How to implement multi-level redirection in Vue Router

How to implement multi-level redirection in Vue Router requires specific code examples

Vue Router is the official routing manager of Vue.js, used to implement front-end Routing function. In actual projects, we often encounter situations that require multi-level redirection, that is, when a user accesses a route, he or she will automatically jump to another route based on conditions. This article will introduce how to implement multi-level redirection in Vue Router and give specific code examples.

Implementing multi-level redirection in Vue Router can be achieved by configuring the meta field of the route. The meta field is an object containing additional information. We can customize the fields in it to implement multi-level redirection.

First, we need to define a jump function to redirect based on conditions. Suppose the function we want to implement is to automatically jump to the login page when the user is not logged in; when the user is logged in but does not have permission to access a page, automatically jump to the unauthorized page.

// 跳转函数
function redirect(to) {
  if (!user.isAuthenticated) {
    // 没有登录，跳转到登录页
    return { path: '/login', query: { redirect: to.fullPath } }
  } else if (!user.hasPermission(to.meta.permission)) {
    // 没有权限，跳转到无权限页面
    return { path: '/unauthorized' }
  } else {
    // 有权限，继续访问原页面
    return { next: true }
  }
}

In the above code, user.isAuthenticated indicates whether the user is logged in, and user.hasPermission(permission) indicates whether the user has a certain permission.

Next, we need to use this jump function in the routing configuration. Suppose we have three routes: home page, login page, and no permission page.

// 路由配置
const routes = [
  {
    path: '/',
    name: 'home',
    component: Home,
    meta: {}
  },
  {
    path: '/login',
    name: 'login',
    component: Login,
    meta: {}
  },
  {
    path: '/unauthorized',
    name: 'unauthorized',
    component: Unauthorized,
    meta: {}
  }
]

Currently, the meta fields in our routing configuration are empty. We need to configure it according to the specific situation.

First, we need to configure the meta field of the homepage route to determine whether the user needs to log in.

// 路由配置
const routes = [
  {
    path: '/',
    name: 'home',
    component: Home,
    meta: { requiresAuth: true }
  },
  // ...
]

In the above code, we added a requiresAuth field to the meta field of the homepage, with a value of true, indicating that the user needs to log in to access the homepage.

Next, we need to configure the meta field of the route that requires permissions to determine whether the user has permissions.

// 路由配置
const routes = [
  {
    path: '/',
    name: 'home',
    component: Home,
    meta: { requiresAuth: true }
  },
  {
    path: '/admin',
    name: 'admin',
    component: Admin,
    meta: { requiresAuth: true, permission: 'admin' }
  },
  // ...
]

In the above code, we add a permission field to the meta field of the route that requires permission, and the value is the permission name (assume here that admin is the required permission).

Finally, we need to use the jump function in the beforeEach hook of the route to redirect based on the meta field.

// 路由配置
const router = new VueRouter({
  routes
})

// 全局路由守卫
router.beforeEach((to, from, next) => {
  const redirectTo = redirect(to)
  if (redirectTo.path) {
    // 跳转到指定页面
    next(redirectTo)
  } else {
    // 继续访问原页面
    next()
  }
})

In the above code, we use the jump function in the beforeEach hook to determine whether redirection is needed. If the jump function returns an object with a path field, it means that you need to redirect to the specified page; otherwise, it means that there is no redirection and you will continue to access the original page.

So far, we have completed the entire process of implementing multi-level redirection in Vue Router. Configure according to specific conditions to achieve automatic jump under different conditions.

To summarize, the steps to implement multi-level redirection in Vue Router are as follows:

1. Define a jump function to return the redirection path based on conditions.
2. Add custom fields in the meta field in the routing configuration for judgment.
3. Use the jump function in the beforeEach hook of the route to redirect based on the meta field.

The above is a specific code example of how to implement multi-level redirection in Vue Router. Hope this article can help you.

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