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function monitorEvents(element) {
var log = function(e) { console.log(e);};
var events = [];
for(var i in element) {
if(i.startsWith("on")) events.push(i.substr(2));
events.forEach(function(eventName) {
element.addEventListener(eventName, log);

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commented Dec 26, 2017

ES6 Version with some optimizations (optional callback):

let monitorEvents = (el, callback) => {
  let eventCallback = callback || ((e) => console.log(e));
  let events = [];

  for(var i in el) {
    if(i.startsWith("on")) events.push(i.substr(2));
  events.forEach(eventName => el.addEventListener(eventName, eventCallback)); 
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