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Diffstat (limited to 'js/geometa.js')
| -rw-r--r-- | js/geometa.js | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/js/geometa.js b/js/geometa.js new file mode 100644 index 000000000..ced5be060 --- /dev/null +++ b/js/geometa.js @@ -0,0 +1,216 @@ +// 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; + +})(); |