Mapbox GL JS and GeoJSON as an external file - mapbox

Question

I have code to set markers with Mapbox map
$(function() {
mapboxgl.accessToken = 'pk.###';
var map = new mapboxgl.Map({
container: 'map-global',
style: '..'
});
var geojson = {
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {
"title": "POI Title"
},
"geometry": {
"type": "Point",
"coordinates": [0, 0]
}
}
]
};
geojson.features.forEach(function(marker) {
// create a HTML element for each feature
var el = document.createElement('div');
el.className = 'marker';
new mapboxgl.Marker(el)
.setLngLat(marker.geometry.coordinates)
.setPopup(new mapboxgl.Popup()
.setHTML(marker.properties.title))
.addTo(map);
});
});
And it works fine. But I want to use GeoJSON as an external file:
var geojson = 'file.geojson';
And here I have a problem — it doesn't work:
TypeError: undefined is not an object (evaluating '"map.geojson".features.forEach')".
Is there any way to use external GeoJSON file with custom HTML
markers?

Answer 1

You can load external geojson files with plain mapbox addSource().
map.on('load', function() {
var url = 'http://your_geojson_file.com/some_file.geojson';
map.addSource('source_id', { type: 'geojson', data: url});
});
See this example:
https://www.mapbox.com/mapbox-gl-js/example/live-geojson/

Answer 2

Since you are using Jquery, you could use getJSON to load your file:
Load JSON-encoded data from the server using a GET HTTP request.
Reference: http://api.jquery.com/jquery.getjson/
Example:
$.getJSON('file.geojson', function (geojson) {
geojson.features.forEach(function (marker) {
// etc
});
});