Link component for client navigation in NextJS - Step-by-Step Execution

Concept Flow - Link component for client navigation

User clicks Link

↓

Intercept click event

↓

Prevent full page reload

↓

Update URL in browser

↓

Load new page component client-side

↓

Render new page content

↓

User sees new page instantly

When a user clicks a Next.js Link, it stops the browser from reloading the page. Instead, it changes the URL and loads the new page content quickly on the client side.

Execution Sample

NextJS

import Link from 'next/link';

export default function Home() {
  return <Link href="/about">Go to About</Link>;
}

This code shows a Link component that navigates to the About page without reloading the whole browser page.

Execution Table

Step	Action	Event	Result	Browser URL	Page Rendered
1	User clicks Link	click event intercepted	Prevent full reload	/	Home page still visible
2	Next.js updates URL	pushState called	URL changes without reload	/about	Home page still visible
3	Next.js loads About page component	client-side fetch	About page component ready	/about	Home page still visible
4	Next.js renders About page	React render	DOM updates to About page	/about	About page visible
5	User sees About page	no full reload	Fast navigation	/about	About page visible

💡 Navigation completes when About page is rendered client-side without full page reload

Variable Tracker

Variable	Start	After Click	After URL Update	After Page Load	Final
currentURL	"/"	"/"	"/about"	"/about"	"/about"
pageComponent	"Home"	"Home"	"Home"	"About"	"About"
isFullReload	true	false	false	false	false

Key Moments - 3 Insights

Why doesn't the browser reload the whole page when clicking the Link?

Because Next.js intercepts the click event (see execution_table step 1) and uses client-side navigation to update the URL and page content without a full reload.

How does the URL change without reloading the page?

Next.js uses the browser's history API (pushState) to change the URL (see execution_table step 2) while keeping the current page loaded.

When does the new page content actually appear?

After Next.js loads and renders the new page component client-side (see execution_table steps 3 and 4), the DOM updates to show the new page.

Visual Quiz - 3 Questions

Look at the execution table, what is the browser URL immediately after the click event is intercepted?

A "/about"

B "/"

C "/home"

D "/contact"

💡 Hint

Check the 'Browser URL' column at step 1 in the execution_table.

At which step does the page component change from Home to About?

A Step 3

B Step 2

C Step 4

D Step 5

💡 Hint

Look at the 'pageComponent' variable in variable_tracker and the 'Page Rendered' column in execution_table.

If the Link did not intercept the click, what would happen?

A The About page would load instantly client-side

B The URL would not change

C The page would reload fully

D Nothing would happen

💡 Hint

Refer to key_moments question about preventing full reload and execution_table step 1.

Concept Snapshot

Next.js Link component:
- Wraps anchor tags for client navigation
- Intercepts clicks to prevent full reload
- Uses pushState to update URL
- Loads new page component client-side
- Renders new page instantly
- Improves speed and user experience

Full Transcript

The Next.js Link component helps users navigate between pages without the browser reloading the whole page. When a user clicks the Link, Next.js catches the click event and stops the browser from doing a full reload. Instead, it changes the URL using the browser's history API and loads the new page content on the client side. This makes navigation faster and smoother. The execution table shows each step: click intercepted, URL updated, new page component loaded, and finally the new page rendered. Variables like currentURL and pageComponent update accordingly. This process avoids full page reloads and improves user experience.

Practice

1. What is the main purpose of the Link component in Next.js?

easy

A. To style links with CSS automatically

B. To fetch data from an API

C. To navigate between pages without reloading the whole page

D. To create server-side rendered pages

Solution

1. Step 1: Understand the role of Link in Next.js

   The Link component is designed to enable client-side navigation, which means moving between pages without a full page reload.

2. Step 2: Compare options with Link's purpose

   Options A, C, and D describe unrelated features: styling, data fetching, and server rendering, which are not the Link component's main job.

3. Final Answer:

   To navigate between pages without reloading the whole page -> Option C

4. Quick Check:

   Link enables client navigation = B [OK]

Hint: Link is for fast page moves without reloads [OK]

Common Mistakes:

• Thinking Link styles links automatically
• Confusing Link with data fetching tools
• Assuming Link creates server-rendered pages

2. Which of the following is the correct syntax to create a client navigation link to '/about' page using Next.js Link component?

easy

A. About

B. About

C. About

D. About

Solution

1. Step 1: Recall Next.js Link syntax

   The Link component requires an href prop for the destination and wraps an <a> tag for accessibility and styling.

