How to determine if address cannot be geocoded in JavaScript using MapQuest Map API

I need to geocode bunch of addresses and pin point them on the map using MapQuest. I am using

geocodeAndAddLocations

method to do that. The only problem I have is I can't figure out if geocoding for a certain address failed or not. Does anyone know how to determine that?

Solution

I have not tested this code, but according to MapQuest API, it would be something like this:

map.geocodeAndAddLocations([
      {street:"555 17th St", postalCode:"80202"}
], function (response) {
    if (response.results.length == 0) { // FAILED!!!
        alert("can't geocode location");
    } else { // SUCCESS
        var location;
        for (j=0; j<response.results[i].locations.length; j++) {
            location = response.results[i].locations[j];
            alert('lat: ' + location.latLng.lat + ', lng: ' + location.latLng.lng);
        }
    }
});

but again, having more of your code would give a better idea what exactly you are doing and not doing.