23
loading...
💫 How to add routing loader using nprogress in Next.js?
So Next.js has been very popular nowadays and I am completely switching from the good old React to the Next.js because it's of course better.
With the awesome routing system in Next.js, there are a ton of advantages like events and all that which are very useful when you dig into them.
Today, using the router in Next.js, I'll show you how you can create a page loader that shows a progress bar while we are navigating to a different page. It'll enhance the user experience on your site.
And the process is absolutely simple.
Just a few lines of code as always. We'll use an NPM package called nprogress 
npx create-next-app nprogress-demoYou can use
npm, yarn or pnpm to do this, just install nprogressnpm i nprogress
# If you're using TypeScript, install this too
npm i -D @types/nprogressThe
nprogress package ships with a CSS file which it needs but you have to import it in the _app.js file, so you can create a nprogress.css file in your styles folder and copy and paste styles from this CDN 
After saving the file, you can edit anything you want in that one, I made some changes which fit my needs are as follows:
I changed every background colour from
#29d to #0070f3 and you can change it to any other colour you want/* I made these changes in nprogress.css */
#nprogress .bar {
height: 3px;
}
#nprogress .spinner-icon {
width: 25px;
height: 25px;
border: solid 3px transparent;
}And finally, you can import the CSS file in the
_app.js file// _app.js
import "../styles/nprogress.css";I simply created a
second.js file in the pages folder with these contents. It uses getServerSideProps where we fetch some data on request of the page, so that we get a slight delay while navigating// second.js
import Head from "next/head";
import Image from "next/image";
import Link from "next/link";
import styles from "../styles/Home.module.css";
export default function SecondPage({ data }) {
return (
<div className={styles.container}>
<Head>
<title>Second page</title>
<link rel="icon" href="/favicon.ico" />
</Head>
<main className={styles.main}>
<h1 className={styles.title}>Second page</h1>
<p className={styles.description}>
This is the second page. Go to{" "}
<Link href="/">
<a>Home</a>
</Link>
</p>
<div className={styles.grid}>
{data.map(user => (
<div className={styles.card} key={user.id}>
<h2>{user.name} →</h2>
<p>Works in {user.company.name}</p>
</div>
))}
</div>
</main>
</div>
);
}
export const getServerSideProps = async () => {
const res = await fetch("https://jsonplaceholder.typicode.com/users");
const data = await res.json();
return {
props: {
data: data.slice(0, 4),
},
};
};To show the progress bar, we use the Next.js
Router's events. You can do all the logic inside the _app.js file.// _app.js
import Router from "next/router";
import nProgress from "nprogress";
import "../styles/globals.css";
import "../styles/nprogress.css";
Router.events.on("routeChangeStart", nProgress.start);
Router.events.on("routeChangeError", nProgress.done);
Router.events.on("routeChangeComplete", nProgress.done);
function MyApp({ Component, pageProps }) {
return <Component {...pageProps} />;
}
export default MyApp;When the
routeChangeStart event fires, we start the progress bar by using nProgress.start function.Don't invoke the function like nProgress.start(), pass it without the parenthesis because there should be a callback function in the events.
And when the other two events
routeChangeError, routeChangeComplete occur, we simply pass in nProgress.done which completes the progress bar.In these 5 simple steps, we managed to add a progress bar while navigating to different pages in Next.js. Let me know all your questions in the comments and share this knowledge to others to help them.
23