MapLibreMapLibre GL JS DocsExamplesShow polygon information on click

Show polygon information on click

When a user clicks a polygon, show a Popup containing more information.

<!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" />
<script src="https://unpkg.com/[email protected]/dist/maplibre-gl.js"></script>
<link href="https://unpkg.com/[email protected]/dist/maplibre-gl.css" rel="stylesheet" />
<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>
var map = new maplibregl.Map({
container: 'map',
style:
'https://api.maptiler.com/maps/streets/style.json?key=get_your_own_OpIi9ZULNHzrESv6T2vL',
center: [-100.04, 38.907],
zoom: 3
});
map.on('load', function () {
// Add a source for the state polygons.
map.addSource('states', {
'type': 'geojson',
'data':
'https://d2ad6b4ur7yvpq.cloudfront.net/naturalearth-3.3.0/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 its properties.
map.on('click', 'states-layer', function (e) {
new maplibregl.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', function () {
map.getCanvas().style.cursor = 'pointer';
});
// Change it back to a pointer when it leaves.
map.on('mouseleave', 'states-layer', function () {
map.getCanvas().style.cursor = '';
});
});
</script>
</body>
</html>