Style lines with a data-driven property
Create a visualization with a data expression for line-color.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Style lines with a data-driven property</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v3.9.1/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v3.9.1/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',
center: [-122.4838, 37.8288],
zoom: 16
});
map.on('load', () => {
map.addSource('lines', {
'type': 'geojson',
'data': {
'type': 'FeatureCollection',
'features': [
{
'type': 'Feature',
'properties': {
'color': '#F7455D' // red
},
'geometry': {
'type': 'LineString',
'coordinates': [
[-122.4833858013153, 37.829607404976734],
[-122.4830961227417, 37.82932776098012],
[-122.4830746650696, 37.82932776098012],
[-122.48218417167662, 37.82889558180985],
[-122.48218417167662, 37.82890193740421],
[-122.48221099376678, 37.82868372835086],
[-122.4822163581848, 37.82868372835086],
[-122.48205006122589, 37.82801003030873]
]
}
},
{
'type': 'Feature',
'properties': {
'color': '#33C9EB' // blue
},
'geometry': {
'type': 'LineString',
'coordinates': [
[-122.48393028974533, 37.829471820141016],
[-122.48395174741744, 37.82940826466351],
[-122.48395174741744, 37.829412501697064],
[-122.48423874378203, 37.829357420242125],
[-122.48422533273697, 37.829361657278575],
[-122.48459815979002, 37.8293425906126],
[-122.48458743095398, 37.8293447091313],
[-122.4847564101219, 37.82932776098012],
[-122.48474299907684, 37.829331998018276],
[-122.4849334359169, 37.829298101706186],
[-122.48492807149889, 37.82930022022615],
[-122.48509705066681, 37.82920488676767],
[-122.48509168624878, 37.82920912381288],
[-122.48520433902739, 37.82905870855876],
[-122.48519897460936, 37.82905870855876],
[-122.4854403734207, 37.828594749716714],
[-122.48543500900269, 37.82860534241688],
[-122.48571664094925, 37.82808206121068],
[-122.48570591211319, 37.82809689109353],
[-122.4858346581459, 37.82797189627337],
[-122.48582661151886, 37.82797825194729],
[-122.4859634041786, 37.82788503534145],
[-122.48595803976059, 37.82788927246246],
[-122.48605459928514, 37.82786596829394]
]
}
}
]
}
});
map.addLayer({
'id': 'lines',
'type': 'line',
'source': 'lines',
'paint': {
'line-width': 3,
// Use a get expression (https://docs.mapbox.comhttps://docs.mapbox.com/style-spec/reference/expressions/#get)
// to set the line-color to a feature property value.
'line-color': ['get', 'color']
}
});
});
</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',
center: [-122.4838, 37.8288],
zoom: 16
});
mapRef.current.on('load', () => {
mapRef.current.addSource('lines', {
type: 'geojson',
data: {
type: 'FeatureCollection',
features: [
{
type: 'Feature',
properties: {
color: '#F7455D' // red
},
geometry: {
type: 'LineString',
coordinates: [
[-122.4833858013153, 37.829607404976734],
[-122.4830961227417, 37.82932776098012],
[-122.4830746650696, 37.82932776098012],
[-122.48218417167662, 37.82889558180985],
[-122.48218417167662, 37.82890193740421],
[-122.48221099376678, 37.82868372835086],
[-122.4822163581848, 37.82868372835086],
[-122.48205006122589, 37.82801003030873]
]
}
},
{
type: 'Feature',
properties: {
color: '#33C9EB' // blue
},
geometry: {
type: 'LineString',
coordinates: [
[-122.48393028974533, 37.829471820141016],
[-122.48395174741744, 37.82940826466351],
[-122.48395174741744, 37.829412501697064],
[-122.48423874378203, 37.829357420242125],
[-122.48422533273697, 37.829361657278575],
[-122.48459815979002, 37.8293425906126],
[-122.48458743095398, 37.8293447091313],
[-122.4847564101219, 37.82932776098012],
[-122.48474299907684, 37.829331998018276],
[-122.4849334359169, 37.829298101706186],
[-122.48492807149889, 37.82930022022615],
[-122.48509705066681, 37.82920488676767],
[-122.48509168624878, 37.82920912381288],
[-122.48520433902739, 37.82905870855876],
[-122.48519897460936, 37.82905870855876],
[-122.4854403734207, 37.828594749716714],
[-122.48543500900269, 37.82860534241688],
[-122.48571664094925, 37.82808206121068],
[-122.48570591211319, 37.82809689109353],
[-122.4858346581459, 37.82797189627337],
[-122.48582661151886, 37.82797825194729],
[-122.4859634041786, 37.82788503534145],
[-122.48595803976059, 37.82788927246246],
[-122.48605459928514, 37.82786596829394]
]
}
}
]
}
});
mapRef.current.addLayer({
id: 'lines',
type: 'line',
source: 'lines',
paint: {
'line-width': 3,
'line-color': ['get', 'color']
}
});
});
}, []);
return <div ref={mapContainerRef} id="map" style={{ height: '100%' }} />;
};
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.Was this example helpful?