Fit a map to a bounding box | Mapbox GL JS

This example zooms and pans the map so the new visible area of the map fits within the specified geographical bounds.

It uses the JavaScript addEventListener method to attach a click listener to the 'Fit to Kenya' button so that when a user clicks the button, fitBounds() pans and zooms the map viewport from the starting location on the city of Mombasa so that the new visible area includes the entire country of Kenya.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Fit a map to a bounding box</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v2.14.1/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v2.14.1/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<style>
#fit {
display: block;
position: relative;
margin: 0px auto;
width: 50%;
height: 40px;
padding: 10px;
border: none;
border-radius: 3px;
font-size: 12px;
text-align: center;
color: #fff;
background: #ee8a65;
}
</style>
<div id="map"></div>
<br>
<button id="fit">Fit to Kenya</button>
<script>
	// TO MAKE THE MAP APPEAR YOU MUST
	// ADD YOUR ACCESS TOKEN FROM
	// https://account.mapbox.com
	mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
const map = new mapboxgl.Map({
container: 'map', // container ID
// Choose from Mapbox's core styles, or make your own style with Mapbox Studio
style: 'mapbox://styles/mapbox/streets-v12', // style URL
center: [39.657325, -4.024902], // starting position ([lng, lat] for Mombasa, Kenya)
zoom: 9 // starting zoom
});
 
/*
*  When a user clicks the button, `fitBounds()` zooms and pans
*  the viewport to contain a bounding box that surrounds Kenya.
*  The [lng, lat] pairs are the southwestern and northeastern
*  corners of the specified geographical bounds.
*/
document.getElementById('fit').addEventListener('click', () => {
map.fitBounds([
[32.958984, -5.353521], // southwestern corner of the bounds
[43.50585, 5.615985] // northeastern corner of the bounds
]);
});
</script>
 
</body>
</html>