Scriptcase google map control

var marker;
// Initial coordinates from the parent form
var thelon;
var thelat;
// New coordinates given from the map or disrectly from the input coordinate fields
var newlon;
var newlat;
window.map = undefined;      // global variable
function scDisplayUserError(errorMessage) {
	alert("ERROR\r\n" + errorMessage.replace(/<br \/>/gi, "\n"));
}
function scDisplayUserDebug(debugMessage) {
	alert("DEBUG\r\n" + debugMessage.replace(/<br \/>/gi, "\n"));
}function scDisplayUserMessage(userMessage) {
	alert("MESSAGE\r\n" + userMessage.replace(/<br \/>/gi, "\n"));
}
// This will reset the coordinates to the initial values. This is an alternative to reexamine the initial position of the point without closing and reopening the control
function resetPoint() {
	// Set the values of the coordinates from the parent form
	thelon=parseFloat(parent.document.getElementById("id_sc_field_londd_manual").value);
	thelat=parseFloat(parent.document.getElementById("id_sc_field_latdd_manual").value);
	// Assign the values to the respective input fields of the iframe control form
    document.getElementById("id_sc_field_londd").value=thelon;
	document.getElementById("id_sc_field_latdd").value=thelat;
	// Reset the center of the map and the marker position
  	const center = new google.maps.LatLng(thelat, thelon);  
  	window.map.panTo(center);
  	marker.setPosition( new google.maps.LatLng( thelat, thelon ) );
  
}

function initMap() {
  // Set initial coordinates values from parent form
  thelon = parseFloat(parent.document.getElementById("id_sc_field_londd_manual").value);
  thelat = parseFloat(parent.document.getElementById("id_sc_field_latdd_manual").value);
  document.getElementById('id_sc_field_londd').value = thelon;
  document.getElementById('id_sc_field_latdd').value = thelat;	    
  var myLatLng = {lat: thelat, lng: thelon};
	// Starting parameters for the map by setting a default zoom and centering at the location of the marker	
  window.map = new google.maps.Map(document.getElementById('map'), {
    zoom: 11,
    center: myLatLng
  });
  pointLatLng = new google.maps.LatLng({lat: thelat, lng: thelon}); 
  
  marker = new google.maps.Marker({
    position: myLatLng,
    map: map,
    position: pointLatLng,
    draggable: true,
    title: 'Custom point'
  });
  <!-- Move the marker by dragging it -->
  marker.addListener('dragend', function(evt) {
    console.log('Lat: ' + evt.latLng.lat() + ' Lon: ' + evt.latLng.lng());
    newlon=parseFloat((Math.round(evt.latLng.lng() * 10000000) / 10000000).toFixed(7));
    newlat=parseFloat((Math.round(evt.latLng.lat() * 10000000) / 10000000).toFixed(7));
    document.getElementById('id_sc_field_londd').value = newlon;
    document.getElementById('id_sc_field_latdd').value = newlat;
	
  });
  <!-- On single click move the marker -->
  google.maps.event.addListener(map, 'click', function(evt) {       
    newlon=parseFloat((Math.round(evt.latLng.lng() * 10000000) / 10000000).toFixed(7));
    newlat=parseFloat((Math.round(evt.latLng.lat() * 10000000) / 10000000).toFixed(7));
	const center = new google.maps.LatLng(newlat, newlon);  
  	window.map.panTo(center);
  	marker.setPosition( new google.maps.LatLng( newlat, newlon ) );	
    document.getElementById('id_sc_field_londd').value = newlon;
    document.getElementById('id_sc_field_latdd').value = newlat;	
  });
  
}

$(document).ready(function () {
  $('#closewindow').click(function (){          
	$('#TB_overlay', window.parent.document).remove();    
    $('#TB_window', window.parent.document).remove();      
  });  
  
});
function exitModal() {		
	parent.document.getElementById('id_sc_field_londd_manual').value = newlon;
    parent.document.getElementById('id_sc_field_latdd_manual').value = newlat;
  	$('#TB_overlay', window.parent.document).remove();    
    $('#TB_window', window.parent.document).remove();      
  	
}
// Ajax executed function on coordinate fields change
function coordinatesChanged(thelon,thelat) {	
	newlon=thelon;
	newlat=thelat;
    document.getElementById("id_sc_field_londd").value=thelon;
	document.getElementById("id_sc_field_latdd").value=thelat;
  	const center = new google.maps.LatLng(thelat, thelon);  
  	window.map.panTo(center);
  	marker.setPosition( new google.maps.LatLng( thelat, thelon ) );
  
}