NEXT.JS

NEXT.JS
Next.js is a flexible React framework that gives you building blocks to
create fast web applications.
1
Binumon Joseph, Assistant Professor

MASTERI
NG SERVER-SI
DE
RENDERI
NG WI
TH NEXT.JS:
A COMPREHENSIVE
TUTORIAL
Binumon Joseph, Assistant Professor 2

INTRODUCTION
Server-Side Rendering (SSR)is
a technique that allows your
web application to pre-render
HTML on a server,providing
faster load times and a better
user experience.In this tutorial,
we'll cover Next.js,a framework
for building server-rendered
React applications.

WhyUseSSR?
SSR can improve SEO,performance,
and user experience. It allows search
engines to better crawl your site,
reduces the time to ﬁrst paint,and
provides users with a fully rendered
page on the initial load. Next.js
simpliﬁes the process of building
SSR applications.

GETTINGSTARTEDWITHNEXT.JS
To get started with Next.js,you'll
need to install it and create a
new project.Next.js provides
several built-in features,such as
dynamic imports,automatic
code splitting,and server-side
rendering.You can also easily
add custom routes and API
endpoints.

T
o build pages with Next.js,you'll
create a pages directory and add
React components for each page.
Next.js uses getI
nitialProps to
fetch data and render the page on
the server.You can also use
dynamic routing and static site
generation to optimize
performance.
BUILDINGPAGESWITHNEXT.JS

Deploying
Your
Next.js
App
Next.js makes it easy to deploy
your app to Vercel,a cloud
platform for static and serverless
sites.Vercel provides automatic
SSL,custom domains,and
global CDN.You can also deploy
to other platforms such as
Heroku or AWS.
DeployingYourNext.jsApp

Next.js provides a powerful framework for building
server-rendered React applications. By using SSR,
you can improve SEO, performance, and user
experience. With Next.js, you can easily create
dynamic routes, API endpoints, and deploy your app
to the cloud. Keep learning and building!
CONCLUSION

Building Blocks of a Web Application
• User Interface - how users will consume and interact with your application.
• Routing - how users navigate between different parts of your application.
• Data Fetching - where your data lives and how to get it.
• Rendering - when and where you render static or dynamic content.
• Integrations - what third-party services you use (CMS, auth, payments, etc) and how
you connect to them.
• Infrastructure - where you deploy, store, and run your application code (Serverless,
CDN, Edge, etc).
• Performance - how to optimize your application for end-users.
• Scalability - how your application adapts as your team, data, and traffic grow.
• Developer Experience - your team’s experience building and maintaining your
application. 9

React ?
Interactive User Interface
• JavaScript library for building
interactive user interfaces.
• User interfaces, - Elements that
users see and interact with on-
screen.
• Library - React provides helpful
functions to build UI, but leaves it up
to the developer where to use those
functions in their application.
10
Binumon Joseph, Assistant
Professor

Next.js?
• React framework that gives you building blocks to create web
applications.
• Framework - Next.js handles the tooling and configuration needed
for React, and provides additional structure, features, and
optimizations for your application.
11

From JavaScript to React
12

Rendering User Interfaces
13

DOM vs UI
14

UI update with
JavaScript
• Create new file index.html
<html>
<body>
<div id="app"></div>
<script type="text/javascript">
// Select the div element with 'app' id
const app = document.getElementById('app');
// Create a new H1 element
const header = document.createElement('h1');
// Create a new text node for the H1 element
const headerContent = document.createTextNode(
'Develop. Preview. Ship.',
);
// Append the text to the H1 element
header.appendChild(headerContent);
// Place the H1 element inside the div
app.appendChild(header);
</script>
</body>
</html>
15
Binumon Joseph, Assistant
Professor

Imperative vs Declarative Programming
• Imperative programming is like giving a chef step-by-step instructions
on how to make a pizza.
• Declarative programming is like ordering a pizza without being
concerned about the steps it takes to make the pizza.
• React is a Declarative Library
16

Imperative vs Declarative Programming
• Imperative programming is like giving a chef step-by-step instructions
on how to make a pizza.
• Declarative programming is like ordering a pizza without being
concerned about the steps it takes to make the pizza.
• React is a Declarative Library
17

Getting Started
with React
• To use React in your project,
you can load two React scripts
from an external website
called unpkg.com:
• react is the core React library.
• react-dom provides DOM-
specific methods that enable
you to use React with the DOM.

