diff options
| -rw-r--r-- | js/geometa.js | 123 |
1 files changed, 118 insertions, 5 deletions
diff --git a/js/geometa.js b/js/geometa.js index 87e3c99a1..21deb1885 100644 --- a/js/geometa.js +++ b/js/geometa.js @@ -1,4 +1,4 @@ -// A shim to implement the W3C Geolocation API Specification using Gears +// 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 @@ -96,9 +96,122 @@ var GearsGeoLocation = (function() { }; }); -// If you have Gears installed use that -if (window.google && google.gears) { - navigator.geolocation = GearsGeoLocation(); -} +var AjaxGeoLocation = (function() { + // -- PRIVATE + var loading = false; + var loadGoogleLoader = function() { + if (!hasGoogleLoader() && !loading) { + loading = true; + var s = document.createElement('script'); + s.src = (document.location.protocol == "https:"?"https://":"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 = { + coords: { + latitude: cl.latitude, + longitude: cl.longitude, + altitude: null, + accuracy: 43000, // same as Gears accuracy over wifi? + altitudeAccuracy: null, + heading: null, + speed: null, + }, + // 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 + }, + timestamp: new Date() + }; + + 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(); })(); |