Update a Feature in Realtime

Update a GeoJSON feature’s position in real time by calling setData on a source.

const API_KEY = 'toursprung';

    const map = new maptoolkit.Map({
        container: 'map',
        style: `https://static.maptoolkit.net/styles/toursprung/terrain.json?api_key=${API_KEY}`,
        center: [12.0, 47.5],
        zoom: 7,
        attributionControl: { compact: false }
    });

    map.addControl(new maptoolkit.NavigationControl(), 'top-right');

    const cities = [
        [11.39085, 47.27574],
        [13.0550, 47.8095],
        [16.3738, 48.2082],
        [15.4395, 47.0707],
        [11.576, 48.1374],
        [8.5417, 47.3769]
    ];

    let cityIndex = 0;
    const dot = {
        type: 'Feature',
        geometry: { type: 'Point', coordinates: cities[0] }
    };

    map.on('load', () => {
        map.addSource('dot', { type: 'geojson', data: dot });

        map.addLayer({
            id: 'dot',
            type: 'circle',
            source: 'dot',
            paint: { 'circle-radius': 14, 'circle-color': '#ee8a65', 'circle-stroke-width': 2, 'circle-stroke-color': '#fff' }
        });

        setInterval(() => {
            cityIndex = (cityIndex + 1) % cities.length;
            dot.geometry.coordinates = cities[cityIndex];
            map.getSource('dot').setData(dot);
        }, 1500);
    });

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Update a Feature in Realtime – Maptoolkit Maps JS</title>
    <meta property="og:description" content="Update a GeoJSON feature's position in real time by calling setData on a source." />
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <script src="https://unpkg.com/@maptoolkit/maps@11.0.0-beta.2/dist/maptoolkit.js"></script>
    <link rel="stylesheet" href="https://unpkg.com/@maptoolkit/maps@11.0.0-beta.2/dist/maptoolkit.css" />
    <style>
        html, body { width: 100%; height: 100%; margin: 0; padding: 0; }
        #map { width: 100%; height: 100%; }
    </style>
</head>
<body>
<div id="map"></div>
<script>
    const API_KEY = 'toursprung';

    const map = new maptoolkit.Map({
        container: 'map',
        style: `https://static.maptoolkit.net/styles/toursprung/terrain.json?api_key=${API_KEY}`,
        center: [12.0, 47.5],
        zoom: 7,
        attributionControl: { compact: false }
    });

    map.addControl(new maptoolkit.NavigationControl(), 'top-right');

    const cities = [
        [11.39085, 47.27574],
        [13.0550, 47.8095],
        [16.3738, 48.2082],
        [15.4395, 47.0707],
        [11.576, 48.1374],
        [8.5417, 47.3769]
    ];

    let cityIndex = 0;
    const dot = {
        type: 'Feature',
        geometry: { type: 'Point', coordinates: cities[0] }
    };

    map.on('load', () => {
        map.addSource('dot', { type: 'geojson', data: dot });

        map.addLayer({
            id: 'dot',
            type: 'circle',
            source: 'dot',
            paint: { 'circle-radius': 14, 'circle-color': '#ee8a65', 'circle-stroke-width': 2, 'circle-stroke-color': '#fff' }
        });

        setInterval(() => {
            cityIndex = (cityIndex + 1) % cities.length;
            dot.geometry.coordinates = cities[cityIndex];
            map.getSource('dot').setData(dot);
        }, 1500);
    });
</script>
</body>
</html>

Style Lines with a Data-Driven Property