geocoder.js

(function() {
  var Geocoder = function(address, cb) {
    this.address = address;
    this.geocoder = new google.maps.Geocoder();
    this.geocode(cb);
  };
  
  Geocoder.prototype = {    
    geocode : function(cb) {
      if (this.address === "") return false;
      var that = this;

      this.geocoder.geocode({'address': that.address, 'region' : 'us'}, function(results, status){

        if (results.length === 0) {
          return cb({ error : 'We couldn\'t find any results for that address. Please try again'});
        }
        
        var geom = results[0]['geometry'];
        if (status == google.maps.GeocoderStatus.OK) {
          that.location_type = geom['location_type'];
          var location = geom['location'];
          if (that.isValidLocationType()) {
            that.ll = {
                    lat           : location.lat(),
                    lng           : location.lng(), 
                    location_type : that.location_type
            };
          } else {
            that.ll = {
              error : "Can't find specific enough results. Please try again."
            };
          }
          if (cb)
            cb(that.ll);
        }
      });
    },
    
    isValidLocationType : function() {
      if (this.isValidZip() || this.hasComma()) {
        return true;
      } else if (this.location_type === "RANGE_INTERPOLATED" || this.location_type === "ROOFTOP" ) {
        return true;
      } else {
        return false;
      }
    },
    
    isValidZip : function() {
      return !_.isNull(this.address.match(/^[0-9]{5}$/));
    },
    
    hasComma : function() {
      return !_.isNull(this.address.match(/,/));
    }
  };
  window.Geocoder = Geocoder;  
})();