nodejs gets post jump page

In web development, there are many occasions when we need to submit form data through POST, and then jump to another page after performing corresponding processing in the background. When using Node.js as the backend, how to obtain the data of the POST request and process it accordingly?

This article will introduce how to use Node.js to obtain the POST jump page, mainly including the following content:

1. Understand the principles of POST requests and jump pages
2. Use Node.js to obtain POST request data
3. Process POST request data and jump to the specified page
4. Example demonstration

1. Understand POST requests and jumps The principle of the page

1. POST request

In the HTTP protocol, there are two common request methods, namely GET and POST. GET requests are used to request existing resources (such as viewing a picture), while POST requests are used to submit data to the server. These data are used to create or modify resources, such as submitting form data.

2. Jump page

In web applications, we often need to jump to different pages. Jumping to a page can be accomplished by setting the Location in the HTTP response header, for example:

HTTP/1.1 302 Found
Location: http://www.example.com/new-page.html

When the browser receives this response, it will automatically jump to the specified page.

2. Use Node.js to obtain POST request data

Node.js provides an HTTP module that can be used to create a web server. In order to obtain POST request data, the request event can be used. When the browser sends a request to the server, the server triggers the request event and passes the request object and response object to the corresponding callback function. The steps to obtain POST request data in the request event are as follows:

1. Create variables in the callback function to store the content of the post request

   let postData = '';

2. Listen to the data event, which will be triggered whenever request data is received.

   req.on('data', chunk => {
       postData += chunk.toString();
   });

   req points to the request object, where data represents the data contained in the request object, and chunk represents the received data block.

3. Listen to the end event, indicating that the data reception is completed

   req.on('end', () => {
       console.log(postData);
   });

   After the data reception is completed, postData can be processed accordingly.

3. Process the POST request data and jump to the specified page

After obtaining the POST request data, we need to perform corresponding processing and then jump to the specified page . The specific implementation steps are as follows:

1. Introduce the http and querystring modules of Node.js

   const http = require('http');
   const querystring = require('querystring');

2. Process POST request data in the request event

   req.on('data', chunk => {
       postData += chunk.toString();
   });
   
   req.on('end', () => {
       const data = querystring.parse(postData);
       // 相应的处理逻辑
   });

   After receiving the data, you can use the querystring module to convert postData into a JavaScript object for easy processing.

3. Response jump page

   res.writeHead(302, {
       Location: '/new-page.html'
   });
   res.end();

   Set the Location in the response header to the path of the page you want to jump to.

4. Example Demonstration

For the convenience of demonstration, a simple web server is simulated here using the http module of Node.js to process POST requests and jump. Go to a new page.

const http = require('http');
const querystring = require('querystring');

const server = http.createServer((req, res) => {
    if(req.method === 'POST') {
        let postData = '';
        req.on('data', chunk => {
            postData += chunk.toString();
        });

        req.on('end', () => {
            const data = querystring.parse(postData);
            console.log(data);

            // 响应跳转到新页面
            res.writeHead(302, {
                Location: '/new-page.html'
            });
            res.end();
        });
    } else {
        res.writeHead(200, {'Content-Type': 'text/html'});
        res.write(`
            <form method="post">
                <input type="text" name="name" value=""/>
                <input type="submit" value="Submit"/>
            </form>
        `);
        res.end();
    }
});

server.listen(8000);

After the server is started, by accessing http://localhost:8000, you can see a simple form page for submitting data. Then, after submitting the form data, it will jump to a new page.

Summary

Through the above steps, when using Node.js as the backend, you can easily obtain the POST request data and process and jump to the specified page accordingly. In practical applications, corresponding adaptations and improvements can be made according to specific needs.

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