live-geojson | Goong Documents

Use realtime GeoJSON data streams to move a symbol on your map.
Add live realtime data

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Add live realtime data</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://cdn.jsdelivr.net/npm/@goongmaps/goong-js@1.0.9/dist/goong-js.js"></script>
<link href="https://cdn.jsdelivr.net/npm/@goongmaps/goong-js@1.0.9/dist/goong-js.css" rel="stylesheet" />
<style>
	body { margin: 0; padding: 0; }
    #map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>

<div id="map"></div>

<script>
    goongjs.accessToken = 'wnicbAmnNkoMHNYUKWnlFHezV189FjmMwkNJ7hKW';
    var map = new goongjs.Map({
        container: 'map',
        style: 'https://tiles.goong.io/assets/goong_map_web.json',
        zoom: 5,
        center: [105, 21]
    });

    var url = 'https://wanderdrone.appspot.com/';
    map.on('load', function () {
        var request = new XMLHttpRequest();
        window.setInterval(function () {
            // make a GET request to parse the GeoJSON at the url
            request.open('GET', url, true);
            request.onload = function () {
                if (this.status >= 200 && this.status < 400) {
                    // retrieve the JSON from the response
                    var json = JSON.parse(this.response);

                    // update the drone symbol's location on the map
                    map.getSource('drone').setData(json);

                    // fly the map to the drone's current location
                    map.flyTo({
                        center: json.geometry.coordinates,
                        speed: 0.5
                    });
                }
            };
            request.send();
        }, 2000);

        map.addSource('drone', { type: 'geojson', data: url });
        map.addLayer({
            'id': 'drone',
            'type': 'symbol',
            'source': 'drone',
            'layout': {
                'icon-image': 'rocket-15'
            }
        });
    });
</script>
</body>
</html>