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@arnellebalane/event-emitter

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@arnellebalane/event-emitter

JavaScript EventEmitter implementation

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EventEmitter

JavaScript EventEmitter implementation.

Installation

Install via npm (or yarn):

npm install @arnellebalane/event-emitter

Or via CDN (unpkg.com):

<script src="https://unpkg.com/@arnellebalane/event-emitter/dist/event-emitter.umd.js"></script>

Usage

This module exposes a class that you can extend from to make your own classes support emitting events and being listened to for events.

import EventEmitter from '@arnellebalane/event-emitter';

class MyClass extends EventEmitter {
    // ...
}

This class is exposed as window.EventEmitter when not using AMD or CommonJS.

API

Instances of EventEmitter and its subclasses will have the following methods:

  • .on(name, callback): Listen for an event to be emitted from the instance.
    • name (String). The name of the event to listen to.
    • callback (Function). The function to run when the event is emitted.
  • .off(name[, callback]): Stop listening for an event to be emitted from the instance.
    • name (String). The name of the event to stop listening to.
    • callback (Function, Optional). The callback function to remove. If given, only that callback will be removed. Otherwise, all callback functions for that event will be removed.
  • .emit(name[, data]): Broadcast an event to all observers.
    • name (String). The name of the event to broadcast.
    • data (Any, Optional). The data to be passed to the callback functions.

License

MIT License

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Package last updated on 05 Nov 2018

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