How to implement a smooth scroll-to-top button in Next.js



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Implementing a smooth scroll-to-top button in a Next.js application involves a few steps. First, you'll need to create the button itself, then handle the scrolling behavior. Here's a basic example of how you can achieve this:

  1. Create the Scroll-to-Top Button Component:

Create a new component for your scroll-to-top button. This component will render a button and handle the click event to scroll to the top of the page.

jsx
// components/ScrollToTopButton.js
import { useEffect, useState } from 'react';
import styles from './ScrollToTopButton.module.css';

const ScrollToTopButton = () => {
  const [isVisible, setIsVisible] = useState(false);

  useEffect(() => {
    // Show the button when user scrolls down
    const handleScroll = () => {
      if (window.pageYOffset > 300) {
        setIsVisible(true);
      } else {
        setIsVisible(false);
      }
    };

    window.addEventListener('scroll', handleScroll);

    return () => window.removeEventListener('scroll', handleScroll);
  }, []);

  const scrollToTop = () => {
    window.scrollTo({
      top: 0,
      behavior: 'smooth', // Smooth scroll behavior
    });
  };

  return (
    <button
      className={`${styles.scrollToTop} ${isVisible ? styles.visible : ''}`}
      onClick={scrollToTop}
    >
      Scroll To Top
    </button>
  );
};

export default ScrollToTopButton;
  1. Style the Scroll-to-Top Button:

You can style the button using CSS. Here's an example using CSS Modules:

css
/* components/ScrollToTopButton.module.css */
.scrollToTop {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
  cursor: pointer;
}

.scrollToTop.visible {
  opacity: 1;
}
  1. Implement the Button in Your Layout or Page:

Finally, integrate the scroll-to-top button component into your layout or pages where you want it to appear.

jsx
// pages/_app.js or any other component or layout
import ScrollToTopButton from '../components/ScrollToTopButton';

function MyApp({ Component, pageProps }) {
  return (
    <>
      <Component {...pageProps} />
      <ScrollToTopButton />
    </>
  );
}

export default MyApp;

With this setup, the button will appear when the user scrolls down the page and will smoothly scroll back to the top when clicked. Adjust the styles and behavior as needed to fit your application's design and requirements.

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