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Use addRouteMiddleware to dynamically add intermediate

Popularity:30 ℃/2024-08-04 10:37:10

title: Dynamically Adding Middleware with addRouteMiddleware
date: 2024/8/4
updated: 2024/8/4
author: cmdragon

excerpt:
Abstract: The article introduces the use of addRouteMiddleware in Nuxt3, which allows developers to dynamically add route middleware to realize specific operations such as permission checking, dynamic redirection and route changes. Covers the concept of routing middleware, syntax of addRouteMiddleware, parameters, usage examples (including anonymous middleware, named middleware, global middleware, and overriding existing middleware), and debugging tips. The flexibility and convenience that this feature brings to Nuxt3 applications is emphasized.

categories:

  • front-end development

tags:

  • Nuxt3
  • middleware
  • routing (in computer networks)
  • dynamic (science)
  • scope of one's jurisdiction
  • redirects
  • navigator

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In Nuxt3.addRouteMiddleware Allows developers to dynamically add routing middleware to their applications. This gives you the flexibility to perform navigation guards in different situations, such as handling permissions, redirects, and performing specific actions when routes change.

What is routing middleware?

Routing middleware is a function that performs certain actions before the user navigates to a specific route. It is commonly used for:

  • Checking user permissions
  • Dynamic redirection of users
  • Login or load data

In Nuxt3, all middleware is usually located in themiddleware/ directory, but by using theaddRouteMiddleware, you can add them dynamically at runtime.

addRouteMiddleware Syntax and Parameters

grammatical

addRouteMiddleware(name: string | RouteMiddleware, middleware?: RouteMiddleware, options: AddRouteMiddlewareOptions = {})

parameters

  • name: (string | RouteMiddleware)

    • can be a string (for naming middleware) or a routing middleware function of typeRouteMiddleware
  • middleware: (RouteMiddleware)

    • This is a function that takes two arguments:
      • to: Destination Route object containing information about the route the user is trying to access.
      • from: A source route object containing information about the route the user is currently on.
  • options: (AddRouteMiddlewareOptions)

    • An optional object to set additional options for the middleware. The options that can currently be set are:
      • global: (boolean) If set totrue, then the middleware is a global middleware, and the default is thefalse

utilizationaddRouteMiddleware

1. Anonymous routing middleware

Creating anonymous routing middleware comes in handy when you need simple logical processing.

Example: Blocking access to a specific page

// plugins/
export default defineNuxtPlugin(() => {
  addRouteMiddleware((to, from) => {
    // If the user tries to access the /forbidden path, block navigation
    if ( === '/forbidden') {
      ('Access blocked: user attempted to access a path that was never authorized:', );
      return false; // Block navigation
    }
  }).
}).

Explanation:

In the above example, if a user tries to access the/forbidden page, navigation will be blocked and logs will be output.

2. Naming routing middleware

Named routing middleware can be named with strings for easy subsequent calls and overrides.

Example: Record every navigation log

// plugins/
export default defineNuxtPlugin(() => {
  addRouteMiddleware('logger-middleware', (to, from) => {
    ('users from', , 'Navigate to', );
  });
});

Explanation:

In this example, we name the middlewarelogger-middleware. This middleware will output a log of the user's navigation at each navigation. This can be done via theaddRouteMiddleware way to override the middleware of the same name again.

3. Global routing middleware

Global middleware is executed on every route change and is suitable for scenarios where logic needs to be shared between each route.

Example: Global Access Control Check

// plugins/
export default defineNuxtPlugin(() => {
  addRouteMiddleware('auth-check', (to, from) => {
    const isAuthorized = false; // Assume this is your authentication logic.

    if (!isAuthorized) {
      ('The user is not authorized, redirecting to the login page'); }
      return navigateTo('/login'); // redirect to login page
    }
  }, { global: true }); }
}).

Explanation:

In this example, we create a global middlewareauth-check, each time a route change is made it is checked if the user is authorized. If the user is not authorized, the redirection to the/login Page.

4. Coverage of existing middleware

When using named middleware, the new middleware will overwrite the existing middleware with the same name. This is shown below:

// middleware/
export default defineNuxtRouteMiddleware((to, from) => {
  // Original logic
}).

// Then add the override to the plugins
// plugins/
export default defineNuxtPlugin(() => {
  addRouteMiddleware('auth', (to, from) => {
    ('Overrides the old auth middleware'); }
    // new logic
  });
});

In this example, theplugins/ The middleware in will override themiddleware/ in the content. Such a feature can help us modify the original logic under certain conditions.

Perform middleware debugging

Debugging middleware is an important step in the development process. It is possible to debug the middleware using a simple Output debugging information to help understand the execution flow of the middleware. Example:

// plugins/
export default defineNuxtPlugin(() => {
  addRouteMiddleware((to, from) => {
    ('[Middleware Debug]', 'From:', , 'To:', );
  });
});

This helps you to identify the execution order and path changes of the middleware.

summarize

By using theaddRouteMiddlewareYou have the flexibility to add, override and manage routing middleware in your Nuxt3 application. This provides the necessary tools to implement complex navigation logic, access control and data handling.

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:Dynamically Adding Middleware with addRouteMiddleware | cmdragon's Blog

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