Show polygon information on click | Mapbox GL JS

In this example, when a user clicks a polygon in a specified layer, the map shows a popup containing information about the clicked feature.

When the map loads, it uses addSource and addLayer to add and style a layer called states-layer, which contains state polygons.

When the user clicks a feature in the states-layer layer, the example uses the Popup method to create a new popup, using MapMouseEvent data to set the position and content of the popup.

Lastly, it uses the Map events mouseenter and mouseleave to toggle the user's cursor to a pointer while it hovers over any feature in states-layer.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Show polygon information on click</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v3.2.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v3.2.0/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<style>
    .mapboxgl-popup {
        max-width: 400px;
        font:
            12px/20px 'Helvetica Neue',
            Arial,
            Helvetica,
            sans-serif;
    }
</style>
<div id="map"></div>
<script>
	// TO MAKE THE MAP APPEAR YOU MUST
	// ADD YOUR ACCESS TOKEN FROM
	// https://account.mapbox.com
	mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
    // Create a new map.
    const map = new mapboxgl.Map({
        container: 'map',
        // Choose from Mapbox's core styles, or make your own style with Mapbox Studio
        style: 'mapbox://styles/mapbox/streets-v12',
        center: [-100.04, 38.907],
        zoom: 3
    });

    map.on('load', () => {
        // Add a source for the state polygons.
        map.addSource('states', {
            'type': 'geojson',
            'data': 'https://docs.mapbox.com/mapbox-gl-js/assets/ne_110m_admin_1_states_provinces_shp.geojson'
        });

        // Add a layer showing the state polygons.
        map.addLayer({
            'id': 'states-layer',
            'type': 'fill',
            'source': 'states',
            'paint': {
                'fill-color': 'rgba(200, 100, 240, 0.4)',
                'fill-outline-color': 'rgba(200, 100, 240, 1)'
            }
        });

        // When a click event occurs on a feature in the states layer,
        // open a popup at the location of the click, with description
        // HTML from the click event's properties.
        map.on('click', 'states-layer', (e) => {
            new mapboxgl.Popup()
                .setLngLat(e.lngLat)
                .setHTML(e.features[0].properties.name)
                .addTo(map);
        });

        // Change the cursor to a pointer when
        // the mouse is over the states layer.
        map.on('mouseenter', 'states-layer', () => {
            map.getCanvas().style.cursor = 'pointer';
        });

        // Change the cursor back to a pointer
        // when it leaves the states layer.
        map.on('mouseleave', 'states-layer', () => {
            map.getCanvas().style.cursor = '';
        });
    });
</script>

</body>
</html>

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