How to work with events in pure JavaScript?

by smotchkkiss

HTML

<p>check the console</p>

JavaScript

function Emitter() {
  var eventTarget = document.createDocumentFragment();

  function delegate (method) {
    this[method] = eventTarget[method].bind(eventTarget);
  }

  [
    "addEventListener",
    "dispatchEvent",
    "removeEventListener"
  ].forEach(delegate, this);
}

function MyClass(text){

  Emitter.call(this);

  function show() {
    console.log("MyText:", text);
    this.dispatchEvent(new Event("end"));
  }

  this.show = show;
}

function onEnd(event){
  console.log("Event dispatched:", event);
}

function run(){
  var myInstance = new MyClass("I have something to say...");
  myInstance.addEventListener("end", onEnd, false);
  myInstance.show();
}

run();