Google Maps & JavaFX: Display marker on the map after clicking JavaFX button
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.
Answer
If I had to guess - one of two things is happening:
Either A) your javaFX is not supporting cross site ajax calls or B) it is not waiting for the asynchronous ajax response/something else is going wrong.
So let's do some testing together. Firstly can we clean this up to nest the ajax calls? Then can you add in some console.log statements to find out what each is sending back? If you miss some output we know where it's going wrong and that'll help us fix things.
Note I've changed success to the 'done' additions because success is a bit out of date, and everything is nested to eliminate the question around whether any blanks are being sent in to the next calls (synchronicity issues):
$.ajax({
url: 'https://maps.googleapis.com/maps/api/geocode/json?address=My+ADDRESS&key=MY_KEY',
async: false,
dataType: 'json'
}).done(function(data) {
currentLat = data.results[0].geometry.location.lat;
currentLng = data.results[0].geometry.location.lng;
console.log(currentLat);
console.log(currentLng);
// Multiple Markers
var markers = [];
var pos = {lat: 46.662388, lng: 0.3599617};
var itinerary_markers = [];
var map = new google.maps.Map(document.getElementById('map'), {
center: {lat: currentLat, lng: currentLng},
zoom: 15,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
console.log(map);
/*MARQUEUR*/
$.ajax({
async: false,
url: 'test.json',
data: "",
accepts:'application/json',
dataType: 'json'
}).done(function(data) {
for (var i = 0; i < data.hydrants.length; i++) {
markers.push( data.hydrants[i]);
}
console.log(markers);
var posi = new google.maps.LatLng(markers[0].Lat, markers[0].Lng);
console.log(posi);
var marker = new google.maps.Marker({
position: posi,
map: map,
//title: markers[i][0]
title: markers[0].Name
});
console.log(marker);
}).fail(function(jqXHR, testStatus){
console.log(textStatus);
});
}).fail(function(jqXHR, testStatus){
console.log(textStatus);
});
Here is a link on getting the console.log output in to System.out in Java if this is an issue: JavaFX 8 WebEngine: How to get console.log() from javascript to System.out in java?
...Also hello from reddit.