leaflet-control-geocoder/src/geocoders/nominatim.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: '//nominatim.openstreetmap.org/',
			geocodingQueryParams: {},
			reverseQueryParams: {},
			htmlTemplate: function(r) {
				var a = r.address,
					parts = [];
				if (a.road || a.building) {
					parts.push('{building} {road} {house_number}');
				}

				if (a.city || a.town || a.village) {
					parts.push('<span class="' + (parts.length > 0 ? 'leaflet-control-geocoder-address-detail' : '') +
						'">{postcode} {city} {town} {village}</span>');
				}

				if (a.state || a.country) {
					parts.push('<span class="' + (parts.length > 0 ? 'leaflet-control-geocoder-address-context' : '') +
						'">{state} {country}</span>');
				}

				return Util.template(parts.join('<br/>'), a, true);
			}
		},

		initialize: function(options) {
			L.Util.setOptions(this, options);
		},

		geocode: function(query, cb, context) {
			Util.jsonp(this.options.serviceUrl + 'search', L.extend({
				q: query,
				limit: 5,
				format: 'json',
				addressdetails: 1
			}, this.options.geocodingQueryParams),
			function(data) {
				var results = [];
				for (var i = data.length - 1; i >= 0; i--) {
					var bbox = data[i].boundingbox;
					for (var j = 0; j < 4; j++) bbox[j] = parseFloat(bbox[j]);
					results[i] = {
						icon: data[i].icon,
						name: data[i].display_name,
						html: this.options.htmlTemplate ?
							this.options.htmlTemplate(data[i])
							: undefined,
						bbox: L.latLngBounds([bbox[0], bbox[2]], [bbox[1], bbox[3]]),
						center: L.latLng(data[i].lat, data[i].lon),
						properties: data[i]
					};
				}
				cb.call(context, results);
			}, this, 'json_callback');
		},

		reverse: function(location, scale, cb, context) {
			Util.jsonp(this.options.serviceUrl + 'reverse', L.extend({
				lat: location.lat,
				lon: location.lng,
				zoom: Math.round(Math.log(scale / 256) / Math.log(2)),
				addressdetails: 1,
				format: 'json'
			}, this.options.reverseQueryParams), function(data) {
				var result = [],
				    loc;

				if (data && data.lat && data.lon) {
					loc = L.latLng(data.lat, data.lon);
					result.push({
						name: data.display_name,
						html: this.options.htmlTemplate ?
							this.options.htmlTemplate(data)
							: undefined,
						center: loc,
						bounds: L.latLngBounds(loc, loc),
						properties: data
					});
				}

				cb.call(context, result);
			}, this, 'json_callback');
		}
	}),

	factory: function(options) {
		return new L.Control.Geocoder.Nominatim(options);
	}
};