展示二级目录。
现在开始写后端程序，返回菜单的json格式数据。
List<Menu> menuList = menuMapper.getMenuByUserId(UserUtils.getLoginUser().getId());
//根据ParentId分组
Map<Integer, List<Menu>> map = menuList.stream().collect(Collectors.groupingBy(Menu::getParentId, TreeMap::new,Collectors.toList()));
List<Menu> menus = map.get(0);//一级菜单
menus.forEach(menu->{//给有二级菜单的目录设置children属性
List<Menu> children = map.get(menu.getId());
menu.setChildren(children);
});
return menus;
从数据库查询到的数据格式如图，然后分一级二级菜单处理后，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": "选项设置",
"path": "/subMenuConfig",
"component": "home/HomeView.vue",
"orderNum": 2,
"parentId": 0,
"isHidden": false,
"children": [
{
"name": "员工设置",
"path": "/employee",
"component": "config/EmployeeConfig.vue",
"orderNum": 1,
"parentId": 2,
"isHidden": false,
"children": null
},
{
"name": "部门设置",
"path": "/department",
"component": "config/DepartmentConfig.vue",
"orderNum": 2,
"parentId": 2,
"isHidden": false,
"children": null
},
{
"name": "系统设置",
"path": "/system",
"component": "config/SystemConfig.vue",
"orderNum": 3,
"parentId": 2,
"isHidden": false,
"children": null
},
{
"name": "超时提醒",
"path": "/warn",
"component": "config/WarmConfig.vue",
"orderNum": 4,
"parentId": 2,
"isHidden": false,
"children": null
}
]
},
{
"name": "统计",
"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": "不合格品详情",
"path": "/product/:id",
"component": "product/BelowStandardDetail.vue",
"orderNum": 5,
"parentId": 0,
"isHidden": true,
"children": null
}
]
前端得到数据之后进行处理，再添加到路由，过程中遇到一个问题，vue-router4版本去掉addRoutes换成addRoute带来的问题困扰我很久
用Vue3就必须用Router4.x版本，由于4.0去掉了addRoutes 所以只能用addRoute
现在是只能添加一个
function routerPackag(routers:any) {
if (routers) {
routers.filter((itemRouter:any) => {
if (itemRouter.component != "Layout") {
router.addRoute('home',{ //home是父组件 add-route添加进父组件chilren里
path: `${itemRouter.path}`,
name: itemRouter.name,
meta: {
title: itemRouter.name,
},
component: () => import(`../views/${itemRouter.component}`),
})
}
if (itemRouter.children && itemRouter.children.length) {
routerPackag(itemRouter.children)
}
return true
})
}
}
初始化路由：
router.beforeEach((to, from, next) => {//配置路由守卫
if(to.path==='/'){
next()
}else if(store.state.user.id){
initMenus(router,store,next,to)
}else{
next({ path: '/',query: {redirect: to.path}});
}
});
export const initMenus = (router, store,next,to) => {//按F5刷新的话vuex里的会被清空，长度变为0
if (store.state.menu !== null) {
next()
}else {
axios.get("/menu").then(response => {
if (response) {
let responseData = response.data
if (responseData.flag) {
store.state.menu = responseData.data
initRoute(router,store.state)
next({...to,replace:true})//解决router4版本的第一次路由不匹配问题
} else {
this.$ElMessage.error('请求菜单失败')
}
}
})
}
}
const initRoute = (router,state)=> {
const loadView = view => {//这种引入方式控制台不会报警告
// 路由懒加载
return () => import(`@/views/${view}`)
};
const menus = state.menu
const firstLevelMenu = {
children: [],
component: loadView('home/HomeView.vue')
}
menus.forEach(menu=>{
menu.component = loadView(menu.component)
if(menu.children === null || menu.children.length === 0){
firstLevelMenu.children.push(menu)
}else{
menu.children.forEach(children=>{
children.component = loadView(children.component)
})
router.addRoute(menu)
}
})
router.addRoute(firstLevelMenu)
}
完成这些配置之后，路由就能动态加载了，然后取出vuex中存储的menu生成el-menu
vuex中菜单大致如图
<el-menu
router
active-text-color="#ffd04b"
background-color="#000"
class="el-menu-vertical-demo"
:default-active="this.$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"><!--一级菜单-->
<template v-if="!route.isHidden">
<el-menu-item :index = "route.path">
<span>{{route.name}}</span>
</el-menu-item>
</template>
</template>
<template v-else><!--二级菜单-->
<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>
实现效果展示
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