Integrating Frontend Javascript with Backend Node.Js and mySQL

user_18902550 0
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I have tried searching around, but could not really find a solution to my question. Either that or I am not really understanding something properly.

I have a page with a simple form that uses Javascript to alert the user of their inputs upon clicking the submit button. I've also created a Node.Js function to insert input into a mySQL database. What I am unsure of is if I am able to link the above together without using a framework like Express Js.

My codes as follows:

index.php

<!doctype html>
<html>
<head>
  <title>homework</title>
  <link href="../css/style.css" rel="stylesheet" type="text/css"/>
  <script src="../js/form.js"></script>
</head>
<body>
  <div class="container">
    <h1>This is a header</h1>
    <div class="card input-form">
      <p>Enter your details below.</p>
      <label for="inputFirstName">First Name</label>
      <input id="inputFirstName" type="text" name="inputFirstName" required /><br><br>
      <label for="inputLastName">Last Name</label>
      <input id="inputLastName" type="text" name="inputLastName" required /><br><br>
      <button id="btnSubmit" onclick="submitDetails();">Submit</button>
    </div>
  </div>

</body>
</html>

form.js

let firstName, lastName, response;

function submitDetails() {
  firstName = document.getElementById("inputFirstName").value;
  lastName = document.getElementById("inputLastName").value;

  response = confirm(`Please verify the submitted details.

First Name: ${firstName}
Last Name: ${lastName}`);

  if (response == true) {
    alert("Personal details submitted.");
  } else {
    alert("You have cancelled your submission.");
  }
}

app.js

const mysql = require("mysql");
const config = require("./config.js");
// console.log(config);
const connection = mysql.createConnection(config);

connection.connect((err) => {
  if (!err) {
    console.log("Connected to mySQL Database");
  } else {
    console.log("Connection Failed");
  }
});

const newTable = `CREATE TABLE IF NOT EXISTS details (
                  id int primary key auto_increment,
                  firstName varchar(50) NOT NULL,
                  lastName varchar(50) NOT NULL
                )`;

connection.query(newTable, function (err, results, fields) {
  // console.log(results);
});

module.exports = connection;

let firstName, lastName;

function insertEntry(firstName, lastName) {
  firstName = "John";
  lastName = "Doe";

  let newEntry = `INSERT INTO details (firstName, lastName)
                  VALUES ('${firstName}', '${lastName}')`;

  connection.query(newEntry, function (err, results, fields) {
    // console.log(results);
    if (!err) {
      console.log("Entry inserted into table");
    }
  });
}

insertEntry();

connection.end(function () {
  console.log("Connection Terminated");
});

config.js

let config = {
  host: "127.0.0.1",
  user: "test",
  password: "password",
  database: "homework",
};

module.exports = config;

My Folder Tree is as such:

homework
|--views
| |--index.php
|
|--js
| |--app.js
| |--config.js
| |--form.js
|
|--css
  |--style.css

======================================================

Update using Fedex7501's answer:

app.js

var http = require("http");
var fs = require("fs");
http
  .createServer(function (req, res) {
    if (req.method === "POST") {
      let body = "";
      req.on("data", (chunk) => {
        body += chunk.toString();
      });
      req.on("end", () => {
        body = JSON.parse(body);
        insertEntry(body.firstName, body.lastName);

        // res.end("ok");
      });
      // } else {
      //   res.end();
    }
    fs.readFile("../views/index.php", function (err, data) {
      res.writeHead(200, { "Content-Type": "text/html" });
      res.write(data);
      return res.end();
    });
  })
  .listen(8000);

const mysql = require("mysql");
const config = require("./config.js");

const connection = mysql.createConnection(config);

connection.connect((err) => {
  if (!err) {
    console.log("Connected to mySQL Database");
  } else {
    console.log("Connection Failed");
  }
});

const newTable = `CREATE TABLE IF NOT EXISTS details (
                    id int primary key auto_increment,
                    firstName varchar(50) NOT NULL,
                    lastName varchar(50) NOT NULL
                  )`;

connection.query(newTable, function (err, results, fields) {
  // console.log(results);
});

let firstName, lastName;

function insertEntry(firstName, lastName) {
  // firstName = "John";
  // lastName = "Doe";

  let newEntry = `INSERT INTO details (firstName, lastName)
                  VALUES ('${firstName}', '${lastName}')`;

  connection.query(newEntry, function (err, results, fields) {
    // console.log(results);
    if (!err) {
      console.log("Entry inserted into table");
    }
  });
}

// insertEntry();
node.js mysql javascript
1 Answers

You can use the http module on the server like this:

const http = require('http');

const server = http.createServer((req, res) => {
    if (req.method === 'POST') {
        //Notice we aren't handling routes here

        let body = '';
        req.on('data', chunk => {
            body += chunk.toString();
        });
        req.on('end', () => {
            //Finished receiving data

            body = JSON.parse(body)
            insertEntry(body.firstName, body.lastName)

            res.end('ok');
        });
    }
    else {
        if (req.url === '/'){
            //Serve index file
            fs.readFile("../views/index.php", function (err, data) {
                res.writeHead(200, { "Content-Type": "text/html" });
                res.write(data);
                return res.end();
            });
        } else {
            //Serve static content
            
            //This is dangerous because it allows reading any file like app.js
            //Note: remove the .. in the src and href in the php file, it looks cleaner this way
            fs.readFile('../' + req.url, (err, data) => {
                if (err){
                    res.statusCode = 404;
                    res.end('File not found');
                } else {
                    //Here we should parse the file name to determine the content type
                    //I'll leave that as an exercise to the reader
                    //Hint: https://stackoverflow.com/a/11972512/8891434

                    //res.setHeader('Content-Type', 'text/javascript')
                    
                    res.end(data)
                }
            })
        }
        res.end();
    }
});

server.listen(80);

And on the client I prefer to use the axios library

Add this inside the <head> to import it

<script src="https://unpkg.com/axios/dist/axios.min.js"></script>

And then you can send the data like this:

let firstName, lastName, response;

function submitDetails() {
  firstName = document.getElementById("inputFirstName").value;
  lastName = document.getElementById("inputLastName").value;

  response = confirm(`Please verify the submitted details.

  First Name: ${firstName}
  Last Name: ${lastName}`);

  if (response == true) {
    //Send data
    axios.post('your_backend_ip', {firstName: firstName, lastName: lastName}).then(() => {
       alert("Personal details submitted.");
    })
  } else {
    alert("You have cancelled your submission.");
  }
}

Of course, this is a very simple example since we don't handle multiple routes. I would recommend learning how to use the Express framework, it's easy to use and much more powerful than the http module.

user_88914340
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