rive-js

Rive.js -- Rive's Web API

BETA RELEASE! (latest 0.7.0)

Rive.js is fresh off the presses and in beta; the api is subject to change as we try to make it fit for purpose. Please file issues and PRs for anything busted, missing, or just plain wrong.

The api surface is highly likely to change with each release, so please make sure to specify which version you're using when importing the script:

<script src="https://unpkg.com/rive-js@0.7.0/dist/rive.min.js"></script>

{
  "name": "my-app",
  "dependencies": {
    "rive-js": "0.7.0"
  }
}

Please see the changelog for info on changes.

Installing

The simplest way to get this running is copy dist/rive.min.js into your project.

Quick Start

Play the first animation in the default artboard:

<canvas id="canvas"></canvas>
<script src="https://unpkg.com/rive-js@0.7.0/dist/rive.min.js"></script>
<script>
    // autoplays the first animation in the default artboard
    rive.Rive.new({
        src: 'https://cdn.rive.app/animations/off_road_car_v7.riv',
        canvas: document.getElementById('canvas'),
        autoplay: true,
    });
</script>

Layout

Rive.js lets you decide how your animations will be laid out in the canvas. The Layout objects lets you set the fit, alignment and optinonally the min and max of the x/y coordinates.

These can be set when a Rive object is first created:

rive.Rive.new({
    src: 'https://cdn.rive.app/animations/off_road_car_v7.riv',
    canvas: document.getElementById('canvas'),
    layout: rive.Layout.new({fit: 'contain', alignment: 'topRight'}),
    autoplay: true,
});

The layout can be updated at any time with the layout setter:

    const r = rive.Rive.new({
        src: 'https://cdn.rive.app/animations/off_road_car_v7.riv',
        canvas: document.getElementById('canvas'),
        autoplay: true,
    });

    r.layout = rive.Layout.new({fit: rive.Fit.Cover, alignment: rive.Alignment.BottomCenter});

Note that either strings or the enum type can be used for the fit and alignment parameters.

Playing and Mixing Animations

Rive.js requires two things: a link to the Rive file, and a canvas element where the animation should be rendered. Setting autoplay: true will play a one-shot animation once, or a looping animation continuously.

If you want to specify which artboard or animation to play:

rive.Rive.new({
    src: 'https://cdn.rive.app/animations/off_road_car_v7.riv',
    canvas: document.getElementById('canvas'),
    artboard: 'New Artboard',
    animations: 'idle',
    autoplay: true,
});

animations can also take a list of animations, which will be mixed together:

rive.Rive.new({
    src: 'https://cdn.rive.app/animations/off_road_car_v7.riv',
    canvas: document.getElementById('canvas'),
    animations: ['idle', 'windshield_wipers', 'bouncing'],
    autoplay: true,
});

You can manually start and pause playback, and check if playback is active:

const r = rive.Rive.new({
    src: 'https://cdn.rive.app/animations/off_road_car_v7.riv',
    canvas: document.getElementById('canvas'),
});

r.play();
r.pause();
r.isPlaying ? console.log('Playing') : console.log('Not playing');

If you want to play, or mix in, more animations, play can take an array of animation names:

r.play(['windshield_wipers']);

If you want to pause animations, while still have others playing, pause can also take an array of animation names:

r.pause(['windshield_wipers', 'bouncing']);

Same goes for stopping animations:

r.stop(['idle']);

It's important to note that unless you specifically pause or stop looping animations, they'll play forever. one-shot animations will automatically stop when they reach the end of the animation, so you can repeatedly call play([<one-shot>]) and it will replay the animation so long at it has finished its animation.

If Rive's data is being loaded by other means, you can pass in an ArrayBuffer:

const reader = new FileReader();
reader.onload = () => {
    const riveArrayBuffer = reader.result;
    rive.Rive.new({
        buffer: riveArrayBuffer,
        canvas: document.getElementById('canvas'),
    });
};
reader.readAsArrayBuffer(file);

Events

Rive.js has a number of events that you can listen for:

const r = rive.Rive.new({
    src: 'https://cdn.rive.app/animations/off_road_car_v7.riv',
    canvas: document.getElementById('canvas'),
});

// See what animations are on the artboard once the Rive file loads
r.on('load', () => {
    console.log('Animations ' + rive.animationNames());
});

// onloop will pass the name of the looped animation and loop type; useful when mixing multiple animations together
r.on('loop', (event) => {
    console.log(event.animationName + ' has looped as a ' + event.loopName);
});

Event callbacks currently supported are:

• onload: fired when the Rive file is loaded and ready for playback
• onloaderror: fired if an error occurred while trying to load a Rive file
• onplay: Rive has started playing an animation
• onpause: playback has been paused
• onloop: one of the playing animations has looped (LoopEvent)
• onstop: playback has stopped (when the animation completes if not a looping animation)

Other Functions

• source: returns the source for the animation
• animationNames: returns a list of animations on the chosen (or default) artboard

Examples

To run the examples in the examples folder, run a HTTP server at the root of the js directory. If you have Python installed, the following works nicely:

python3 -m http.server 8000

or Node:

npx http-server

and then navigate to the examples, e.g.: http://localhost:8000/examples/hello_world/index.html.