sjmulder / event-registrar

JS events (addListener/emit/etc) with just a single function – no base class required.

event-registrar implements an event system inspired by EventEmitter without requiring using a base (prototype) class but instead by supplying a single, standalone, registerEvent function.

Usage example from sample.html:

var Greeter = function() {
	registerEvent(this, 'hello');
	registerEvent(this, 'goodbye');
};

var greeter = new Greeter();

greeter.on('hello', function(subject) {
	document.write('Hello to ' + subject + '<br>');
});

greeter.once('hello', function(subject) {
	document.write('Indeed, very hello to ' + subject + '<br>');
});

function onGoodbye(preposition, subject) {
	document.write('Goodbye ' + preposition + ' ' + subject + '<br>');
};

greeter.on('goodbye', onGoodbye);
greeter.emit('hello', 'you');
greeter.emit('hello', 'him');
greeter.emit('goodbye', 'to', 'you');
greeter.removeListener('goodbye', onGoodbye);
greeter.emit('goodbye', 'from', 'me');

Written by and © Sijmen Mulder [e-mail]. Released under the 3-clause BSD license, see License.md.