Register multiple "ESC" key handlers so hitting the escape key only does the most recently registered action. (requires jQuery)

register-esc.js

var escEvents = new Array();

// If something needs to listen for the "ESC" key to be pressed, pass that functionality here
// eventName        STRING      a name for this event, like "myPopupDialog"
// eventFunction    FUNCTION    what to do when the user hits the escape key
function setEscEvent(eventName, eventFunction){
    escEvents.push({ eventName: eventName, eventFunction: eventFunction });
}

// When an item doesn't need to listen for the "ESC" key anymore, remove it
// this is called automatically after escape is pressed, but if you no longer need to listen you can call it manually
// eventName    STRING  the name assigned to the event in setEscEvent()
function unsetEscEvent(eventName)
{
  $.each(escEvents, function (index, value) {
      console.log(value);
      if (value['eventName'] == eventName)
      {
          escEvents.splice(index);
      }
  });
}

// When the "ESC" key is pressed, do the most recent registered function
// then unset this listener since the event is over
function runEscEvent()
{
    var lastEvent = escEvents.length - 1;
    eval(escEvents[lastEvent].eventFunction());
    unsetEscEvent(escEvents[lastEvent].eventName);
}

// This is the listener for the escape key to be pressed
$(document).on( 'keyup', function ( event ){
    event.preventDefault();
    if (escEvents.length > 0 && event.keyCode === 27) {
        runEscEvent();
    }
} );

/* ************** */
// EXAMPLE USAGE:
function myPopup()
{
    // ... code to open the popup
  
    //if the user hits the escape key, close the popup
    setEscEvent('popup',function () { closePopup() });

    //if the user clicks the "close" button or anywhere outside the popup, close it.
    //if your event doesn't have another way to close it (and the user has to press ESC) then this is OPTIONAL
    $("#popup-close, #modal-background").on("click", function (e) {
        closePopup(); // run the function to close the popup
        unsetEscEvent('popup'); // manually unset the ESC key listener since we no longer need it
    });
}

function closePopup()
{ 
  // ...code to close the popup 
}