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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              <div id="toolbox">
  <fieldset>
    <legend>Add Event</legend>
    <select id="eventlist">
      <option value="click">Click</option>
      <option value="focusin">Focus In</option>
      <option value="focusout">Focus Out</option>
      <option value="mouseover">Mouse Over</option>
    </select>
    <button id="addevent" onclick="addEvent();">Add Event</button>
  </fieldset>
  <fieldset>
    <legend>Remove Event</legend>
    <select id="activeeventlist">

    </select>
    <button id="removeevent" onclick="removeEvent();">Remove Event</button>
  </fieldset>
</div>

<button id="test"> Test Button </button>
<div id="eventlog">
  <h3>Action Log</h3>
</div>
            
          
!

CSS

            
              div#toolbox{
  width:250px;
  float:right;
  background-color:lightgreen;
}
            
          
!

JS

            
              var eventHandler = {
  events: [], //Array of events the element is subscribed to.

  bindEvent: function(event, callback, targetElement) {
    //remove any duplicate event 
    this.unbindEvent(event, targetElement);

    //bind event listener to DOM element
    targetElement.addEventListener(event, callback, false);

    this.events.push({
      type: event,
      event: callback,
      target: targetElement
    }); //push the new event into our events array.
  },

  findEvent: function(event) {
    return this.events.filter(function(evt) {
      return (evt.type === event); //if event type is a match return
    }, event)[0];
  },
  unbindEvent: function(event, targetElement) {
    //search events
    var foundEvent = this.findEvent(event);

    //remove event listener if found
    if (foundEvent !== undefined) {
      targetElement.removeEventListener(event, foundEvent.event, false);
    }

    //update the events array
    this.events = this.events.filter(function(evt) {
      return (evt.type !== event);
    }, event);
  }
};

var testBtn = document.getElementById('test');
var log = document.getElementById('eventlog');

function logMsg(e) {
  if (e.type !== undefined) {
    log.innerHTML = log.innerHTML + '<br> Event triggered: ' + e.type;
  }
}

function addEvent() {
  var list = document.getElementById("eventlist");
  var selected = list.options[list.selectedIndex].value;
  eventHandler.bindEvent(selected, logMsg, document.getElementById('test'));
  activeList();
}

function activeList() {
  var list = document.getElementById('activeeventlist');
  list.innerHTML = '';
  eventHandler.events.forEach(function(e) {
    var opt = document.createElement('option');
    opt.setAttribute('value', e.type);
    opt.innerHTML = e.type;
    list.appendChild(opt);
  });
}

function removeEvent() {
  var list = document.getElementById("activeeventlist");
  var selected = list.options[list.selectedIndex].value;
  eventHandler.unbindEvent(selected, document.getElementById('test'));
  activeList();
}
            
          
!
999px

Console