selectize/src/contrib/microevent.js

Selectize is a jQuery-based custom <select> UI control. Useful for tagging, contact lists, country selectors, etc.

/**
 * MicroEvent - to make any js object an event emitter
 *
 * - pure javascript - server compatible, browser compatible
 * - dont rely on the browser doms
 * - super simple - you get it immediatly, no mistery, no magic involved
 *
 * @author Jerome Etienne (https://github.com/jeromeetienne)
 */

var MicroEvent = function() {};
MicroEvent.prototype = {
	on: function(event, fct){
		this._events = this._events || {};
		this._events[event] = this._events[event] || [];
		this._events[event].push(fct);
	},
	off: function(event, fct){
		var n = arguments.length;
		if (n === 0) return delete this._events;
		if (n === 1) return delete this._events[event];

		this._events = this._events || {};
		if (event in this._events === false) return;
		this._events[event].splice(this._events[event].indexOf(fct), 1);
	},
	trigger: function(event /* , args... */){
		this._events = this._events || {};
		if (event in this._events === false) return;
		for (var i = 0; i < this._events[event].length; i++){
			this._events[event][i].apply(this, Array.prototype.slice.call(arguments, 1));
		}
	}
};

/**
 * Mixin will delegate all MicroEvent.js function in the destination object.
 *
 * - MicroEvent.mixin(Foobar) will make Foobar able to use MicroEvent
 *
 * @param {object} the object which will support MicroEvent
 */
MicroEvent.mixin = function(destObject){
	var props = ['on', 'off', 'trigger'];
	for (var i = 0; i < props.length; i++){
		destObject.prototype[props[i]] = MicroEvent.prototype[props[i]];
	}
};