react-lottie's Introduction

React Lottie

A React hook to render Lottie animations using Airbnb’s JavaScript library.

Install

npm install @joshuabaker/react-lottie

yarn add @joshuabaker/react-lottie

Usage

The useLottie hook takes two arguments:

A container ref for the HTML element that you want to use as the canvas
A set of params that are passed to lottie-web

Important

You must pass either path to a Lottie JSON file or the raw JSON via animationData.

Please see the lottie-web docs for all argument params, methods and events.

Simple Example

import { useLottie } from "@joshuabaker/react-lottie";

function Animation(props) {
  const containerRef = useRef();

  const animationItem = useLottie(containerRef, {
    path: "/path/to/lottie.json",
    autoplay: false,
    loop: false,
  });

  return <div ref={containerRef} {...props} />
}

Controls & Events

import { useLottie } from "@joshuabaker/react-lottie";
import HeartAnimationData from "../lottie-animations/heart.json";

function Animation(props) {
  const containerRef = useRef();

  const animationItem = useLottie(containerRef, {
    animationData: HeartAnimationData,
  });

  useEffect(() => {
    if (animationItem) {
      // Add event listeners here
    }
  }, [animationItem]);

  return (
    <div
      ref={containerRef}
      onClick={() => animationItem?.togglePause()}
      {...props}
    />
  );
}

Warning

Do not call addEventListener or removeEventListener using optional chaining. Instead wrap with a simple if condition.

useEffect(() => {
  if (animationItem) {
    animationItem.addEventListener("complete", completeHandler); // Do this
  }

  animationItem?.addEventListener("complete", completeHandler); // Don’t do this
}, [animationItem]);

This is due to how lottie-web internally handles events.

Why?

Other hooks output a <div> or a ref, both of which reduce the flexibility hooks should provide. This hook acts like a hook should, accepting a ref and animation params.

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