2. Step 2: Evaluate each option

   <Link href='/about'><a>About</a></Link> uses href and wraps <a> correctly. <Link to='/about'>About</Link> uses to which is React Router syntax, not Next.js. <a href='/about'>About</a> is a plain anchor tag without Link, so no client navigation. <Link url='/about'><a>About</a></Link> uses url which is invalid.

3. Final Answer:

   <Link href='/about'><a>About</a></Link> -> Option D

4. Quick Check:

   Use href and wrap <a> = A [OK]

Hint: Link uses href, not to or url, and wraps an <a> tag [OK]

Common Mistakes:

• Using 'to' instead of 'href' in Link
• Not wrapping content inside <a> tag
• Using plain <a> without Link for navigation

3. Given this code snippet, what will happen when the user clicks the link?

import Link from 'next/link';

export default function Home() {
  return (
    <Link href='/contact'><a>Contact Us</a></Link>
  );
}

medium

A. Nothing happens because the Link is missing a required prop

B. The page navigates to '/contact' without a full page reload

C. The page reloads completely and navigates to '/contact'

D. An error is thrown because <a> cannot be inside Link

Solution

1. Step 1: Understand Link behavior on click

   The Link component enables client-side navigation, so clicking the link changes the URL and page content without a full reload.

2. Step 2: Check code correctness

   The code uses href='/contact' and wraps the text inside <a>, which is the correct pattern. No errors or missing props.

3. Final Answer:

   The page navigates to '/contact' without a full page reload -> Option B

4. Quick Check:

   Link click triggers client navigation = C [OK]

Hint: Link with href and <a> navigates client-side [OK]

Common Mistakes:

• Thinking Link causes full page reload
• Believing <a> inside Link causes error
• Assuming missing props cause no navigation

4. Identify the error in this Next.js Link usage:

import Link from 'next/link';

export default function Nav() {
  return (
    <Link href='/services'>Services</Link>
  );
}

medium

A. Missing <a> tag inside Link for proper accessibility

B. Incorrect import statement for Link component

C. href should be a full URL, not a relative path

D. Link component cannot be used inside a function

Solution

1. Step 1: Check Link usage requirements

   Next.js Link requires wrapping the clickable content inside an <a> tag for accessibility and styling.

2. Step 2: Analyze the code snippet

   The code places the text 'Services' directly inside Link without an <a> tag, which is incorrect and can cause accessibility issues.

3. Final Answer:

   Missing <a> tag inside Link for proper accessibility -> Option A

4. Quick Check:

   Link needs <a> inside = D [OK]

Hint: Always wrap Link content in <a> tag [OK]

Common Mistakes:

• Omitting the <a> tag inside Link
• Using full URLs unnecessarily in href
• Thinking Link can't be used in functions

5. You want to create a navigation menu with three links: Home ('/'), About ('/about'), and Contact ('/contact'). Which code correctly uses Next.js Link components to ensure fast client navigation and accessibility?

hard

A.
Home
About
Contact

B.
Home
About
Contact

C.
Home
About
Contact

D.
Home
About
Contact

Solution

1. Step 1: Review correct Link usage for multiple links

   Each Link must have an href prop and wrap an <a> tag for accessibility and client navigation.

2. Step 2: Evaluate each option

   Home About Contact
   correctly uses href and wraps text in <a>.
   Home About Contact
   uses plain anchors without Link, causing full reloads.
   Home About Contact
   uses to which is invalid in Next.js.
   Home About Contact
   uses <span> instead of <a>, breaking accessibility and styling.

3. Final Answer:

   Option A code with Link and <a> tags for all links -> Option A

4. Quick Check:

   Link with href and for all links = A [OK]

Hint: Use href and <a> inside Link for all menu items [OK]

Common Mistakes:

• Using plain <a> without Link causing reloads
• Using 'to' instead of 'href' in Link
• Replacing <a> with <span> inside Link