alloy/samples/mapping/lib/geo.js

Appcelerator Titanium MVC Framework

var GOOGLE_BASE_URL = 'http://maps.google.com/maps/api/geocode/json?address=';
var ERROR_MESSAGE = 'There was an error geocoding. Please try again.';

var GeoData = function(title, latitude, longitude) {
	this.title = title;
	this.coords = {
		latitude: latitude,
		longitude: longitude
	};
};

exports.forwardGeocode = function(address, callback) {
	if (Ti.Platform.osname === 'mobileweb') {
		forwardGeocodeWeb(address, callback);
	} else {
		forwardGeocodeNative(address, callback);
	}
};

var forwardGeocodeNative = function(address, callback) {
	var xhr = Titanium.Network.createHTTPClient();
	var url = GOOGLE_BASE_URL + address.replace(' ', '+');
	url += "&sensor=" + (Titanium.Geolocation.locationServicesEnabled == true);

	xhr.open('GET', url);
	xhr.onload = function() {
		var json = JSON.parse(this.responseText);
		if (json.status != 'OK') {
	    	alert('Unable to geocode the address');
	    	return;
	    }

	    callback(new GeoData(
	    	address,
	    	json.results[0].geometry.location.lat,
	    	json.results[0].geometry.location.lng
	    ));
	};
	xhr.onerror = function(e) {
		Ti.API.error(e.error);
		alert(ERROR_MESSAGE);
	};
	xhr.send();
};

var forwardGeocodeWeb = function(address, callback) {
	var geocoder = new google.maps.Geocoder();
	if (geocoder) {
		geocoder.geocode({ 'address': address }, function (results, status) {
			if (status == google.maps.GeocoderStatus.OK) {
				callback(new GeoData(
					address,
					results[0].geometry.location.lat(),
					results[0].geometry.location.lng()
				));
			} else {
				Ti.API.error(status);
				alert(ERROR_MESSAGE);
			}
		});
	} else {
		alert('Google Maps Geocoder not supported');
	}
};