Routing Management: useRouter Methods and Routing Middleware Applications

title: Route Management: UseRouter Methods and Routing Middleware Applications
date: 2024/7/28
updated: 2024/7/28
author: cmdragon

excerpt:
Abstract: This article describes the useRouter method in Nuxt 3 and its functionality in route management and middleware applications. It covers the use of useRouter to add and remove routes, get route information, History API based operations, navigation guard implementation such as defining anonymous, named and global middleware, and the use of navigateTo and abortNavigation helper functions. Promise and error handling are also covered, and finally an example demonstrates common usage of useRouter.

categories:

front-end development

tags:

routing management
useRouter
middleware
front-end development
web development

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I. Nuxt in the`useRouter` methodologies

useRouter is an important tool provided by Nuxt 3 for handling routing. It allows you to easily perform various routing operations in your application. For example, adding routes, navigation, route guards, etc.

II. Basic functions

addRoute(): Add a new route to the routing instance. You can provideparentName Adds the new route as a subroute of an existing route. Example:

const router = useRouter();
({ name: 'newRoute', path: '/newPath', component: NewComponent });

removeRoute(): Removes an existing route by name. Example:

('newRoute');

getRoutes(): Get a complete list of all routing records. Example:

const routes = ();

hasRoute(): Checks if a route with the given name exists. Example:

const hasRoute = ('newRoute');

resolve(): Returns a normalized version of the routing location with ahref attribute, which contains any existing base paths. Example:

const resolvedRoute = ({ name: 'newRoute' });

History API-based operations

back(): If possible, return to the previous page with(-1) Same. Example:

();

forward(): If possible, go forward to the next page with the(1) Same. Example:

();

go(): Moving forward or backward in the history is not subject to the() cap (a poem)() The hierarchical constraints imposed in the Example:

(3); // move forward 3 steps

push(): Programmatically navigate to a new URL by pushing the new entry into the history stack. it is recommended to use thenavigateTo Substitute. Example:

({ path: "/newUrl" });

replace(): Programmatically navigates to the new URL by replacing the current entry in the current route history stack. it is recommended to use thenavigateTo Substitute. Example:

({ hash: "#bio" });

IV. Navigation guards

Defining Middleware

Anonymous (or inline) middleware：
- Directly in the page'sdefinePageMeta defined in the method.
```
export default {
  pageMeta: {
    middleware: ['myMiddleware']
  }
}
```

naming middleware：

setmiddleware/ directory and automatically loaded in the page by asynchronous import.

// Create files in the `middleware/` directory
export default defineNuxtRouteMiddleware((to, from) => {
  // Middleware logic
})

global middleware：

setmiddleware/ directory with the.global Suffix ending.

// Create files in the `middleware/` directory
export default defineNuxtRouteMiddleware((to, from) => {
  // Global middleware logic
})

Using helper functions

Two globally available helper functions are provided to handle navigation:

navigateTo: Used to redirect to a given route.
```
return navigateTo('/new-route')
```
abortNavigation: Used to abort the current navigation.
```
return abortNavigation()
```

return value

The value returned by the middleware determines the behavior of the navigation:

not have: does not prevent navigation and will either proceed to the next middleware function (if any) or complete the route navigation.
navigateTo: Redirects to the given path and sets the redirect code to 302 Found or 301 Moved Permanently when a server-side redirect occurs.
abortNavigation: Stop the current navigation.
abortNavigation(error) : Rejects the current navigation and provides an error message.

typical example

Suppose we have a middleware for checking whether the user is logged in or not and redirecting to the login page if not:

export default defineNuxtRouteMiddleware((to, from) => {
  if (!userIsLoggedIn()) {
    return navigateTo('/login')
  }
})

caveat

Avoid infinite loops: check before redirecting is important, otherwise it may lead to an infinite redirection loop.
Using helper functions: Recommended usenavigateTo cap (a poem)abortNavigation helper functions to perform redirection or stop navigation to ensure integration and future compatibility.
Understanding Change Risks: AlthoughnavigateTo cap (a poem)abortNavigation The helper functions are recommended, but other return values described in the vue-router documentation may work as well. However, these return values may change in the future, so it's safest to use the officially recommended method.

V. Promise and Error Handling

isReady(): Returns aPromisethat resolves when the route completes its initial navigation. Example:

const ready = await ();

onError: Add an error handler that will be called every time an uncaught error occurs during navigation.

VI. Example applications

Below is a simple example of a Nuxt 3 application showing how to use theuseRouter Some of the common features of the

// pages/
<template>
  <div>
    <h1>Nuxt 3 Router Demo</h1>
    <button @click="addNewRoute">Add New Route</button>
    <button @click="removeRoute">Remove Route</button>
    <button @click="goToNewUrl">Go to New URL</button>
  </div>
</template>

<script setup>

const addNewRoute = () => {
  ({ name: 'newRoute', path: '/newPath', component: () => import('./') });
};

const removeRoute = () => {
  ('newRoute');
};

const goToNewUrl = () => {
  ({ path: '/newPath' });
};
</script>

For the rest of the article, please click to jump to the personal blog page or scan the code to follow or WeChat search:Programming Intelligence Front-End to Full-Stack Communication and Growth, read the full article: Route Management: The useRouter Method and Routing Middleware Applications | cmdragon's Blog

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