<html>
<body>
<script
src="https://unpkg.com/react@17/umd/react.dev
elopment.js"></script>
<script src="https://unpkg.com/react-
dom@17/umd/react-
dom.development.js"></script>
</script>
</body>
</html>
18

Rendering React
• Instead of directly manipulating
the DOM with plain JavaScript,
you can use the
ReactDOM.render() method
from react-dom to tell React to
render our <h1> title inside our
#app element.

<html>
<body>
<script
src="https://unpkg.com/react@17/umd/react.dev
elopment.js"></script>
dom@17/umd/react-
ReactDOM.render(<h1>Develop. Preview. Ship.
</h1>, app);
</script>
</body>
</html>
19

JSX- JavaScript
Syntax Extension
• JSX is a syntax extension for JavaScript
that allows you to describe your UI in a
familiar HTML-like syntax.
• The nice thing about JSX is that apart from
following three JSX rules, you don’t need
to learn any new symbols or syntax outside
of HTML and JavaScript.
• Note that browsers don’t understand JSX
out of the box, so you’ll need a JavaScript
compiler, such as a Babel, to transform
your JSX code into regular JavaScript.
<html>
<body>
<script
src="https://unpkg.com/react@17/umd/react.developm
ent.js"></script>
dom@17/umd/react-dom.development.js"></script>

<script
src="https://unpkg.com/@babel/standalone/babel.min.j
s"></script>
<script type="text/jsx">
ReactDOM.render(<h1>Develop. Preview. Ship. </h1>,
app);
</script>
</body>
</html>
20

React Core Concepts
Components
User interfaces can
be broken down into
smaller building
blocks
Props State
21

Component
22

Component
• Creating components
• In React, components are functions. Inside
your script tag, write a function called
Header
<html>
<body>
<script
src="https://unpkg.com/react@17/umd/react.development.js">
</script>
<script src="https://unpkg.com/react-dom@17/umd/react-
<script
src="https://unpkg.com/@babel/standalone/babel.min.js"></scr
ipt>
function Header() {
return <h1>Develop. Preview. Ship. </h1>;
}
ReactDOM.render(<Header />, app);
</script>
</body>
</html>
23

Nesting
Components
• Applications usually include more
content than a single component. You
can nest React components inside
each other like you would regular
HTML elements.
function Header() {
return <h1>Develop. Preview. Ship. </h1>;
}
function HomePage() {
return ( <div> <Header /> </div> );
}
ReactDOM.render(<HomePage />, app);
</script>
24

Component Trees
25

Displaying Data with Props
• Regular HTML elements have attributes that you can use to pass
pieces of information that change the behavior of those elements.
For example, changing the src attribute of an <img> element
changes the image that is shown. Changing the href attribute of an
<a> tag changes the destination of the link.
• In the same way, you can pass pieces of information as properties
to React components. These are called props.
26

Using props
• In your HomePage component, you
can pass a custom title prop to the
Header component, just like you’d
pass HTML attributes
function Header(props) {
return <h1>{props.title}</h1>;
}
return ( <div> <Header title="React 💙" />
<Header title="A new title" /> </div> );
}
ReactDOM.render(<HomePage />, app);
</script>
27

Iterating through
lists
• It’s common to have data that you
need to show as a list. You can use
array methods to manipulate your data
and generate UI elements that are
identical in style but hold different
pieces of information.
const names = ['Ada Lovelace', 'Grace Hopper',
'Margaret Hamilton’];
return (
<div>
<Header title="Develop. Preview. Ship. " />
<ul>
{names.map((name) => (
<li key={name}>{name}</li>
))}
</ul>
</div>
);
}
28

