Hello.I'm making an application in ionic.I'm using cordova geolocation plugin.I want when i change my position location to be updated .I should see an alert but i don't see anything.What i should do ? Here is my code:

$ionicPlatform
                        .ready(function() {
                            // location detector

                            var posOption = {
                                timeout : 1000,
                                enableHighAccuracy : false
                            };
                            $cordovaGeolocation.getCurrentPosition(
                                    posOption).then(function(position) {
                                $scope.lat = position.coords.latitude;
                                $scope.long = position.coords.longitude;
                                console.log($scope.lat);
                                socket.emit('my other event', {
                                    latitude : $scope.lat,
                                    longitude : $scope.long
                                });
                            }, function(err) {
                                console.log(err)
                            });
                            var watchOptions = {
                                frequency : 1000,
                                timeout : 3000,
                                enableHighAccuracy : false
                            // may cause errors if true
                            };
                            var watch = $cordovaGeolocation
                                    .watchPosition(watchOptions);
                            watch.then(null, function(err) {
                                // error
                            }, function(position) {
                                var lat = position.coords.latitude
                                var long = position.coords.longitude
                                $window.alert(lat);
                                socket.emit('my other event', {
                                    latitude : lat,
                                    longitude : long
                                });
                            });
                            watch.clearWatch();