Load WFS with jQuery Ajax and Check Number of loaded features

HTML

<script src="http://openlayers.org/api/OpenLayers.js"></script>
<body>
    <div id="map" class="smallmap"></div>
</body>

CSS

#map {
    width: 400px;
    height: 400px;
    border: 1px solid #dddddd;
}

JavaScript

var map = new OpenLayers.Map('map', {
    maxExtent: OpenLayers.Bounds.fromString("-180,-90,180,90"),
    projection: new OpenLayers.Projection("EPSG:4326"),
    displayProjection: new OpenLayers.Projection("EPSG:4326")

});

var basic = new OpenLayers.Layer.WMS("Basic", "http://vmap0.tiles.osgeo.org/wms/vmap0", {
    layers: 'basic'
}, {
    singleTile: true,
    ratio: 1,
    transitionEffect: 'resize',
    opacity: 0.5
});

var url = 'http://geospatial.ga:8080/geoserver/newdata/ows?service=WFS&' +
    'version=1.1.0&request=GetFeature&typeName=newdata:missouri_building&' +
    'outputFormat=text/javascript&format_options=callback:loadFeatures&maxFeatures=10000&' +
    'srsname=EPSG:4326';

$.ajax({
    url: url,
    dataType: 'jsonp',
    success: function (result) {
        console.log(result);
    },
    error: function (data) {
        console.log(data);
    }
});


var wfsSuscribers = new OpenLayers.Layer.Vector("WFS");

wfsSuscribers.events.register('featuresadded', wfsSuscribers, function () {

    console.log("Number of Features:" + wfsSuscribers.features.length);
    map.zoomToExtent(wfsSuscribers.getDataExtent());
});

map.addLayers([basic, wfsSuscribers]);
map.zoomToMaxExtent();

var i_o_options = {
    'internalProjection': map.projection,
        'externalProjection': new OpenLayers.Projection("EPSG:4326")
};
var geojson_format = new OpenLayers.Format.GeoJSON(i_o_options);

var loadFeatures = function (response) {
    wfsSuscribers.addFeatures(geojson_format.read(response, "FeatureCollection"));
};


window.loadFeatures = loadFeatures;


map.setCenter(new OpenLayers.LonLat(11.52, 3.83), 3);