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Add custom icons with Markers

Add custom marker icons to your map.

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Add custom icons with Markers</title>
    <meta property="og:description" content="Add custom marker icons to your map." />
    <meta charset='utf-8'>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel='stylesheet' href='https://unpkg.com/[email protected]/dist/maplibre-gl.css' />
    <script src='https://unpkg.com/[email protected]/dist/maplibre-gl.js'></script>
    <style>
        body { margin: 0; padding: 0; }
        html, body, #map { height: 100%; }
    </style>
</head>
<body>
<style>
    .marker {
        display: block;
        border: none;
        border-radius: 50%;
        cursor: pointer;
        padding: 0;
    }
</style>

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

<script>
    const geojson = {
        'type': 'FeatureCollection',
        'features': [
            {
                'type': 'Feature',
                'properties': {
                    'message': 'Foo',
                    'iconSize': [60, 60]
                },
                'geometry': {
                    'type': 'Point',
                    'coordinates': [-66.324462890625, -16.024695711685304]
                }
            },
            {
                'type': 'Feature',
                'properties': {
                    'message': 'Bar',
                    'iconSize': [50, 50]
                },
                'geometry': {
                    'type': 'Point',
                    'coordinates': [-61.2158203125, -15.97189158092897]
                }
            },
            {
                'type': 'Feature',
                'properties': {
                    'message': 'Baz',
                    'iconSize': [40, 40]
                },
                'geometry': {
                    'type': 'Point',
                    'coordinates': [-63.29223632812499, -18.28151823530889]
                }
            }
        ]
    };

    const map = new maplibregl.Map({
        container: 'map',
        style:
            'https://api.maptiler.com/maps/streets/style.json?key=get_your_own_OpIi9ZULNHzrESv6T2vL',
        center: [-65.017, -16.457],
        zoom: 5
    });

    // add markers to map
    geojson.features.forEach((marker) => {
        // create a DOM element for the marker
        const el = document.createElement('div');
        el.className = 'marker';
        el.style.backgroundImage =
            `url(https://placekitten.com/g/${
                marker.properties.iconSize.join('/')
            }/)`;
        el.style.width = `${marker.properties.iconSize[0]}px`;
        el.style.height = `${marker.properties.iconSize[1]}px`;

        el.addEventListener('click', () => {
            window.alert(marker.properties.message);
        });

        // add marker to map
        new maplibregl.Marker({element: el})
            .setLngLat(marker.geometry.coordinates)
            .addTo(map);
    });
</script>
</body>
</html>