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Accept coordinates as input to a geocoder

Use the mapbox-gl-geocoder control to search for places using Mapbox Geocoding API, while accepting geographic coordinates provided as input.

Mapbox GL unsupported
Mapbox GL requires WebGL support. Please check that you are using a supported browser and that WebGL is enabled.
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title>Accept coordinates as input to a geocoder</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.54.0/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.54.0/mapbox-gl.css' rel='stylesheet' />
<style>
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<script src='https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-geocoder/v4.3.0/mapbox-gl-geocoder.min.js'></script>
<link rel='stylesheet' href='https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-geocoder/v4.3.0/mapbox-gl-geocoder.css' type='text/css' />
<div id='map'></div>
<script>
mapboxgl.accessToken = '<your access token here>';
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/streets-v11',
center: [-79.4512, 43.6568],
zoom: 13
});
/* given a query in the form "lng, lat" or "lat, lng" returns the matching
* geographic coordinate(s) as search results in carmen geojson format,
* https://github.com/mapbox/carmen/blob/master/carmen-geojson.md
*/
var coordinatesGeocoder = function (query) {
// match anything which looks like a decimal degrees coordinate pair
var matches = query.match(/^[ ]*(?:Lat: )?(-?\d+\.?\d*)[, ]+(?:Lng: )?(-?\d+\.?\d*)[ ]*$/i);
if (!matches) {
return null;
}
function coordinateFeature(lng, lat) {
return {
center: [lng, lat],
geometry: {
type: "Point",
coordinates: [lng, lat]
},
place_name: 'Lat: ' + lat + ' Lng: ' + lng, // eslint-disable-line camelcase
place_type: ['coordinate'], // eslint-disable-line camelcase
properties: {},
type: 'Feature'
};
}
var coord1 = Number(matches[1]);
var coord2 = Number(matches[2]);
var geocodes = [];
if (coord1 < -90 || coord1 > 90) {
// must be lng, lat
geocodes.push(coordinateFeature(coord1, coord2));
}
if (coord2 < -90 || coord2 > 90) {
// must be lat, lng
geocodes.push(coordinateFeature(coord2, coord1));
}
if (geocodes.length === 0) {
// else could be either lng, lat or lat, lng
geocodes.push(coordinateFeature(coord1, coord2));
geocodes.push(coordinateFeature(coord2, coord1));
}
return geocodes;
};
map.addControl(new MapboxGeocoder({
accessToken: mapboxgl.accessToken,
localGeocoder: coordinatesGeocoder,
zoom: 4,
placeholder: "Try: -40, 170",
mapboxgl: mapboxgl
}));
</script>
</body>
</html>