USE-WEB-ANIMATIONS

Using Web Animations API (a.k.a WAAPI) in the React hook way. Let's create highly-performant, flexible and manipulable web animations in the modern world. Hope you guys 👍🏻 it!

❤️ it? ⭐️ it on GitHub or Tweet about it.

⚡️ Try yourself: https://use-web-animations.netlify.app

⚡️ Try yourself: https://use-web-animations.netlify.app#animations

Features

• 🚀 Animate on the Web with highly-performant and manipulable way, using Web Animations API.
• 🎣 Easy to use, based on React hook.
• 🎛 Super flexible API design that can cover all the cases that you need.
• 🎞 Built-ins animations for you, based on Animate.css.
• 🔩 Supports custom refs for some reasons.
• 📜 Supports TypeScript type definition.
• 🗄️ Server-side rendering compatibility.
• 🦔 Tiny size (~ 4.7KB gzipped). No external dependencies, aside for the react.

Requirement

To use use-web-animations, you must use [email protected] or greater which includes hooks.

Installation

This package is distributed via npm.

$ yarn add @wellyshen/use-web-animations
# or
$ npm install --save @wellyshen/use-web-animations

Before We Start

With the Web Animations API, we can move interactive animations from stylesheets to JavaScript, separating presentation from behavior. The API was designed based on the concept of the CSS Animations but there're still some differences between them. I strongly recommend you to read the documentation before we dive into this hook.

Usage

The API design of the hook not only inherits the DX of the Web Animations API but also provides useful features and sugar events to us. Here are some examples to show you how does it work.

⚠️ polyfill for full browser support.

Basic Usage

Create an animation by the keyframes (formats) and timing (properties) options.

import useWebAnimations from "@wellyshen/use-web-animations";

const App = () => {
  const { ref, playState } = useWebAnimations({
    keyframes: {
      transform: "translateX(500px)", // Move by 500px
      background: ["red", "blue", "green"], // Go through three colors
    },
    timing: {
      delay: 500, // Start with a 500ms delay
      duration: 1000, // Run for 1000ms
      iterations: 2, // Repeat once
      direction: "alternate", // Run the animation forwards and then backwards
      easing: "ease-in-out", // Use a fancy timing function
    },
    onReady: ({ playState, animate, animation }) => {
      // Triggered when the animation is ready to play (Google Chrome: available in v84+)
    },
    onUpdate: ({ playState, animate, animation }) => {
      // Triggered when the animation enters the running state or changes state
    },
    onFinish: ({ playState, animate, animation }) => {
      // Triggered when the animation enters the finished state (Google Chrome: available in v84+)
    },
    // More useful options...
  });

  return (
    <div className="container">
      <p>🍿 Animation is {playState}</p>
      <div className="target" ref={ref} />
    </div>
  );
};

For browsers that don't yet support the onReady and onFinish events, we can use the onUpdate to monitor the animation's state instead.

let prevPending = true;

const App = () => {
  const { ref } = useWebAnimations({
    // ...
    onUpdate: ({ playState, animation: { pending } }) => {
      if (prevPending && !pending) {
        console.log("Animation is ready to play");
      }
      prevPending = pending;

      if (playState === "finished") {
        console.log("Animation has finished playing");
      }
    },
  });

  // ...
};

Playback Control

The shortcoming with existing technologies was the lack of playback control. The Web Animations API provides several useful methods for controlling playback: play, pause, reverse, cancel, finish, seek, control speed via the methods of the Animation interface. This hook exposes the animation instance for us to interact with animations, we can access it by the getAnimation() return value.

import useWebAnimations from "@wellyshen/use-web-animations";

const App = () => {
  const { ref, playState, getAnimation } = useWebAnimations({
    playbackRate: 0.5, // Change playback rate, default is 1
    autoPlay: false, // Automatically starts the animation, default is true
    keyframes: { transform: "translateX(500px)" },
    timing: { duration: 1000, fill: "forwards" },
  });

  const play = () => {
    getAnimation().play();
  };

  const pause = () => {
    getAnimation().pause();
  };

  const reverse = () => {
    getAnimation().reverse();
  };

  const cancel = () => {
    getAnimation().cancel();
  };

  const finish = () => {
    getAnimation().finish();
  };

  const seek = (e) => {
    const animation = getAnimation();
    const time = (animation.effect.getTiming().duration / 100) * e.target.value;
    animation.currentTime = time;
  };

  const updatePlaybackRate = (e) => {
    getAnimation().updatePlaybackRate(e.target.value);
  };

  return (
    <div className="container">
      <button onClick={play}>Play</button>
      <button onClick={pause}>Pause</button>
      <button onClick={reverse}>Reverse</button>
      <button onClick={cancel}>Cancel</button>
      <button onClick={finish}>Finish</button>
      <input type="range" onChange={seek} />
      <input type="number" defaultValue="1" onChange={updatePlaybackRate} />
      <div className="target" ref={ref} />
    </div>
  );
};

Getting Animation's Information

When using the Web Animations API, we can get the information of an animation via the properties of the Animation interface. However, we can get the information of an animation by the getAnimation() return value as well.

