Active link detection in NextJS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is active link detection in Next.js?

Active link detection means identifying which navigation link matches the current page URL, so you can style it differently to show users where they are.

beginner

Which Next.js hook helps detect the current route for active link detection?

The usePathname hook from next/navigation returns the current URL path, which helps in detecting the active link.

intermediate

How can you conditionally apply a CSS class to an active link in Next.js?

Compare the link's href with the current pathname from <code>usePathname</code>. If they match, add an 'active' CSS class to style the link differently.

intermediate

Why is it better to use Next.js built-in hooks for active link detection instead of window.location?

Next.js hooks like usePathname work properly in client components, handling server-side rendering seamlessly without hydration errors, unlike window.location which only exists in the browser.

beginner

Show a simple example of active link detection using Next.js usePathname.

'use client';
import Link from 'next/link';
import { usePathname } from 'next/navigation';

export default function Nav() {
  const pathname = usePathname();
  return (
    <nav>
      <Link href="/" className={pathname === '/' ? 'active' : ''}>Home</Link>
      <Link href="/about" className={pathname === '/about' ? 'active' : ''}>About</Link>
    </nav>
  );
}

Which Next.js hook is used to get the current URL path for active link detection?

A useLocation

B useRouter

C usePathname

D useLink

The usePathname hook from next/navigation returns the current path, perfect for active link detection.

Why should you avoid using window.location for active link detection in Next.js?

A It does not exist during server-side rendering

B It is slower than hooks

C It causes styling issues

D It is deprecated in Next.js

window.location is only available in the browser, so it breaks server-side rendering in Next.js.

What is the main purpose of active link detection in navigation menus?

A To load pages faster

B To change the URL automatically

C To disable unused links

D To highlight the current page link

Active link detection highlights the link of the page the user is currently on, improving navigation clarity.

In Next.js, where do you import the usePathname hook from?

A next/navigation

B next/router

C react-router-dom

D next/link

usePathname is imported from next/navigation in Next.js 13+.

How do you apply a different style to an active link in Next.js?

A Use JavaScript alert on click

B Add a CSS class conditionally when the link matches the current path

C Change the link text color manually

D Use inline styles on all links

You conditionally add a CSS class to the link when its href matches the current pathname to style it as active.

Explain how active link detection works in Next.js and why it is useful.

Think about how you know which page you are on in a website menu.

Describe a simple way to implement active link detection in a Next.js navigation component.

Focus on the steps from getting the path to styling the link.