Leaflet Control Geocoder

A simple geocoder for Leaflet that by default uses OSM/Nominatim to locate places, but also supports Bing Locations API and can easily be extended to support other providers.

See the Leaflet Control Geocoder Demo.

Usage

Load the CSS and Javascript:

<link rel="stylesheet" href="../Control.Geocoder.css" />
<script src="Control.Geocoder.js"></script>

Add the control to a map instance:

var map = L.map('map').setView([0, 0], 2);
L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
    attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);
L.Control.geocoder().addTo(map);

Customizing

By default, when a geocoding result is found, the control will center the map on it and place a marker at its location. This can be customized by overwriting the control's markGeocode function, to perform any action desired.

For example:

var geocoder = L.Control.geocoder().addTo(map);

geocoder.markGeocode = function(result) {
    var bbox = result.bbox;
    L.polygon([
         bbox.getSouthEast(),
         bbox.getNorthEast(),
         bbox.getNorthWest(),
         bbox.getSouthWest()
    ]).addTo(map);
};

This will add a polygon representing the result's boundingbox when a result is selected.

API

L.Control.Geocoder

This is the geocoder control. It works like any other Leaflet control, and is added to the map.

Constructor

L.Control.Geocoder(options)

Options

Option	Type	Default	Description
collapsed	Boolean	true	Collapse control unless hovered/clicked
position	String	"topright"	Control position
placeholder	String	"Search..."	Placeholder text for text input
errorMessage	String	"Nothing found."	Message when no result found / geocoding error occurs
geocoder	IGeocoder	new L.Control.Geocoder.Nominatim()	Object to perform the actual geocoding queries
showResultIcons	Boolean	false	Show icons for geocoding results (if available); supported by Nominatim

Methods

Method	Returns	Description
markGeocode( result)	this	Marks a geocoding result on the map

L.Control.Geocoder.Nominatim

Uses Nominatim to respond to geocoding queries. This is the default geocoding service used by the control, unless otherwise specified in the options. Implements IGeocoder.

Unless using your own Nominatim installation, please refer to the Nominatim usage policy.

Constructor

L.Control.Geocoder.Nominatim(options)

Options

Option	Type	Default	Description
serviceUrl	String	"http://nominatim.openstreetmap.org/"	URL of the service
geocodingQueryParams	Object	{}	Additional URL parameters (strings) that will be added to geocoding requests
reverseQueryParams	Object	{}	Additional URL parameters (strings) that will be added to reverse geocoding requests

L.Control.Geocoder.Bing

Uses Bing Locations API to respond to geocoding queries. Implements IGeocoder.

Note that you need an API key to use this service.

Constructor

L.Control.Geocoder.Bing(<String> key)

IGeocoder

An interface implemented to respond to geocoding queries.

Methods

Method	Returns	Description
geocode( query, callback, context)	GeocodingResult[]	Performs a geocoding query and returns the results to the callback in the provided context
reverse(<L.LatLng> location, scale, callback, context)	GeocodingResult[]	Performs a reverse geocoding query and returns the results to the callback in the provided context

GeocodingResult

An object that represents a result from a geocoding query.

Properties

Property	Type	Description
name	String	Name of found location
bounds	L.LatLngBounds	The bounds of the location
center	L.LatLng	The center coordinate of the location
icon	String	URL for icon representing result; optional