How to implement the function of jumping to the page and returning to the previous page in nodejs-Front-end Q&A-php.cn

How to implement the function of jumping to the page and returning to the previous page in nodejs

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Release： 2023-04-06 10:41:37

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In web development, page jump is a very common operation, and the issue of page jump is also involved in Node.js web applications. This article will introduce how to implement the function of jumping to the page and returning to the previous page in Node.js.

What is page jump?

Page jump refers to the process of users moving from one page to another in a web application. Page jump is a very common operation, and most web applications need to jump between different pages.

There are two common page jump methods:

Client-side jump: Client-side jump refers to page jump in the browser. The implementation of this method requires the use of JavaScript in the page, usually by modifying the window.location object.
Server-side jump: Server-side jump refers to page jump on the server side. The implementation of this method requires response processing on the server side, and the page jump is implemented by sending a redirection response to the client.

Page jump in Node.js

Node.js is a very popular JavaScript runtime environment that helps developers build efficient web applications. In Node.js, there are two ways to implement page jump:

Use client-side jump: In Node.js, we can use some web development frameworks, such as Express.js, To implement client jump. Client-side redirection is usually implemented by specifying the redirection URL in the back-end code.
Use server-side jumps: Server-side jumps are also very common in Node.js. In Node.js, we can use the http and https modules to implement server-side jumps. Server-side jumps are usually implemented by sending 3xx status codes and Location header information.

How to implement the jump back to the previous page in Node.js

In web development, sometimes we need to implement the jump function back to the previous page. For example, after a user enters incorrect login information, we need to redirect the user to the login page while retaining the information entered by the user.

In Node.js, there are two ways to implement the jump function of returning to the previous page:

Use client jump: It is easier to implement using client jump The way. We can add some parameter information to the redirected URL of the page, such as the login information entered by the user, and then use JavaScript to obtain these parameter information on the next page, and then load it into the corresponding input box. This method is relatively simple to implement, but you need to pay attention to data security.
Use server-side jump: Using server-side jump is a safer way. We can save the login information entered by the user on the server side, and then use a server-side jump to redirect the user to the login page. When the user returns to the login page, the server can automatically fill in the corresponding input box based on the previously saved user login information.

The following is a sample code that uses server-side jump to return to the previous page:

const http = require('http');

const server = http.createServer((req, res) => {
  if (req.url === '/login') {
    // 处理用户登录请求
    // 保存用户输入的登录信息
    const username = req.query.username;
    const password = req.query.password;
    // 重定向到首页
    res.writeHead(302, {'Location': '/'});
    res.end();
  } else {
    // 处理首页请求
    // 返回登录页面，并填充之前保存的用户登录信息
    res.writeHead(200, {'Content-Type': 'text/html'});
    res.write(`<html><body><form action="/login" method="POST">
      <label for="username">Username:</label>
      <input type="text" name="username" value="${username || &#39;&#39;}">
      <br>
      <label for="password">Password:</label>
      <input type="password" name="password" value="${password || &#39;&#39;}">
      <br>
      <input type="submit" value="Submit">
      </form></body></html>`);
    res.end();
  }
});

server.listen(3000, () => console.log('Server is running on port 3000'));

Copy after login

In the above sample code, when the user accesses the login page, the server will return a A page containing a login form. When the user enters login information and submits the form, the server saves the login information entered by the user and redirects to the homepage. When a user visits the homepage, the server will return a page containing a login form and automatically fill in the previously saved user login information.

Summary

This article introduces two ways to implement page jumps in Node.js: client-side jumps and server-side jumps. At the same time, we also introduced how to implement the jump function back to the previous page in Node.js.

Whether it is a client-side jump or a server-side jump, you need to pay attention to the security of data when implementing page jumps to avoid data leakage and security vulnerabilities.

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