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84 lines
2.4 KiB
Markdown
84 lines
2.4 KiB
Markdown
# raf
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[](http://ci.testling.com/chrisdickinson/raf)
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requestAnimationFrame polyfill for node and the browser.
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```js
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var raf = require('raf')
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raf(function tick() {
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// Animation logic
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raf(tick)
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})
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```
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**Note:** The stream/event emitter logic found in versions prior to 1.0.0 can be found in [raf-stream](https://www.npmjs.org/package/raf-stream).
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## Getting started
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### CommonJS (Node, Browserify, Webpack, etc.)
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Install `raf` from npm:
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```bash
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npm install --save raf
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```
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Require it like you would any other module:
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```js
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const raf = require('raf')
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```
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### AMD (require.js, etc)
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Download the UMD-bundle from [wzrd.in](https://wzrd.in/standalone/raf@latest) (remember to include the current version number in the filename).
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Add it to your AMD module loader config and require it like you would any other module:
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```html
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define(['raf'], raf => {...})
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```
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### `<script>`
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Download the UMD-bundle from [wzrd.in](https://wzrd.in/standalone/raf@latest) (remember to include the current version number in the filename).
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Then include it via a script tag:
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```html
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<script src="raf-x.x.x.js"></script>
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```
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The API will be available on `window.raf`.
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## API
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[Documentation at Mozilla Developer Network](https://developer.mozilla.org/en-US/docs/Web/API/window.requestAnimationFrame), [W3 Specification](http://www.w3.org/TR/animation-timing/#requestAnimationFrame)
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### var handle = raf(callback)
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`callback` is the function to invoke in the next frame. `handle` is a long integer value that uniquely identifies the entry in the callback list. This is a non-zero value, but you may not make any other assumptions about its value.
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### raf.cancel(handle)
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`handle` is the entry identifier returned by `raf()`. Removes the queued animation frame callback (other queued callbacks will still be invoked unless cancelled).
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### raf.polyfill([object])
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Shorthand to polyfill `window.requestAnimationFrame` and `window.cancelAnimationFrame` if necessary (Polyfills `global` in node).
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Alternatively you can require `raf/polyfill` which will act the same as `require('raf').polyfill()`.
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If you provide `object` the polyfills are attached to that given object, instead of the inferred global.
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Useful if you have an instance of a fake `window` object, and want to add `raf` and `caf` to it.
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## Acknowledgments
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Based on work by Erik Möller, Paul Irish, and Tino Zijdel (https://gist.github.com/paulirish/1579671)
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## License
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MIT
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