Click event on the marker does not perform all functions

This is my code:

google.maps.event.addListener(marker, ‘click’, () => {
infoWindow.open(this.map, marker);

  console.log(marker.getPosition().lat()); //this works

  marker.draggable = true; //this doesnt work

  this.showBtAlter = true; //this doesn't work.  Should show a button on the screen, it works in other places.

});