Program-2

React (BCSL657B)

2. Develop a React application that demonstrates the use of props

Develop a React application that demonstrates the use of props to pass data from a parent component to child components. The application should include the parent component named App that serves as the central container for the application. Create two separate child components, Header: Displays the application title or heading. Footer: Displays additional information, such as copyright details or a tagline. Pass data (e.g., title, tagline, or copyright information) from the App component to the Header and Footer components using props. Ensure that the content displayed in the Header and Footer components is dynamically updated based on the data received from the parent component.

Step 1: Create a New React Application

First, you need to create a new React app using below command. Open your terminal and run:

npx create-react-app my-app

This will set up a new React project in a folder called react-props-demo. After the installation is complete, navigate to the project directory:

cd my-app

Step 2: Define the Components

1. App Component (Parent Component)

In src/App.js, we define the parent component App, which will pass data to the child components using props.

import React from 'react';
import Header from './Header';
import Footer from './Footer';
import './App.css';

function App() {
  const title = "Welcome to My React App";
  const tagline = "Building great apps with React";
  const copyright = "© 2025 MyApp, All Rights Reserved";

  return (
    <div className="App">
      <Header title={title} />
      <Footer tagline={tagline} copyright={copyright} />
    </div>
  );
}

export default App;

2. Header Component (Child Component)

Create a new file src/Header.js for the Header component, which will receive the title as a prop.

import React from 'react';

function Header(props) {
  return (
    <header>
      <h1>{props.title}</h1>
    </header>
  );
}

export default Header;

3. Footer Component (Child Component)

Create a new file src/Footer.js for the Footer component, which will receive the tagline and copyright as props.

import React from 'react';

function Footer(props) {
  return (
    <footer>
      <p>{props.tagline}</p>
      <p>{props.copyright}</p>
    </footer>
  );
}

export default Footer;

Step 3: Add Some Basic Styles (Optional)

To make the app look better, you can add some basic styles. Open src/App.css (or create a new file) and add the following styles:

.App {
  text-align: center;
  font-family: Arial, sans-serif;
}

header {
  background-color: #282c34;
  padding: 20px;
  color: white;
}

footer {
  background-color: #282c34;
  padding: 10px;
  color: white;
  position: absolute;
  bottom: 0;
  width: 100%;
  text-align: center;
}

Step 4: Run the application

Back in your terminal, start the development server by running:

npm start

---

Getting Started with Create React App

This project was bootstrapped with Create React App.

Available Scripts

In the project directory, you can run:

npm start

Runs the app in the development mode.
Open http://localhost:3000 to view it in your browser.

The page will reload when you make changes.
You may also see any lint errors in the console.

npm test

Launches the test runner in the interactive watch mode.
See the section about running tests for more information.

npm run build

Builds the app for production to the build folder.
It correctly bundles React in production mode and optimizes the build for the best performance.

The build is minified and the filenames include the hashes.
Your app is ready to be deployed!

See the section about deployment for more information.

npm run eject

Note: this is a one-way operation. Once you eject, you can't go back!

If you aren't satisfied with the build tool and configuration choices, you can eject at any time. This command will remove the single build dependency from your project.

Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except eject will still work, but they will point to the copied scripts so you can tweak them. At this point you're on your own.

You don't have to ever use eject. The curated feature set is suitable for small and middle deployments, and you shouldn't feel obligated to use this feature. However we understand that this tool wouldn't be useful if you couldn't customize it when you are ready for it.

Learn More

You can learn more in the Create React App documentation.

To learn React, check out the React documentation.

Code Splitting

This section has moved here: https://facebook.github.io/create-react-app/docs/code-splitting

Analyzing the Bundle Size

This section has moved here: https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size

Making a Progressive Web App

This section has moved here: https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app

Advanced Configuration

This section has moved here: https://facebook.github.io/create-react-app/docs/advanced-configuration

Deployment

This section has moved here: https://facebook.github.io/create-react-app/docs/deployment

npm run build fails to minify

This section has moved here: https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify