little-emitter

A tiny event emitter for node and the browser.

Install

npm install little-emitter --save

Usage

The little-emitter can be as a CommonJS/AMD module or a method on global object, such as window in browser.

Node:

var Emitter = require('little-emitter');
var emitter = new Emitter();

emitter.on('init', function(){ console.log('init'); });
emitter.emit('init'); // "init"
emitter.off('init');

Browser:

var emitter = new Emitter();

It can be as a mixin:

var foo = { name: 'Foo' };
Emitter(foo);
// Or
// new Emitter(foo);
// foo = new Emitter(foo);

foo.on('say', function(){ console.log(this.name); });
foo.emit('say'); // "Foo"

API

The Emitter instance methods:

on(type, fn)

Alias: addEventListener

Attach a listener to the emitter.

once(type, fn)

Alias: one

Attach a listener which is executed at most once.

off(type, fn)

Alias: removeEventListener/removeAllListeners

• If nothing is passed, all listeners will be removed.
• If only the type parameter is passed, the given type listeners will be removed.
• If the type and fn are specified, the earliest bound listener for the given type will be removed.

emit(type, [arg1], [arg2], ...)

Alias: trigger

Emit the specified type event and pass some arguments to the listener optionally.

getListeners(type)

Alias: listeners

Return the given type listeners or all listeners or an empty array.

License

MIT.