React Scrollspy Component

react-scrollspy-navigation is a React Component, that automatically update navigation components based on scroll position to indicate which link is currently active in the viewport. It also scrolls (navigation) to viewport when click on a navigation component.

Demo with example code

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How to install

Install via NPM or Yarn package manager

npm i react-scrollspy-navigation

yarn add react-scrollspy-navigation

How to use it

Add a unique id to content blocks or heading tags for the elements you want to spy on. There is nothing more to do with the content elements. It's awfully simple so far, right?

// Content blocks
conat ContentWithBoxes = () => {
  return (
    <>
      <section id="target-1">Content here</section>
      <section id="target-2">Content here</section>
      <section id="target-3">Content here</section>
    </>
)};

// Heading tags
conat ContentWithHeaders = () => {
  return (
    <>
      <section>
        <h2 id="target-1">Target 1</h2>
      </section>
      <section>
        <h2 id="target-2">Target 2</h2>
      </section>
      <section>
        <h2 id="target-3">Target 3</h2>
      </section>
    </>
)};

Wrap your navigation structure with ScrollSpy component. Use only a tags whose href attribute is the hash link of the id of an existing content element. You can use structures of any complexity or depth in the ScrollSpy component, and you can nest multiple ScrollSpy components (although this works, it is not recommended). Don't worry, ScrollSpy won't add any additional structures to the child component.

Note:

If you are new to url hashes, here is some information: https://en.wikipedia.org/wiki/URI_fragment

import ScrollSpy from 'react-scrollspy-navigation';

// Last item won't use as ScrollSpy item, but you can place there.
// Obviously, non hash links will not be processed.
const Navigation = () => {
  return (
    <ScrollSpy activeClass="nav-active">
      <nav>
        <ul>
          <li>
            <a href="#target-1">...</a>
          </li>
          <li>
            <a href="#target-2">...</a>
          </li>
          <li>
            <a href="#target-3">...</a>
          </li>
        </ul>
      </nav>
    </ScrollSpy>
  );
};

Don't forget to specify in the activeClass prop what className to add to the currently active link. Congratulations, we are done, it was that simple. Continue reading the documentation to find out what options are available to configure how ScrollSpy works.

Note:

The much loved Refs used in the previous version and React were thrown away.

Configuration

Available ScrollSpy component properties

Parameters for using the onClickEach(event, handler, container) function.

• event: The original Click Event.
• handler: The internal click handler function. This should be called at the end of the onClickEach function, as you want the internal click handler to run.
• container: The target html element. Always try to find the scrollable parent of the linked element.

Example:

const Comp = () => {
  const onClickEach = (e, handler, container) => {
    console.log('The clicked element:', e.target);
    console.log('The container element of target:', container);
    // You can do something here if you want.
    handler();
  };

  return <ScrollSpy onClickEach={onClickEach}>...</ScrollSpy>;
};

Compatibility

A component depends on the following functions or classes, which define its compatibility.

• Scroll methods on elements (scroll, scrollTo, scrollBy): supported browsers
• IntersectionObserver API: supported browsers

Example code

Check out the interactive demo and example codes.

Demo with example code

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Guidelines

To learn about the guidelines, please read the Code of Conduct, Contributing and Security Policy documents.

License

MIT License @ 2021 Zsolt Tövis

If you found this project interesting, please consider supporting my open source work by sponsoring me on GitHub / sponsoring me on PayPal / give the repo a star.