Emitter

Event emitter implementation using the “frozen closure” pattern as described by Douglas Crockford. Heavily inspired by component/emitter.

Browser support: ES5 compatible browsers (IE9+)

Installation

npm install maxhoffmann/emitter --save

Usage

var Emitter = require('maxhoffmann-emitter');

var emitter = Emitter();

emitter.on('eventName', listener);
emitter.once('eventName', listener); // only listen once

emitter.off('eventName', listener); // remove specific listener
emitter.off('eventName'); // remove all listeners of this event
emitter.off(); // remove all listeners

emitter.trigger('eventName', arg1, arg2…); // arguments are optional

emitter.hasListeners('eventName');
emitter.hasListeners(); // returns true if any listeners are added

Note: This library is built with webpack to the UMD format. You can therefore use it with common.js and amd loaders or as a global variable.

Testing

• cd into directory
• run npm test

Development

npm run build to create a minimized and UMD format compatible version of the source file.

LICENSE

The MIT License