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// A shim to implement the W3C Geolocation API Specification using Gears or the Ajax API
if ( typeof navigator.geolocation == "undefined" || navigator.geolocation.shim ) (function(){
// -- BEGIN GEARS_INIT
(function() {
// We are already defined. Hooray!
if (window.google && google.gears) {
return;
}
var factory = null;
// Firefox
if (typeof GearsFactory != 'undefined') {
factory = new GearsFactory();
} else {
// IE
try {
factory = new ActiveXObject('Gears.Factory');
// privateSetGlobalObject is only required and supported on WinCE.
if (factory.getBuildInfo().indexOf('ie_mobile') != -1) {
factory.privateSetGlobalObject(this);
}
} catch (e) {
// Safari
if ((typeof navigator.mimeTypes != 'undefined')
&& navigator.mimeTypes["application/x-googlegears"]) {
factory = document.createElement("object");
factory.style.display = "none";
factory.width = 0;
factory.height = 0;
factory.type = "application/x-googlegears";
document.documentElement.appendChild(factory);
}
}
}
// *Do not* define any objects if Gears is not installed. This mimics the
// behavior of Gears defining the objects in the future.
if (!factory) {
return;
}
// Now set up the objects, being careful not to overwrite anything.
//
// Note: In Internet Explorer for Windows Mobile, you can't add properties to
// the window object. However, global objects are automatically added as
// properties of the window object in all browsers.
if (!window.google) {
google = {};
}
if (!google.gears) {
google.gears = {factory: factory};
}
})();
// -- END GEARS_INIT
var GearsGeoLocation = (function() {
// -- PRIVATE
var geo = google.gears.factory.create('beta.geolocation');
var wrapSuccess = function(callback, self) { // wrap it for lastPosition love
return function(position) {
callback(position);
self.lastPosition = position;
}
}
// -- PUBLIC
return {
shim: true,
type: "Gears",
lastPosition: null,
getCurrentPosition: function(successCallback, errorCallback, options) {
var self = this;
var sc = wrapSuccess(successCallback, self);
geo.getCurrentPosition(sc, errorCallback, options);
},
watchPosition: function(successCallback, errorCallback, options) {
geo.watchPosition(successCallback, errorCallback, options);
},
clearWatch: function(watchId) {
geo.clearWatch(watchId);
},
getPermission: function(siteName, imageUrl, extraMessage) {
geo.getPermission(siteName, imageUrl, extraMessage);
}
};
})();
var AjaxGeoLocation = (function() {
// -- PRIVATE
var loading = false;
var loadGoogleLoader = function() {
if (!hasGoogleLoader() && !loading) {
loading = true;
var s = document.createElement('script');
s.src = 'http://www.google.com/jsapi?callback=_google_loader_apiLoaded';
s.type = "text/javascript";
document.getElementsByTagName('body')[0].appendChild(s);
}
};
var queue = [];
var addLocationQueue = function(callback) {
queue.push(callback);
}
var runLocationQueue = function() {
if (hasGoogleLoader()) {
while (queue.length > 0) {
var call = queue.pop();
call();
}
}
}
window['_google_loader_apiLoaded'] = function() {
runLocationQueue();
}
var hasGoogleLoader = function() {
return (window['google'] && google['loader']);
}
var checkGoogleLoader = function(callback) {
if (hasGoogleLoader()) return true;
addLocationQueue(callback);
loadGoogleLoader();
return false;
};
loadGoogleLoader(); // start to load as soon as possible just in case
// -- PUBLIC
return {
shim: true,
type: "ClientLocation",
lastPosition: null,
getCurrentPosition: function(successCallback, errorCallback, options) {
var self = this;
if (!checkGoogleLoader(function() {
self.getCurrentPosition(successCallback, errorCallback, options);
})) return;
if (google.loader.ClientLocation) {
var cl = google.loader.ClientLocation;
var position = {
latitude: cl.latitude,
longitude: cl.longitude,
altitude: null,
accuracy: 43000, // same as Gears accuracy over wifi?
altitudeAccuracy: null,
heading: null,
velocity: null,
timestamp: new Date(),
// extra info that is outside of the bounds of the core API
address: {
city: cl.address.city,
country: cl.address.country,
country_code: cl.address.country_code,
region: cl.address.region
}
};
successCallback(position);
this.lastPosition = position;
} else if (errorCallback === "function") {
errorCallback({ code: 3, message: "Using the Google ClientLocation API and it is not able to calculate a location."});
}
},
watchPosition: function(successCallback, errorCallback, options) {
this.getCurrentPosition(successCallback, errorCallback, options);
var self = this;
var watchId = setInterval(function() {
self.getCurrentPosition(successCallback, errorCallback, options);
}, 10000);
return watchId;
},
clearWatch: function(watchId) {
clearInterval(watchId);
},
getPermission: function(siteName, imageUrl, extraMessage) {
// for now just say yes :)
return true;
}
};
})();
// If you have Gears installed use that, else use Ajax ClientLocation
navigator.geolocation = (window.google && google.gears) ? GearsGeoLocation : AjaxGeoLocation;
})();
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