Add markers to a web map with a symbol layer
This example visualizes point features on a map using a symbol layer.
Upon loading, the map uses loadImage to add an image to the application, addSource to add a collection of points to the application, and then addLayer to draw the image and label on the map at each point location.
Supported File Types
Only .png, .jpg and .webp formats are supported when loading images into a style at runtime using map.loadImage(). Other file types like .svg are not supported.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Add markers to a web map with a symbol layer</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v3.10.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v3.10.0/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<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';
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',
bounds: [
[-128.99107, 22.62724],
[-63.35107, 50.26125]
]
});
map.on('load', () => {
// Add an image to use as a custom marker
map.loadImage(
'https://docs.mapbox.com/mapbox-gl-js/assets/custom_marker.png',
(error, image) => {
if (error) throw error;
map.addImage('custom-marker', image);
// Add a GeoJSON source with 2 points
map.addSource('points', {
'type': 'geojson',
'data': {
'type': 'FeatureCollection',
'features': [
{
// feature for Mapbox DC
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [
-77.03238901390978, 38.913188059745586
]
},
'properties': {
'title': 'Mapbox DC'
}
},
{
// feature for Mapbox SF
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [-122.414, 37.776]
},
'properties': {
'title': 'Mapbox SF'
}
}
]
}
});
// Add a symbol layer
map.addLayer({
'id': 'points',
'type': 'symbol',
'source': 'points',
'layout': {
'icon-image': 'custom-marker',
// get the title name from the source's "title" property
'text-field': ['get', 'title'],
'text-font': [
'Open Sans Semibold',
'Arial Unicode MS Bold'
],
'text-offset': [0, 1.25],
'text-anchor': 'top'
}
});
}
);
});
</script>
</body>
</html>
This code snippet will not work as expected until you replace
YOUR_MAPBOX_ACCESS_TOKEN with an access token from your Mapbox account.import React, { useEffect, useRef } from 'react';
import mapboxgl from 'mapbox-gl';
import 'mapbox-gl/dist/mapbox-gl.css';
const MapboxExample = () => {
const mapContainerRef = useRef();
const mapRef = useRef();
useEffect(() => {
// TO MAKE THE MAP APPEAR YOU MUST
// ADD YOUR ACCESS TOKEN FROM
// https://account.mapbox.com
mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
mapRef.current = new mapboxgl.Map({
container: mapContainerRef.current,
style: 'mapbox://styles/mapbox/streets-v12',
bounds: [
[-128.99107, 22.62724],
[-63.35107, 50.26125]
]
});
mapRef.current.on('load', () => {
mapRef.current.loadImage(
'https://docs.mapbox.com/mapbox-gl-js/assets/custom_marker.png',
(error, image) => {
if (error) throw error;
mapRef.current.addImage('custom-marker', image);
mapRef.current.addSource('points', {
type: 'geojson',
data: {
type: 'FeatureCollection',
features: [
{
type: 'Feature',
geometry: {
type: 'Point',
coordinates: [-77.03238901390978, 38.913188059745586]
},
properties: {
title: 'Mapbox DC'
}
},
{
type: 'Feature',
geometry: {
type: 'Point',
coordinates: [-122.414, 37.776]
},
properties: {
title: 'Mapbox SF'
}
}
]
}
});
mapRef.current.addLayer({
id: 'points',
type: 'symbol',
source: 'points',
layout: {
'icon-image': 'custom-marker',
'text-field': ['get', 'title'],
'text-font': ['Open Sans Semibold', 'Arial Unicode MS Bold'],
'text-offset': [0, 1.25],
'text-anchor': 'top'
}
});
}
);
});
}, []);
return <div id="map" style={{ height: '100%' }} ref={mapContainerRef}></div>;
};
export default MapboxExample;
This code snippet will not work as expected until you replace
YOUR_MAPBOX_ACCESS_TOKEN with an access token from your Mapbox account.EXAMPLE
Alternative Marker Technique
See Add a default marker to a web map for a less complex approach to visualizing point features using the Marker class.
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