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App:redirected hooks in apps in detail

Popularity：528 ℃/2024-10-03 01:02:08

title: app:redirected hooks in apps in detail
date: 2024/10/3
updated: 2024/10/3
author: cmdragon

excerpt:
app:redirected is a hook in app:redirected that is used to handle redirections that occur during server-side rendering (SSR). This hook is called before the redirection is executed, allowing the developer to perform actions such as performing conditional checking, logging, etc. before the redirection occurs.

categories:

  • front-end development

tags:

  • redirects
  • SSR
  • hooks
  • accreditation
  • log (computing)
  • typical example

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app:redirected Yes is a hook for handling redirects that occur during server-side rendering (SSR). The hook is called before the redirection is executed, allowing the developer to perform a number of actions before the redirection occurs, such as performing conditional checking, logging, and so on.

catalogs

  1. summarize
  2. Definition of the app:redirected hook
  3. Call Timing and Context
    • 3.1 trigger cycle
    • 3.2 context parameter (computing)
  4. Examples of practical applications
    • 4.1 Example 1: Redirection Based on Authentication Status
    • 4.2 Example 2: Recording Redirect Logs
  5. caveat
  6. Frequently Asked Questions and Answers
  7. exercise question
  8. summarize

1. General

app:redirected The hook is triggered before the redirection request is initiated and rendered server-side. This hook captures all redirection logic, such as redirecting from one page to another.

2. Timing of the call

  • trigger cycle: When the server accepts the request and starts rendering the page, if a middleware or page's asyncData calls theredirect()
    method, then theapp:redirected。
  • underlying logic: This hook can help handle some of the logic before the redirection is executed, but the redirection will not actually be executed until this hook is executed.

3. Contextual parameters

The hook receives the following parameters:

  • to: Destination Route object representing the path the user wants to access.
  • from: A source routing object that represents the path the user is currently accessing.
  • next: function, which can be called to control whether the redirection continues or aborts (for example, a conditional check can be performed).

4. Examples of practical applications

Example 1: Redirection Based on Authentication Status

Here, we will redirect users based on their authentication status:

export default {
    setup(app) {
        ('app:redirected', (to, from, next) => {
            // Assuming there is a function to check if the user is logged in or not
            const isAuthenticated = checkUserAuthentication();

            if (!isAuthenticated && ! == '/login') {
                // If the user is not authenticated and is not accessing the login page, then redirect to the login page
                next({path: '/login'});
            } else {
                // Continue processing the redirect
                next();
            }
        }); }
    }
}; }

In this example, we first check if the user is logged in. If the user is not logged in and is trying to access a non-login page, redirect the user to the/login。

Example 2: Recording Redirect Logs

It is possible to log each redirection to a remote server:

export default {
    setup(app) {
        ('app:redirected', (to, from, next) => {
            // Record the redirection information
            (`Redirect: from ${} to ${}`); // Send the redirect message to the server asynchronously.
            // Send the redirected information to the server asynchronously.
            fetch('/redirect', {
                method: 'POST', body: ({from: , {from: ${} to ${}`)
                body: ({from: , to: }), { headers: {{from: , to: }), // send the redirect message asynchronously to the server
                headers: {
                    'Content-Type': 'application/json'
                }
            });
            // Continue redirection
            next(); // Continue redirecting.
        }); // Continue redirecting.
    }
}; }

In this example, we record the source and target of the redirect and send it to the log server.

5. Cautions

  • Ensure flexibility in redirection conditions:: Multiple scenarios should be considered in the redirection logic to ensure a good user experience.
  • Avoiding circular redirects: Ensure that redirection logic does not lead to loops (e.g., redirecting to the same page).
  • error handling: Handle any possible errors, such as failed network requests or illogical condition judgments.

6. Frequently asked questions and answers

  • Is the hook triggered on the client side?

    • app:redirected The hook is only triggered during server-side rendering.

  • How do I get a new state after a redirect?

    • New state information can be obtained by monitoring the state changes of the target route. After the redirection is complete, the application is re-rendered.

7. Exercise questions

  1. Modify the redirection logic so that it redirects to a different page based on the user role.
  2. Records each redirection to the database and ensures data integrity and security.
  3. Create a middleware that does some data preprocessing before redirection.

8. Summary

app:redirected Hooks provide developers with a powerful tool for handling redirection logic on the server side. Through the rational use of this hook , developers can perform conditional basis redirection , record redirection information and other operations , thereby enhancing the application management capabilities and user experience .

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: App:redirected hooks in apps explained | cmdragon's Blog

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