import useWebAnimations from "@wellyshen/use-web-animations";

const App = () => {
  const { ref, getAnimation } = useWebAnimations({
    keyframes: { transform: "translateX(500px)" },
    timing: { duration: 1000, fill: "forwards" },
  });

  const speedUp = () => {
    const animation = getAnimation();
    animation.updatePlaybackRate(animation.playbackRate * 0.25);
  };

  const jumpToHalf = () => {
    const animation = getAnimation();
    animation.currentTime = animation.effect.getTiming().duration / 2;
  };

  return (
    <div className="container">
      <button onClick={speedUp}>Speed Up</button>
      <button onClick={jumpToHalf}>Jump to Half</button>
      <div className="target" ref={ref} />
    </div>
  );
};

The animation instance isn't a part of React state, which means we need to access it by the getAnimation() whenever we need. If you want to monitor an animation's information, here's the onUpdate event for you. The event is implemented by the requestAnimationFrame internally and the event callback is triggered when the animation enters running state or changes state.

import { useState } from "react";
import useWebAnimations from "@wellyshen/use-web-animations";

const App = () => {
  const [showEl, setShowEl] = useState(false);
  const { ref } = useWebAnimations({
    keyframes: { transform: "translateX(500px)" },
    timing: { duration: 1000, fill: "forwards" },
    onUpdate: ({ animation }) => {
      if (animation.currentTime > animation.effect.getTiming().duration / 2)
        setShowEl(true);
    },
  });

  return (
    <div className="container">
      {showEl && <div className="some-element" />}
      <div className="target" ref={ref} />
    </div>
  );
};

Dynamic Interactions with Animation

We can create and play an animation at the timing we want by the animate() return value, which is implemented based on the Element.animate(). It's useful for interactions and the composite modes.

Let's create a mouse interaction effect:

import { useEffect } from "react";
import useWebAnimations from "@wellyshen/use-web-animations";

const App = () => {
  const { ref, animate } = useWebAnimations();

  useEffect(() => {
    document.addEventListener("mousemove", (e) => {
      // The target will follow the mouse cursor
      animate({
        keyframes: { transform: `translate(${e.clientX}px, ${e.clientY}px)` },
        timing: { duration: 500, fill: "forwards" },
      });
    });
  }, [animate]);

  return (
    <div className="container">
      <div className="target" ref={ref} />
    </div>
  );
};

Create a bounce effect via lifecycle and composite mode:

import useWebAnimations from "@wellyshen/use-web-animations";

const App = () => {
  const { ref, animate } = useWebAnimations({
    id: "fall", // Set animation id, default is empty string
    keyframes: [{ top: 0, easing: "ease-in" }, { top: "500px" }],
    timing: { duration: 300, fill: "forwards" },
    onFinish: ({ animate, animation }) => {
      // Lifecycle is triggered by each animation, we can check the id to prevent animation from repeating
      if (animation.id === "bounce") return;

      animate({
        id: "bounce",
        keyframes: [
          { top: "500px", easing: "ease-in" },
          { top: "10px", easing: "ease-out" },
        ],
        timing: { duration: 300, composite: "add" },
      });
    },
  });

  return (
    <div className="container">
      <div className="target" ref={ref} />
    </div>
  );
};

⚠️ Composite modes isn't fully supported by all the browsers, please check the browser compatibility carefully before using it.

Use Built-in Animations

Too lazy to think about animation? We provide a collection of ready-to-use animations for you, they are implemented based on Animate.css.

👉🏻 Check out the demo.

import useWebAnimations, { bounce } from "@wellyshen/use-web-animations";

const App = () => {
  // Add a pre-defined effect to the target
  const { ref } = useWebAnimations({ ...bounce });

  return (
    <div className="container">
      <div className="target" ref={ref} />
    </div>
  );
};

We can customize the built-in animation by overriding its properties:

const { keyframes, timing } = bounce;
const { ref } = useWebAnimations({
  keyframes,
  timing: {
    ...timing,
    delay: 1000, // Delay 1s
    duration: timing.duration * 0.75, // Speed up the animation
  },
});

Use Your Own ref

In case of you had a ref already or you want to share a ref for other purposes. You can pass in the ref instead of using the one provided by this hook.

const ref = useRef();
const { playState } = useWebAnimations({ ref });

API

const returnObj = useWebAnimations(options?: object);

Return Object

It's returned with the following properties.

Parameter

The options provides the following configurations and event callbacks for you.

Use Polyfill

Web Animations API has good support amongst browsers, but it's not universal. You'll need to polyfill browsers that don't support it. Polyfills is something you should do consciously at the application level. Therefore use-web-animations doesn't include it.

Install web-animations-js:

$ yarn add web-animations-js
# or
$ npm install --save web-animations-js

Then import it at your app's entry point:

import "web-animations-js/web-animations.min";

You can read the document for more information.

Contributors ✨

Thanks goes to these wonderful people (emoji key):

This project follows the all-contributors specification. Contributions of any kind welcome!