Display a popup on hover | Goong Documents

When a user hovers over a custom marker, show a Popup containing more information.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Display a popup on hover</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>
<style>
.goongjs-popup {
max-width: 400px;
font: 12px/20px 'Helvetica Neue', Arial, Helvetica, sans-serif;
}
</style>
<div id="map"></div>
<script>
goongjs.accessToken = '8qzxZAuxcsctSlmOszInchP1A5GrmRBHJwCBCjO6';
var map = new goongjs.Map({
container: 'map',
style: 'https://tiles.goong.io/assets/goong_map_web.json',
center: [105.8344898123422, 21.03677130693113],
zoom: 13
});
 
map.on('load', function () {
map.loadImage(
'https://docs.goong.io/assets/custom_marker.png',
// Add an image to use as a custom marker
function (error, image) {
if (error) throw error;
map.addImage('custom-marker', image);
 
map.addSource('places', {
'type': 'geojson',
'data': {
'type': 'FeatureCollection',
'features': [
{
'type': 'Feature',
'properties': {
'description':
'The President Ho Chi Minh Mausoleum is a mausoleum which serves as the resting place of Vietnamese Revolutionary leader & President Ho Chi Minh in Hanoi, Vietnam.'
},
'geometry': {
'type': 'Point',
'coordinates': [
105.8344898123422, 21.03677130693113
]
}
}
]
}
});
 
// Add a layer showing the places.
map.addLayer({
'id': 'places',
'type': 'symbol',
'source': 'places',
'layout': {
'icon-image': 'custom-marker',
'icon-allow-overlap': true
}
});
}
);
 
// Create a popup, but don't add it to the map yet.
var popup = new goongjs.Popup({
closeButton: false,
closeOnClick: false
});
 
map.on('mouseenter', 'places', function (e) {
// Change the cursor style as a UI indicator.
map.getCanvas().style.cursor = 'pointer';
 
var coordinates = e.features[0].geometry.coordinates.slice();
var description = e.features[0].properties.description;
 
// Ensure that if the map is zoomed out such that multiple
// copies of the feature are visible, the popup appears
// over the copy being pointed to.
while (Math.abs(e.lngLat.lng - coordinates[0]) > 180) {
coordinates[0] += e.lngLat.lng > coordinates[0] ? 360 : -360;
}
 
// Populate the popup and set its coordinates
// based on the feature found.
popup.setLngLat(coordinates).setHTML(description).addTo(map);
});
 
map.on('mouseleave', 'places', function () {
map.getCanvas().style.cursor = '';
popup.remove();
});
});
</script>
 
</body>
</html>