Evmit

A tiny, modern, bare bones event emitter for Node.js and the browser. For the latter it supports Internet Explorer 9+ and works with Browserify or as a standalone library.

Installation

npm

npm install evmit --save

Bower

bower install evmit --save

Usage

Initialization

Node.js and Browserify

var Evmit   = require('evmit')
var emitter = new Evmit()

Standalone

var emitter = new Evmit()

Evmit.on(name, fn)

Subscribe to an event.

• name is the name of the event.
• fn is the function that gets called when the event is emitted.

emitter.on('foo', function() {
  // ...
})
 
emitter.on('foo', function(/* ... */) {
  // ...
})

Evmit.once(name, fn)

Subscribe to an event only once.

• name is the name of the event.
• fn is the function that gets called when the event is emitted.

emitter.once('foo', function() {
  // ...
})
 
emitter.once('foo', function(/* ... */) {
  // ...
})

Evmit.emit(name[, ...])

Trigger an event.

• name is the name of the event.
• ... is the arguments that gets passed to the event.

emitter.emit('foo', { bar: 'baz' })
 
emitter.emit('foo', 'bar', 'baz')

Evmit.off([name, fn])

Unsubscribe from an event or all events.

• name is the name of the event.
• fn is a specific function that's bound to the event.

If name is not provided it'll unsubscribe from all events.

emitter.off()
 
emitter.off('foo')
 
emitter.off('bar', function(/* ... */) {
  // ...
})

Evmit.listeners([name])

Return all events or a single event.

• name is the name of the event.

emitter.listeners()
// => { foo: [...], bar: [...] }
 
emitter.listeners('foo')
// => [...]