Draw GeoJSON points | TrackAsia GL JS Docs

Draw points from a GeoJSON collection to a map.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Draw GeoJSON points</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://unpkg.com/trackasia-gl@1.0.5/dist/trackasia-gl.js"></script>
<link href="https://unpkg.com/trackasia-gl@1.0.5/dist/trackasia-gl.css" rel="stylesheet" />
<style>
	body { margin: 0; padding: 0; }
	#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<div id="map"></div>
<script>
var map = new trackasiagl.Map({
container: 'map',
style: 'https://maps.track-asia.com/styles/v1/streets.json?key=public_key',
center: [0, 0],
zoom: 1
});
 
map.on('load', function () {
// Add an image to use as a custom marker
map.loadImage(
'https://docs.track-asia.com/assets/osgeo-logo.png',
function (error, image) {
if (error) throw error;
map.addImage('custom-marker', image);
// Add a GeoJSON source with 15 points
map.addSource('conferences', {
'type': 'geojson',
'data': {
'type': 'FeatureCollection',
'features': [
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [100.4933, 13.7551]
},
'properties': { 'year': '2004' }
},
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [6.6523, 46.5535]
},
'properties': { 'year': '2006' }
},
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [-123.3596, 48.4268]
},
'properties': { 'year': '2007' }
},
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [18.4264, -33.9224]
},
'properties': { 'year': '2008' }
},
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [151.195, -33.8552]
},
'properties': { 'year': '2009' }
},
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [2.1404, 41.3925]
},
'properties': { 'year': '2010' }
},
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [-104.8548, 39.7644]
},
'properties': { 'year': '2011' }
},
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [-1.1665, 52.9539]
},
'properties': { 'year': '2013' }
},
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [-122.6544, 45.5428]
},
'properties': { 'year': '2014' }
},
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [126.974, 37.5651]
},
'properties': { 'year': '2015' }
},
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [7.1112, 50.7255]
},
'properties': { 'year': '2016' }
},
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [-71.0314, 42.3539]
},
'properties': { 'year': '2017' }
},
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [39.2794, -6.8173]
},
'properties': { 'year': '2018' }
},
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [26.0961, 44.4379]
},
'properties': { 'year': '2019' }
},
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [-114.0879, 51.0279]
},
'properties': { 'year': '2020' }
}
]
}
});
 
// Add a symbol layer
map.addLayer({
'id': 'conferences',
'type': 'symbol',
'source': 'conferences',
'layout': {
'icon-image': 'custom-marker',
// get the year from the source's "year" property
'text-field': ['get', 'year'],
'text-font': [
'DIN Pro Regular',
'Arial Unicode MS Regular'
],
'text-offset': [0, 1.25],
'text-anchor': 'top'
}
});
}
);
});
</script>
 
</body>
</html>