2009-11-20 05:15:34 +09:00
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// A shim to implement the W3C Geolocation API Specification using Gears or the Ajax API
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2009-11-21 04:46:27 +09:00
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if (typeof navigator.geolocation == "undefined" || navigator.geolocation.shim ) (function(){
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2009-11-20 05:15:34 +09:00
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// -- BEGIN GEARS_INIT
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(function() {
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// We are already defined. Hooray!
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if (window.google && google.gears) {
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return;
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}
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var factory = null;
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// Firefox
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if (typeof GearsFactory != 'undefined') {
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factory = new GearsFactory();
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} else {
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// IE
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try {
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factory = new ActiveXObject('Gears.Factory');
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// privateSetGlobalObject is only required and supported on WinCE.
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if (factory.getBuildInfo().indexOf('ie_mobile') != -1) {
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factory.privateSetGlobalObject(this);
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}
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} catch (e) {
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// Safari
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if ((typeof navigator.mimeTypes != 'undefined')
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&& navigator.mimeTypes["application/x-googlegears"]) {
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factory = document.createElement("object");
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factory.style.display = "none";
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factory.width = 0;
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factory.height = 0;
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factory.type = "application/x-googlegears";
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document.documentElement.appendChild(factory);
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}
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}
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}
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// *Do not* define any objects if Gears is not installed. This mimics the
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// behavior of Gears defining the objects in the future.
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if (!factory) {
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return;
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}
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// Now set up the objects, being careful not to overwrite anything.
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//
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// Note: In Internet Explorer for Windows Mobile, you can't add properties to
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// the window object. However, global objects are automatically added as
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// properties of the window object in all browsers.
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if (!window.google) {
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google = {};
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}
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if (!google.gears) {
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google.gears = {factory: factory};
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}
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})();
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// -- END GEARS_INIT
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var GearsGeoLocation = (function() {
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// -- PRIVATE
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var geo = google.gears.factory.create('beta.geolocation');
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var wrapSuccess = function(callback, self) { // wrap it for lastPosition love
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return function(position) {
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callback(position);
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self.lastPosition = position;
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}
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}
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// -- PUBLIC
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return {
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shim: true,
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type: "Gears",
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lastPosition: null,
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getCurrentPosition: function(successCallback, errorCallback, options) {
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var self = this;
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var sc = wrapSuccess(successCallback, self);
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geo.getCurrentPosition(sc, errorCallback, options);
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},
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watchPosition: function(successCallback, errorCallback, options) {
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geo.watchPosition(successCallback, errorCallback, options);
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},
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clearWatch: function(watchId) {
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geo.clearWatch(watchId);
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},
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getPermission: function(siteName, imageUrl, extraMessage) {
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geo.getPermission(siteName, imageUrl, extraMessage);
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}
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};
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2009-11-21 04:46:27 +09:00
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});
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2009-11-20 05:15:34 +09:00
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var AjaxGeoLocation = (function() {
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// -- PRIVATE
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var loading = false;
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var loadGoogleLoader = function() {
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if (!hasGoogleLoader() && !loading) {
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loading = true;
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var s = document.createElement('script');
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s.src = 'http://www.google.com/jsapi?callback=_google_loader_apiLoaded';
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s.type = "text/javascript";
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document.getElementsByTagName('body')[0].appendChild(s);
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}
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};
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var queue = [];
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var addLocationQueue = function(callback) {
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queue.push(callback);
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}
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var runLocationQueue = function() {
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if (hasGoogleLoader()) {
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while (queue.length > 0) {
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var call = queue.pop();
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call();
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}
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}
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}
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window['_google_loader_apiLoaded'] = function() {
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runLocationQueue();
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}
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var hasGoogleLoader = function() {
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return (window['google'] && google['loader']);
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}
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var checkGoogleLoader = function(callback) {
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if (hasGoogleLoader()) return true;
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addLocationQueue(callback);
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loadGoogleLoader();
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return false;
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};
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loadGoogleLoader(); // start to load as soon as possible just in case
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// -- PUBLIC
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return {
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shim: true,
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type: "ClientLocation",
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lastPosition: null,
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getCurrentPosition: function(successCallback, errorCallback, options) {
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var self = this;
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if (!checkGoogleLoader(function() {
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self.getCurrentPosition(successCallback, errorCallback, options);
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})) return;
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if (google.loader.ClientLocation) {
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var cl = google.loader.ClientLocation;
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var position = {
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2009-11-21 05:06:31 +09:00
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coords: {
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latitude: cl.latitude,
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longitude: cl.longitude,
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altitude: null,
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accuracy: 43000, // same as Gears accuracy over wifi?
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altitudeAccuracy: null,
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heading: null,
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speed: null,
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},
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2009-11-20 05:15:34 +09:00
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// extra info that is outside of the bounds of the core API
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address: {
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city: cl.address.city,
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country: cl.address.country,
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country_code: cl.address.country_code,
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region: cl.address.region
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2009-11-21 05:06:31 +09:00
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},
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timestamp: new Date()
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2009-11-20 05:15:34 +09:00
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};
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successCallback(position);
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this.lastPosition = position;
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} else if (errorCallback === "function") {
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errorCallback({ code: 3, message: "Using the Google ClientLocation API and it is not able to calculate a location."});
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}
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},
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watchPosition: function(successCallback, errorCallback, options) {
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this.getCurrentPosition(successCallback, errorCallback, options);
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var self = this;
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var watchId = setInterval(function() {
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self.getCurrentPosition(successCallback, errorCallback, options);
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}, 10000);
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return watchId;
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},
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clearWatch: function(watchId) {
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clearInterval(watchId);
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},
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getPermission: function(siteName, imageUrl, extraMessage) {
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// for now just say yes :)
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return true;
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}
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};
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2009-11-21 04:46:27 +09:00
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});
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2009-11-20 05:15:34 +09:00
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// If you have Gears installed use that, else use Ajax ClientLocation
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2009-11-21 04:46:27 +09:00
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navigator.geolocation = (window.google && google.gears) ? GearsGeoLocation() : AjaxGeoLocation();
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2009-11-20 05:15:34 +09:00
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})();
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