103 lines
3.5 KiB
Markdown
103 lines
3.5 KiB
Markdown
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# throttle-debounce
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[![Build Status][ci-img]][ci]
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Throttle/debounce your functions.
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This module is the same as [jquery-throttle-debounce][jquery-throttle-debounce] ([with some differences](#differences-with-original-module)), but it’s transferred to CommonJS so it can be easily used with tools like Browserify or Webpack.
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## Install
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```sh
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npm install throttle-debounce --save
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```
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## Usage
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```js
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var throttle = require('throttle-debounce/throttle');
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var debounce = require('throttle-debounce/debounce');
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throttle(300, function () {
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// Throttled function
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});
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debounce(300, function () {
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// Debounced function
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});
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```
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## API
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### throttle(delay, noTrailing, callback, debounceMode)
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Returns: `Function`
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Throttle execution of a function. Especially useful for rate limiting execution of handlers on events like resize and scroll.
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#### delay
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Type: `Number`
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A zero-or-greater delay in milliseconds. For event callbacks, values around 100 or 250 (or even higher) are most useful.
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#### noTrailing
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Type: `Boolean`
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Optional, defaults to false. If noTrailing is true, callback will only execute every `delay` milliseconds while the throttled-function is being called. If noTrailing is false or unspecified, callback will be executed one final time after the last throttled-function call. (After the throttled-function has not been called for `delay` milliseconds, the internal counter is reset)
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#### callback
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Type: `Function`
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A function to be executed after delay milliseconds. The `this` context and all arguments are passed through, as-is, to `callback` when the throttled-function is executed.
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#### debounceMode
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Type: `Boolean`
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If `debounceMode` is true (at begin), schedule `clear` to execute after `delay` ms. If `debounceMode` is false (at end), schedule `callback` to execute after `delay` ms.
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### debounce(delay, atBegin, callback)
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Returns: `Function`
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Debounce execution of a function. Debouncing, unlike throttling, guarantees that a function is only executed a single time, either at the very beginning of a series of calls, or at the very end.
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#### delay
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Type: `Number`
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A zero-or-greater delay in milliseconds. For event callbacks, values around 100 or 250 (or even higher) are most useful.
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#### atBegin
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Type: `Boolean`
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Optional, defaults to false. If `atBegin` is false or unspecified, callback will only be executed `delay` milliseconds after the last debounced-function call. If `atBegin` is true, callback will be executed only at the first debounced-function call. (After the throttled-function has not been called for `delay` milliseconds, the internal counter is reset).
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#### callback
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Type: `Function`
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A function to be executed after delay milliseconds. The `this` context and all arguments are passed through, as-is, to `callback` when the debounced-function is executed.
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## Differences with original module
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* Dependancy on jQuery is removed, so if you rely on GUIDs set by jQuery, plan accordingly
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* There is no standalone version available, so don’t rely on `$.throttle` and `$.debounce` to be available
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## Browser support
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Tested in IE8+ and all modern browsers.
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## License
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**Original module license:** Copyright (c) 2010 "Cowboy" Ben Alman (Dual licensed under the MIT and GPL licenses. http://benalman.com/about/license/)
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**This module license:** MIT © [Ivan Nikolić](http://ivannikolic.com)
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[ci]: https://travis-ci.org/niksy/throttle-debounce
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[ci-img]: https://img.shields.io/travis/niksy/throttle-debounce/master.svg
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[jquery-throttle-debounce]: https://github.com/cowboy/jquery-throttle-debounce
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