Style Specification

Examples

Add an animated icon to the map Add a generated icon to the map Generate and add a missing icon to the map Add an icon to the map Display a map with a custom style Render world copies Display a satellite map Change a map's style Display a map

Display buildings in 3D Extrude polygons for 3D indoor mapping Add a 3D model Adjust a layer's opacity Animate a line Animate a series of images Animate a point Change building color based on zoom level Change the case of labels Display HTML clusters with custom properties Create and style clusters Change a layer's color with buttons Add a custom style layer Style circles with a data-driven property Style lines with a data-driven property Display and style rich text labels Use a fallback image Add a pattern to a polygon Add a new layer below labels Add a GeoJSON line Draw GeoJSON points Add a GeoJSON polygon Create a heatmap layer Create a gradient line using an expression Add multiple geometries from one GeoJSON source Style ocean depth data Show and hide layers Change worldview of administrative boundaries Update a choropleth layer by zoom level Variable label placement Visualize population density Add hillshading

Join local JSON data with vector tile geometries Add an image Add live realtime data Update a feature in realtime Add a raster tile source Add a third party vector tile source Add a vector tile source Add a video Add a WMS source

User interaction (20)

Animate 3D buildings based on ambient sounds Disable map rotation Create a draggable Marker Create a draggable point Filter features within map view Filter symbols by text input Filter symbols by toggling a list Create a hover effect Display a non-interactive map Change a map's language Measure distances Get coordinates of the mouse pointer Highlight features containing similar data Select features around a clicked point Get features under the mouse pointer Restrict map panning to an area Create a time slider Toggle interactions Highlight features within a bounding box Fit to the bounds of a LineString

Animate map camera around a point Animate a point along a route Center the map on a clicked symbol Fit a map to a bounding box Slowly fly to a location Fly to a location Navigate the map with game-like controls Jump to a series of locations Play map locations as a slideshow Fly to a location based on scroll position Set pitch and bearing

Controls and overlays (17)

Animate a marker Change the default position for attribution Add custom icons with Markers Disable scroll zoom View a fullscreen map Locate the user Swipe between maps Display driving directions Show drawn polygon area Add a geocoder Add a marker using a place name Display map navigation controls Show polygon information on click Display a popup on click Display a popup on hover Display a popup Attach a popup to a marker instance

Supplement forward geocoding search results from another data source Accept coordinates as input to a geocoder Use a custom render function with a geocoder Limit geocoder results to a named region Place the geocoder input outside the map Use a custom camera animation with a geocoder Localize the geocoder to a given language Set a point after Geocoder result

Browser support (1)

Check for browser support

Internationalization support (2)

Use locally generated ideographs Add support for right-to-left scripts

Show drawn polygon area

Use mapbox-gl-draw to draw a polygon and Turf.js to calculate its area in square meters.

<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title>Show drawn polygon area</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v1.5.0/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v1.5.0/mapbox-gl.css' rel='stylesheet' />
<style>
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
 
<style>
.calculation-box {
height: 75px;
width: 150px;
position: absolute;
bottom: 40px;
left: 10px;
background-color: rgba(255, 255, 255, .9);
padding: 15px;
text-align: center;
}
 
p {
font-family: 'Open Sans';
margin: 0;
font-size: 13px;
}
</style>
 
<script src='https://api.tiles.mapbox.com/mapbox.js/plugins/turf/v3.0.11/turf.min.js'></script>
<script src='https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-draw/v1.0.9/mapbox-gl-draw.js'></script>
<link rel='stylesheet' href='https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-draw/v1.0.9/mapbox-gl-draw.css' type='text/css'/>
<div id='map'></div>
<div class='calculation-box'>
<p>Draw a polygon using the draw tools.</p>
<div id='calculated-area'></div>
</div>
 
<script>
mapboxgl.accessToken = '<your access token here>';
var map = new mapboxgl.Map({
container: 'map', // container id
style: 'mapbox://styles/mapbox/satellite-v9', //hosted style id
center: [-91.874, 42.760], // starting position
zoom: 12 // starting zoom
});
 
var draw = new MapboxDraw({
displayControlsDefault: false,
controls: {
polygon: true,
trash: true
}
});
map.addControl(draw);
 
map.on('draw.create', updateArea);
map.on('draw.delete', updateArea);
map.on('draw.update', updateArea);
 
function updateArea(e) {
var data = draw.getAll();
var answer = document.getElementById('calculated-area');
if (data.features.length > 0) {
var area = turf.area(data);
// restrict to area to 2 decimal points
var rounded_area = Math.round(area*100)/100;
answer.innerHTML = '<p><strong>' + rounded_area + '</strong></p><p>square meters</p>';
} else {
answer.innerHTML = '';
if (e.type !== 'draw.delete') alert("Use the draw tools to draw a polygon!");
}
}
 
</script>
 
</body>
</html>

Was this example helpful?