emit-it

A simple event emitter that can be used standalone or subclassed in ES6.

Installation

npm install emit-it --save

Usage

Import the module using your packaging system. The emitter can be used on its own, or as a base class.

Standalone

Using browserify

var EmitIt = require('emit-it');
var emitter = new EmitIt();

emitter.subscribe('example', function() { 
    console.log('example event emitted') 
});
 
emitter.emit('example'); //example event emitted

Using ES6/Babel

import EmitIt from 'emit-it';
let emitter = new EmitIt();

emitter.subscribe('example', function() { 
    console.log('example event emitted') 
});
 
emitter.emit('example'); //example event emitted

Base Class (ES6/Babel)

import EmitIt from 'emit-it';

class Foo extends EmitIt{
    constructor(){
        this.message = "event emitted from class";
    }
    someMethod(){
        this.emit('example');
    }
}

let foo = new Foo();
foo.subscribe('example', function(bar) { 
    console.log(bar.message) 
});
 
foo.someMethod(); //event emitted from class

Methods

• subscribe(to, subscriber) - Subscribes the subscriber function to the specified event
  • returns A subscriber object containing the event name and the index of the subscriber that can be passed to unsubscribe
• unsubscribe(ticket) - Unsubscribes a subscriber from an event
  • returns Success {boolean}
• emit(event [, ...args]) - Emits the specified event passing your class (this) and any additional arguments to the subscriber
• event(event) - Gets the specified event
  • returns An object containing methods remove and clear
• event(event).remove - Removes the specified event and all subscribers
• event(event).clear - Clears all subscribers from an event

Tests

npm test

Release History

• 0.1.0 Initial release