Extend the previous application code to make a calculator: the front end html has fields for 2 input numbers and the operations add, subtract, multiple, divide, and a field for the output. The back end server does the work, takes the input and sends back the result. Use CSS to make it look like a day at the Caribbean beach.
To extend the previous application code to create a calculator with a front-end HTML form for two input numbers and the operations add, subtract, multiply, divide, and a field for the output, follow these steps:
Set up the backend (app.js):
Update the backend to handle the calculation requests.
Create a public directory with HTML, CSS, and JavaScript files:
index.html: Main HTML file.
styles.css: CSS file for styling.
script.js: JavaScript file for handling interactions.
Here is the complete implementation:
Step 1: Backend (app.js)
javascript
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const express = require('express');
const bodyParser = require('body-parser');
const app = express();
const port = 3000;
// Middleware to serve static files and parse URL-encoded data from the form
Save the above files in their respective locations.
Ensure you have a public directory with the files index.html, styles.css, and script.js.
Start the Node.js server:
bash
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node app.js
Open your web browser and navigate to http://localhost:3000.
Explanation:
The backend (app.js) handles the calculation logic and serves static files.
The HTML file (index.html) provides a form with fields for two input numbers and a selection for the operation, along with a button to submit the form.
The CSS file (styles.css) styles the page to look like a day at the Caribbean beach.
The JavaScript file (script.js) handles the form submission, sends the data to the server, and updates the result on the page.
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