HTML5 Canvas: Move object to any clicked objects?

I want to add a  a highlight to indicate the last object clicked  without adding this to every object click:

this.Marker.y = this.navButton1.y;
this.Marker.x = this.navButton1.x;

According to Google AI this should do the trick: 

// Set the initial position of the object to move
var objectToMove = this;
objectToMove.x = 100;
objectToMove.y = 100;

// Add a click event listener to the target object
stage.addEventListener("click", handleTargetClick);

function handleTargetClick(event) {
  // Get the clicked object
  var target = event.target;

  // Make sure the clicked object is not the objectToMove
  if (target != objectToMove) {
    // Get the position of the target object
    var targetX = target.x;
    var targetY = target.y;

    // Set the objectToMove to the position of the target object
    objectToMove.x = targetX;
    objectToMove.y = targetY;

  }
}

So I added handleTargetClick(); to the click function for my navigation objects, altering the code above to indicate my Marker object: var objectToMove = this.Marker ;  but I get the error:

Uncaught TypeError: Cannot read properties of undefined (reading 'target')

var target = event.target;

Shouldn't that code make the clicked object the target, to align the Marker to?

Any helpful hints welcome, thanks!