Thanks for you help....:) I solved it. here is the code:
var lat = position.coords.latitude;
var long = position.coords.longitude;
var latlng = new google.maps.LatLng(lat, long)
geocoder.geocode({'latLng': latlng}, function(results, status) {
$scope.$apply( function () {
if (status == google.maps.GeocoderStatus.OK) {
if (results[0]) {
for(var i=0; i<results[0].address_components.length; i++)
{
var postalCode = results[0].address_components[i].types;
}
}