Google Maps & JavaFX: Display marker on the map after clicking JavaFX button

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I have been trying to display a marker on the map when I click on a Button of my JavaFX application. So what happens is when I click on that button, I write the position in a JSON file, this file will be loaded in the html file that contains the map. The problem is that it works perfectly when I open the html page in the browser, but nothing happens in the JavaFX’s web view, and I don’t know why !

This is the html file:

<!DOCTYPE html>
<html>
  <head>
  <title>Simple Map</title>
  <meta name="viewport" content="initial-scale=1.0">
  <meta charset="utf-8">
  <style>
  /* Always set the map height explicitly to define the size of the div
   * element that contains the map. */
  /*#map {
    height: 100%;
  }*/
  #map{width:100%;height:100%;margin:auto;}
  /* Optional: Makes the sample page fill the window. */
  html, body {
    height: 100%;
    margin: 0;
    padding: 0;
  }
</style>
</head>
<body>
<div id="map"></div>
<script>
  var map;
  var marker;
  // Multiple Markers
  var markers = [];
  var pos = {lat: 46.662388, lng: 0.3599617};
  var itinerary_markers = [];

  function initMap() {

    var currentLat, currentLng;//Latitude et longtitude courante

    $.ajax({
      url: 'https://maps.googleapis.com/maps/api/geocode/json?address=My+ADDRESS&key=MY_KEY',
      async: false,
      dataType: 'json',
      success: function (data) {
        currentLat = data.results[0].geometry.location.lat;
        currentLng = data.results[0].geometry.location.lng;
      }
    });

    map = new google.maps.Map(document.getElementById('map'), {
      center: {lat: currentLat, lng: currentLng},
      zoom: 15,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    });


    /*MARQUEUR*/ 
    $.ajax({
        async: false,
        url: 'test.json',
        data: "",
        accepts:'application/json',
        dataType: 'json',
        success: function (data) {
            for (var i = 0; i < data.hydrants.length; i++) {
                markers.push( data.hydrants[i]);
            }
        }
    });

      var posi = new google.maps.LatLng(markers[0].Lat, markers[0].Lng);
      marker = new google.maps.Marker({
          position: posi,
          map: map,
          //title: markers[i][0]
          title: markers[0].Name
        });

  }
</script>

<script
    src="https://code.jquery.com/jquery-3.2.1.min.js"
    integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4="
    crossorigin="anonymous">
</script>


<script src="https://maps.googleapis.com/maps/api/js?key=MY_KEY&callback=initMap&language=fr"
async defer></script>

</body>
</html>

When I click the button, I fill the JSON file (which works perfectly) and then I execute this to refresh the webview:

this.webView.getEngine().load(getClass().getResource("/data/index.html").toString());

As I said before, when I open the file on the browser I see the expected result, but I don’t know what is the problem with the JavaFX.
If there is a better way to do this please tell me.

EDIT:

I found a solution to the problem by sending directly the data (the GPS coordinates) from JavaFX to Javascript using the executeScript() method, so I don’t need a json file as bridge between the two platforms.
So this is an example of how the code looks like:

eng.executeScript("updateMarker(" + lat + ", " + lng + ")");//eng is a WebEngine instance

And here is the Javascript:

/*The initial latitude and longtitude*/
var currentLat = the latitude;
var currentLng = the longtitude;

function initMap() {

    map = new google.maps.Map(document.getElementById('map'), {
      center: {lat: currentLat, lng: currentLng},
      zoom: 15,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    });

    var posi = new google.maps.LatLng(currentLat, currentLng);
    marker = new google.maps.Marker({
        position: posi,
        map: map,
        visible: false
    });
  }

/*The method that is I call from JavaFX*/
function updateMarker(_lat, _lng){
    marker.setPosition({lat: _lat, lng: _lng});
    map.setCenter(new google.maps.LatLng(_lat, _lng));
    marker.setVisible(true);
  }

Thank you for your comments and answers, and a special shootout to reddit.

3 Answers
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