canvas-confetti

Demo

catdad.github.io/canvas-confetti

Install

You can install this module as a component from NPM:

npm install --save canvas-confetti

You can then require('canvas-confetti'); to use it in your project build. Note: this is a client component, and will not run in Node. You will need to build your project with something like webpack in order to use this.

You can also include this library in your HTML page directly from a CDN:

<script src="https://cdn.jsdelivr.net/npm/canvas-confetti@0.0.3/dist/confetti.browser.min.js"></script>

Note: you should use the latest version at the time that you include your project. You can see all versions on the releases page.

API

When installed from npm, this library can be required as a client component in your project build. When using the CDN version, it is exposed as a confetti function on window.

confetti([options {Object}]) → Promise|null

confetti takes a single optional object. When window.Promise is available, it will return a Promise to let you know when it is done. When promises are not available (like in IE), it will return null. You can polyfill promises using any of the popular polyfills. You can also provide a promise implementation to confetti through:

const MyPromise = require('some-promise-lib');
const confetti = require('canvas-confetti');
confetti.Promise = MyPromise;

If you call confetti multiple times before it is done, it will return the same promise every time. Internally, the same canvas element will be reused, continuing the existing animation with the new confetti added. The promise returned by each call to confetti will resolve once all animations are done.

options

The confetti parameter is a single optional options object, which has the following properties:

• particleCount Integer (default: 50): The number of confetti to launch. More is always fun... but be cool, there's a lot of math involved.
• angle Number (default: 90): The angle in which to launch the confetti, in degrees. 90 is straight up.
• spread Number (default: 45): How far off center the confetti can go, in degrees. 45 means the confetti will launch at the defined angle plus or minus 22.5 degrees.
• startVelocity Number (default: 45): How fast the confetti will start going, in pixels.
• decay Number (default: 0.9): How quickly the confetti will lose speed. Keep this number between 0 and 1, otherwise the confetti will gain speed. Better yet, just never change it.
• ticks Number (default: 200): How many times the confetti will move. This is abstract... but play with it if the confetti disappear too quickly for you.
• origin Object: Where to start firing confetti from. Feel free to launch off-screen if you'd like.
  • origin.x Number (default: 0.5): The x position on the page, with 0 being the left edge and 1 being the right edge.
  • origin.y Number (default: 0.5): The y position on the page, with 0 being the top edge and 1 being the bottom edge.
• colors Array<String>: An array of color strings, in the HEX format... you know, like #bada55.
• zIndex Integer (default: 100): The confetti should be on top, after all. But if you have a crazy high page, you can set it even higher.

Examples

Launch some confetti the default way:

confetti();

Launch a bunch of confetti:

confetti({
  particleCount: 150
});

Launch some confetti really wide:

confetti({
  spread: 180
});

Get creative. Launch a small poof of confetti from a random part of the page:

confetti({
  particleCount: 100,
  startVelocity: 30,
  spread: 360,
  origin: {
    x: Math.random(),
    // since they fall down, start a bit higher than random
    y: Math.random() - 0.2
  }
});

In some cases you may need to destoy confetti, you can do this by calling method destroy

confetti.destroy();

I said creative... we can do better. Since it doesn't matter how many times we call confetti (just the total number of confetti in the air), we can do some fun things, like continuously launch more and more confetti for 30 seconds, from multiple directions:

// do this for 30 seconds
var duration = 30 * 1000;
var end = Date.now() + duration;

(function frame() {
  // launch a few confetti from the left edge
  confetti({
    particleCount: 7,
    angle: 60,
    spread: 55,
    origin: { x: 0 }
  });
  // and launch a few from the right edge
  confetti({
    particleCount: 7,
    angle: 120,
    spread: 55,
    origin: { x: 1 }
  });

  // keep going until we are out of time
  if (Date.now() < end) {
    requestAnimationFrame(frame);
  }
}());