Adding Interactivity with State
• Listening to Events
• Handling Events
• State and Hooks
29

State
• Listening to Events
• Handling Events
• State and Hooks
const [likes, setLikes] = React.useState(0);
function handleClick() {
setLikes(likes + 1);
}
return ( <div> {/* ... */}
<button onClick={handleClick}>Likes
({likes})</button>
</div> );
}
30

From React to Next.js
31

Starting with Next.js
• Install Node.js
• create a new file called package.json with an empty object {}
• In your terminal, run npm install react react-dom next
• Remove
• The react and react-dom scripts since you’ve installed them with NPM.
• The <html> and <body> tags because Next.js will create these for you.
• The code that interacts with app element and ReactDom.render() method.
• The Babel script because Next.js has a compiler that transforms JSX into valid
JavaScript browsers can understand.
• The <script type="text/jsx"> tag.
• The React. part of the React.useState(0) function
32

// index.html
import { useState } from 'react’;
function Header({ title }) {
return <h1>{title ? title : 'Default
title'}</h1>;
}
const names = ['Ada Lovelace', 'Grace
Hopper', 'Margaret Hamilton’];
const [likes, setLikes] = useState(0);
}
return ( <div> <Header title="Develop.
Preview. Ship. " />
<ul>
))}
</ul>
<button onClick={handleClick}>Like
({likes})</button> </div>
);
}
33

Changing Environment
1. Move the index.js file to a new folder called pages (more on this
later).
2. Add default export to your main React component to help Next.js
distinguish which component to render as the main component of
this page.
export default function HomePage() {
Add a script to your package.json file to run the Next.js development
server while you develop.
// package.json { "scripts": { "dev": "next dev" },
// "dependencies": { // "next": "^11.1.0", // "react": "^17.0.2", // "react-
dom": "^17.0.2" // } }
34

Running the development server
import { useState } from 'react’;
function Header({ title }) {
return <h1>{title ? title : 'Default title'}</h1>;
}
export default function HomePage() {
const names = ['Ada Lovelace', 'Grace Hopper', 'Margaret Hamilton’];
const [likes, setLikes] = useState(0);
}
return ( <div> <Header title="Develop. Preview. Ship. " />
<ul>
))}
</ul>
<button onClick={handleClick}>Like ({likes})</button>
</div> );
}
npm run dev
35

Create a Next.js App
npx create-next-app@latest nextjs-blog --use-npm --example "https://github.com/vercel/next-learn/tree/master/basics/learn-starter"
36

Link Component
• On your pages/index.js
• To include link
<Link href="/posts/first-post">this page!</Link>
import Link from 'next/link';
37

Assets, Metadata, and CSS
• Image Component and Image Optimization
import Image from 'next/image’;
return(
<Image src="/images/profile.jpg" // Route of the image file
height={144} // Desired size with correct aspect ratio
width={144} // Desired size with correct aspect ratio
alt="Your Name" />
);
38

Adding Head
39
import Head from 'next/head';
export default function FirstPost() {
return ( <>
<Head> <title>First Post</title> </Head>
<h1>First Post</h1>
<h2> <Link href="/">← Back to home</Link> </h2> </>
);
}

Adding CSS
• Create a file called components/layout.module.css with the
following content:
.container {
max-width: 36rem;
padding: 0 1rem;
margin: 3rem auto 6rem;
}
40

Adding CSS
• Create a top-level directory called components.
• Inside components, create a file called layout.js with the following
content:
import styles from './layout.module.css’;
export default function Layout({ children }) {
return <div className={styles.container}>{children}</div>;
}
41

Adding CSS
import Head from 'next/head’;
import Link from 'next/link’;
import Layout from '../../components/layout’;
export default function FirstPost() {
return ( <Layout>
<Head> <title>First Post</title> </Head>
<h1>First Post</h1>
<h2> <Link href="/">← Back to home</Link> </h2>
</Layout>
);
}
42

THANKS
Do you have any questions?
binumonjosephk@amaljyothi.ac.in
+
919539 373 1
71

NEXT.JS

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