Why is my function getting 0 results?

var $scope,
  objectByString = function(o, s) {
    s = s.replace(/\[(\w+)\]/g, '.$1');
    s = s.replace(/^\./, '');
    var a = s.split('.');
    for (var i = 0, n = a.length; i < n; ++i) {
      var k = a[i];
      if (k in o) {
        o = o[k];
      } else {
        return;
      }
    }
    return o;
  },
  getMarkersPath = function(amountPath) {
    var paths = amountPath.split('.');

    return paths[paths.length - 1] + 'Markers';
  },
  getAttractionsInArea = function($scope, typesValue) {
    getPlacesInArea($scope, typesValue, 'filters.location.attractions', 'fa-star', showAttractionMarkers);
  },
  showAttractionMarkers = function($scope) {
    var checked = $scope.searchData.filters.location.attractions.checked;

    if (checkPropertyExistence($scope, ['attractionsMarkers'])) {
      showPlacesMarkers($scope.map, $scope.attractionsMarkers, checked);
    }
  },

  clearPlacesMarkers = function($scope, markersPath) {
    if (checkPropertyExistence($scope, [markersPath])) {
      var types = $scope[markersPath];
      for (var type in types) {
        if (types.hasOwnProperty(type)) {
          setMapForMarkers(types[type].items, null);
        }
      }
    }
  },
  showPlacesMarkers = function(map, markers, checked) {
    if (typeof map != 'undefined' && checked) {
      for (var key in markers) {
        if (markers.hasOwnProperty(key) && markers[key].checked) {
          setMapForMarkers(markers[key].items, map);
        }
      }
    } else {
      for (var type in markers) {
        if (markers.hasOwnProperty(type) && markers[type].checked) {
          setMapForMarkers(markers[type].items, null);
        }
      }
    }
  },
  getPlacesInArea = function($scope, types, propertyPath, icon, callback) {
    var markersPath = getMarkersPath(propertyPath);
    this.clearPlacesMarkers($scope, markersPath);

    addToProperty($scope.searchData, propertyPath + '.amount', 0);
    $scope[markersPath] = types;
    types = $scope[markersPath];

    if (typeof $scope.map != 'undefined') {
      for (var key in types) {
        if (types.hasOwnProperty(key) && types[key].checked) {
          this.getPlace($scope, key, propertyPath, icon);
        }
      }
      callback($scope);
    }
  },
  getPlace = function($scope, key, propertyPath, icon) {
    var service = new google.maps.places.PlacesService($scope.map),
      request = {
        location: new google.maps.LatLng($scope.searchData.location.lat, $scope.searchData.location.lon),
        radius: 700,
        types: [key]
      },
      markersPath = getMarkersPath(propertyPath);

    service.nearbySearch(request, function(results, status) {
      if (status == google.maps.places.PlacesServiceStatus.OK) {
        var markers = [],
          amount = objectByString($scope.searchData, propertyPath + '.amount');

        for (var i = 0; i < results.length; i++) {
          var place = results[i];

          var typeIcon = null;
          if (checkPropertyExistence($scope, [markersPath, key, 'icon'])) {
            typeIcon = objectByString($scope, markersPath + '.' + key + '.icon');
          }

          var markerIcon = (typeIcon !== null ? typeIcon : (icon !== null ? icon : place.icon)),
            marker = addMarker(place.geometry.location, null, markerIcon);

          addInfoBubble(marker, place.name, place.vicinity.substr(0, 70), markerIcon, $scope.map, key.replace(/_/g, ' '));
          markers.push(marker);

          if (checkPropertyExistence($scope, [markersPath, key, 'items'])) {
            $scope[markersPath][key]['items'] = markers;
          }
        }

        addToProperty($scope.searchData, propertyPath + '.amount', amount + markers.length);
      }
    })
  },
  addToProperty = function($searchData, $keyString, $value) {
    var keys = $keyString.split(".");
    lastKeyIndex = keys.length - 1;
    for (var i = 0; i < lastKeyIndex; ++i) {
      key = keys[i];
      if (!(key in $searchData))
        $searchData[key] = {};
      $searchData = $searchData[key];
    }
    $searchData[keys[lastKeyIndex]] = $value;
  },
  checkPropertyExistence = function(obj, paths) {
    for (var i = 0; i < paths.length; i++) {
      if (!obj || !obj.hasOwnProperty(paths[i])) {
        return false;
      }
      obj = obj[paths[i]];
    }
    return true;
  },
  addMarker = function(point, map, icon, color) {
    if (typeof color == 'undefined') {
      color = "#000000";
    }
    return new MarkerWithLabel({
      position: point,
      map: map,
      icon: ' ',
      labelContent: '<i class="fa ' + icon + ' fa-2x" style="color:' + color + ';"></i>',
      labelAnchor: point
    });
  },
  addInfoBubble = function(marker, title, content, icon, map, additionalInfo) {
    if (typeof icon == 'undefined') {
      icon = "fa-map-marker";
    }

    if (typeof additionalInfo == 'undefined') {
      additionalInfo = "";
    }

    var bounds = map.getBounds(),
      myOptions = {
        content: "<div class='info'>" +
          "<div class='infoBubble'>" +
          "<h4><i class='fa " + icon + "'></i> " + title + " <small>" + additionalInfo + "</small></h4>" +
          "<p>" + content + "</p>" +
          "</div>" +
          "</div>",
        disableAutoPan: true,
        position: new google.maps.LatLng(bounds.getNorthEast().lat(), bounds.getSouthWest().lng()),
        isHidden: false,
        closeBoxURL: ""
      };

    var infobox = new InfoBox(myOptions);

    google.maps.event.addListener(marker, 'mouseover', function() {
      infobox.open(map);
    });
    google.maps.event.addListener(marker, 'mouseout', function() {
      infobox.close();
    });

    return infobox;

  },
  setMapForMarkers = function(markers, map) {
    var self = this;
    for (var i = 0; i < markers.length; i++) {
      try {
        markers[i].setMap(map);
      } catch (e) {

      }
    }
  };

function initialize() {
  $scope = {
    searchData: {
      location: {
        lat: 40.722840,
        lon: -73.999585
      }
    },
    filters: {
      location: {
        attractions: {
          checked: true
        }
      }
    }
  };
  var mapProp = {
    center: new google.maps.LatLng(40.722840, -73.999585),
    zoom: 15,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };
  $scope.map = new google.maps.Map(document.getElementById("googleMap"), mapProp);
  $scope.getAttractionsInArea = function() {
    var value = {
      food: {
        checked: true,
        icon: null,
        items: []
      },
      art_gallery: {
        checked: true,
        icon: null,
        items: []
      },
      museum: {
        checked: true,
        icon: null,
        items: []
      },
      night_club: {
        checked: true,
        icon: null,
        items: []
      }
    };

    getAttractionsInArea($scope, value);
  };
  $scope.showAttractionMarkers = function() {
    showAttractionMarkers($scope);
  };
  $scope.getAttractionsInArea();
}

function show(element) {
  element.checked ? $scope.filters.location.attractions.checked = true : $scope.filters.location.attractions.checked = false;
  $scope.showAttractionMarkers();
}

initialize();
      

        
        
        
      

    

<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&libraries=places"></script>
<script type="text/javascript" src="http://google-maps-utility-library-v3.googlecode.com/svn/trunk/infobox/src/infobox.js"></script>
<script type="text/javascript" src="http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerwithlabel/src/markerwithlabel.js"></script>
<label>
  <input type="checkbox" value="check" id="xxx" onchange="show(this)" />Show markers
</label>
<div id="googleMap" style="width:500px;height:380px;"></div>