動的にアタッチされるイベント・リスナーが存在するかどうかを確認するには？

elem.onclick = function () { console.log (1) }

const element = document.getElementById('div');

if (element.getAttribute('listener') !== 'true') {
     element.addEventListener('click', function (e) {
         const elementClicked = e.target;
         elementClicked.setAttribute('listener', 'true');
         console.log('event has been attached');
    });
}

// initial load
var attached = false;

// this will only execute code once
doSomething = function() {
  if (!attached) {
    attached = true;
    //code
  }
} 

//attach your function with change event
window.onload = function() {
    var txtbox = document.getElementById("textboxID");
    if(window.addEventListener){
        txtbox.addEventListener("change", doSomething, false);
    } else if(window.attachEvent){
        txtbox.attachEvent("onchange", doSomething);
    }
}

/* Create a storage object. */
var CustomEventStorage = [];

/* The function that finds a record in the storage by a given element. */
function findRecordByElement (element) {
    /* Iterate over every entry in the storage object. */
    for (var index = 0, length = CustomEventStorage.length; index < length; index++) {
        /* Cache the record. */
        var record = CustomEventStorage[index];

        /* Check whether the given element exists. */
        if (element == record.element) {
            /* Return the record. */
            return record;
        }
    }

    /* Return false by default. */
    return false;
}

/* The function that adds an event listener, while storing it in the storage object. */
function insertListener (element, event, listener, options) {
    /* Use the element given to retrieve the record. */
    var record = findRecordByElement(element);

    /* Check whether any record was found. */
    if (record) {
        /* Normalise the event of the listeners object, in case it doesn't exist. */
        record.listeners[event] = record.listeners[event] || [];
    }
    else {
        /* Create an object to insert into the storage object. */
        record = {
            element: element,
            listeners: {}
        };

        /* Create an array for event in the record. */
        record.listeners[event] = [];

        /* Insert the record in the storage. */
        CustomEventStorage.push(record);
    }

    /* Insert the listener to the event array. */
    record.listeners[event].push(listener);

    /* Add the event listener to the element. */
    element.addEventListener(event, listener, options);
}

/* The function that checks whether an event listener is set for a given event. */
function listenerExists (element, event, listener) {
    /* Use the element given to retrieve the record. */
    var record = findRecordByElement(element);

    /* Check whether a record was found & if an event array exists for the given event. */
    if (record && event in record.listeners) {
        /* Return whether the given listener exists. */
        return !!~record.listeners[event].indexOf(listener);
    }

    /* Return false by default. */
    return false;
}

/* The function that removes a listener from a given element & its storage record. */
function removeListener (element, event, listener, options) {
    /* Use the element given to retrieve the record. */
    var record = findRecordByElement(element);

    /* Check whether any record was found and, if found, whether the event exists. */
    if (record && event in record.listeners) {
        /* Cache the index of the listener inside the event array. */
        var index = record.listeners[event].indexOf(listener);

        /* Check whether listener is not -1. */
        if (~index) {
            /* Delete the listener from the event array. */
            record.listeners[event].splice(index, 1);
        }

        /* Check whether the event array is empty or not. */
        if (!record.listeners[event].length) {
            /* Delete the event array. */
            delete record.listeners[event];
        }
    }

    /* Add the event listener to the element. */
    element.removeEventListener(event, listener, options);
}

window.onload = function () {
  var
    /* Cache the test element. */
    element = document.getElementById("test"),

    /* Create an event listener. */
    listener = function (e) {
      console.log(e.type + "triggered!");
    };

  /* Insert the listener to the element. */
  insertListener(element, "mouseover", listener);

  /* Log whether the listener exists. */
  console.log(listenerExists(element, "mouseover", listener));

  /* Remove the listener from the element. */
  removeListener(element, "mouseover", listener);

  /* Log whether the listener exists. */
  console.log(listenerExists(element, "mouseover", listener));
};

<script src = "https://cdn.rawgit.com/angelpolitis/custom-event-storage/master/main.js"></script>


<div id = "test" style = "background:#000; height:50px; width: 50px"></div>

getEventListeners(document.querySelector('your-element-selector'));

var eventHandlerType;

$('#contentDiv').on('click', clickEventHandler).triggerHandler('click');

function clickEventHandler(e) {
    eventHandlerType = e.type;
}

if (eventHandlerType === 'click') {
    console.log('EventHandler "click" has been applied');
}

var _addEventListener = EventTarget.prototype.addEventListener;
var _removeEventListener = EventTarget.prototype.removeEventListener;
EventTarget.prototype.events = {};
EventTarget.prototype.addEventListener = function(name, function, etc) {
   var events = EventTarget.prototype.events;
   if (events[name]==null) {
      events[name] = [];
   }

   if (events[name].indexOf(function)==-1) {
      events[name].push(function);
   }

   _addEventListener(name, function);
}
EventTarget.prototype.removeEventListener = function(name) {
   var events = EventTarget.prototype.events;

   if (events[name]!=null && events[name].indexOf(function)!=-1) {
      events[name].splice(events[name].indexOf(function), 1);
   }

   _removeEventListener(name, function);
}
EventTarget.prototype.hasEventListener = function(name) {
   var events = EventTarget.prototype.events;
   if (events[name]==null) {
      return false;
   }

   return events[name].length);
}

document.getElementById('link2').removeEventListener('click', linkclick, false);
document.getElementById('link2').addEventListener('click', linkclick, false);

var hasEvent,getEvents;!function(){function b(a,b,c){c?a.dataset.events+=","+b:a.dataset.events=a.dataset.events.replace(new RegExp(b),"")}function c(a,c){var d=EventTarget.prototype[a+"EventListener"];return function(a,e,f,g,h){this.dataset.events||(this.dataset.events="");var i=hasEvent(this,a);return c&&i||!c&&!i?(h&&h(),!1):(d.call(this,a,e,f),b(this,a,c),g&&g(),!0)}}hasEvent=function(a,b){var c=a.dataset.events;return c?new RegExp(b).test(c):!1},getEvents=function(a){return a.dataset.events.replace(/(^,+)|(,+$)/g,"").split(",").filter(function(a){return""!==a})},EventTarget.prototype.addEventListener=c("add",!0),EventTarget.prototype.removeEventListener=c("remove",!1)}();

var elems = document.querySelectorAll('*');

for (var i=0; i 

var listenerPresent=false

listenerPresent=true

accessFirstFunctionality=false
accessSecondFunctionality=true
accessThirdFunctionality=true

item.onclick

item.hasOwnProperty('onclick')