leaflet-control-geocoder/src/geocoders/what3words.js

Extendable geocoder with builtin support for Nominatim, Bing, Google, Mapbox, Photon, What3Words, MapQuest, Mapzen

var L = require('leaflet'),
	Util = require('../util');

module.exports = {
	class: L.Class.extend({
		options: {
			serviceUrl: 'http://api.what3words.com/'
		},

		initialize: function(accessToken) {
			this._accessToken = accessToken;
		},

		geocode: function(query, cb, context) {
			//get three words and make a dot based string
			Util.getJSON(this.options.serviceUrl +'w3w', {
				key: this._accessToken,
				string: query.split(/\s+/).join('.'),
			}, function(data) {
				var results = [], loc, latLng, latLngBounds;
				if (data.position && data.position.length) {
					loc = data.words;
					latLng = L.latLng(data.position[0],data.position[1]);
					latLngBounds = L.latLngBounds(latLng, latLng);
					results[0] = {
						name: loc.join('.'),
						bbox: latLngBounds,
						center: latLng
					};
				}

				cb.call(context, results);
			});
		},

		suggest: function(query, cb, context) {
			return this.geocode(query, cb, context);
		},

		reverse: function(location, scale, cb, context) {
			Util.getJSON(this.options.serviceUrl +'position', {
				key: this._accessToken,
				position: [location.lat,location.lng].join(',')
			}, function(data) {
				var results = [],loc,latLng,latLngBounds;
				if (data.position && data.position.length) {
					loc = data.words;
					latLng = L.latLng(data.position[0],data.position[1]);
					latLngBounds = L.latLngBounds(latLng, latLng);
					results[0] = {
						name: loc.join('.'),
						bbox: latLngBounds,
						center: latLng
					};
				}
				cb.call(context, results);
			});
		}
	}),

	factory: function(accessToken) {
		return new L.Control.Geocoder.What3Words(accessToken);
	}
};