Creating, triggering and listening a custom event

customEvent.js

// Defining the custom event
var customEvent = (function () {
	"use strict";
	// Create a generic event
	var e = document.createEvent("Event");
	// Define the custom event name
	e.initEvent("custom", true, true);
	// Grab event to trigger
	return e;
}());

// Trigger the event
document.dispatchEvent(customEvent);

// Listen for the event
document.addEventListener("custom", function () { ... });