Accept coordinates as input to a geocoder
This example uses the mapbox-gl-geocoder control to enable users to search for places using the Mapbox Geocoding API, and accept geographic coordinates in the search query.
Search for coordinates like -40, 170 to see the geocoder return a result.
<!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"><link href="https://api.mapbox.com/mapbox-gl-js/v2.14.1/mapbox-gl.css" rel="stylesheet"><script src="https://api.mapbox.com/mapbox-gl-js/v2.14.1/mapbox-gl.js"></script><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/v5.0.0/mapbox-gl-geocoder.min.js"></script><link rel="stylesheet" href="https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-geocoder/v5.0.0/mapbox-gl-geocoder.css" type="text/css"> <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 Studiostyle: 'mapbox://styles/mapbox/streets-v12',center: [-79.4512, 43.6568],zoom: 8}); /* 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 */const coordinatesGeocoder = function (query) {// Match anything which looks like// decimal degrees coordinate pair.const 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,place_type: ['coordinate'],properties: {},type: 'Feature'};} const coord1 = Number(matches[1]);const coord2 = Number(matches[2]);const geocodes = []; if (coord1 < -90 || coord1 > 90) {// must be lng, latgeocodes.push(coordinateFeature(coord1, coord2));} if (coord2 < -90 || coord2 > 90) {// must be lat, lnggeocodes.push(coordinateFeature(coord2, coord1));} if (geocodes.length === 0) {// else could be either lng, lat or lat, lnggeocodes.push(coordinateFeature(coord1, coord2));geocodes.push(coordinateFeature(coord2, coord1));} return geocodes;}; // Add the control to the map.map.addControl(new MapboxGeocoder({accessToken: mapboxgl.accessToken,localGeocoder: coordinatesGeocoder,zoom: 4,placeholder: 'Try: -40, 170',mapboxgl: mapboxgl,reverseGeocode: true}));</script> </body></html>