Hackernoon logoCreating Highly-Performant Animations using Web Animations API and React hooks by@welly

Creating Highly-Performant Animations using Web Animations API and React hooks

Author profile picture

@wellywelly

Code x Design ✨

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!

Features

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.

Basic Usage

Create an animation by the keyframes (formats) and timing (properties) options.
import React from "react";
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>
  );
};
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 React from "react";
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 React from "react";
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.playState is running or changes.
import React, { 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 React, { 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.
import React from "react";
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
  },
});
Thanks for reading, for more usage details checkout the project's GitHub page: https://github.com/wellyshen/use-web-animations
You can also install this package is distributed via npm.
$ yarn add @wellyshen/use-web-animations
# or
$ npm install --save @wellyshen/use-web-animations

Tags

The Noonification banner

Subscribe to get your daily round-up of top tech stories!