Question

Here is a quick question, I have the following method within an object, why is it returning undefined?

var getGeoLocation = function() {
            if (typeof(navigator.geolocation) != 'undefined') {
                var test = navigator.geolocation.getCurrentPosition(function(position) {
                    var lat = position.coords.latitude;
                    var lng = position.coords.longitude;
                    return(new google.maps.LatLng(lat, lng));    
                });
            }
        }
var testFunction = function() {alert(getGeoLocation()); // returns undefined?}

Answer 1

This is because navigator.geolocation.getCurrentPosition is asynchronous. The getGeoLocation function returns before the anonymous callback function passed to getCurrentPosition has been executed, and since the getGeoLocation function has no return statement, it returns undefined.

Move code that depends on the response from navigator.geolocation.getCurrentPosition inside the callback.