WFS example

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// format used to parse WFS GetFeature responses
var geojsonFormat = new ol.format.GeoJSON();

/**
 * JSONP WFS callback function.
 * @param {Object} response The response object.
 */
window.loadFeatures = function(response) {
  vectorSource.addFeatures(geojsonFormat.readFeatures(response));
};

var vector = new ol.layer.Vector({
  source: vectorSource,
  style: new ol.style.Style({
    stroke: new ol.style.Stroke({
      color: 'rgba(0, 0, 255, 1.0)',
      width: 2
    })
  })
});

var raster = new ol.layer.Tile({
  source: new ol.source.BingMaps({
    imagerySet: 'Aerial',
    key: 'Ak-dzM4wZjSqTlzveKz5u0d4IQ4bRzVI309GxmkgSVr1ewS6iPSrOvOKhA-CJlm3'
  })
});

var map = new ol.Map({
  layers: [raster, vector],
  target: document.getElementById('map'),
  view: new ol.View({
    center: [-8908887.277395891, 5381918.072437216],
    maxZoom: 19,
    zoom: 12
  })
});

<!DOCTYPE html>
<html>
<head>
<title>WFS example</title>
<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="http://openlayers.org/en/v3.8.2/css/ol.css" type="text/css">
<script src="http://openlayers.org/en/v3.8.2/build/ol.js"></script>

</head>
<body>
<div class="container-fluid">

<div class="row-fluid">
  <div class="span12">
    <div id="map" class="map"></div>
  </div>
</div>

</div>
<script>
// format used to parse WFS GetFeature responses
var geojsonFormat = new ol.format.GeoJSON();

var vectorSource = new ol.source.Vector({
  loader: function(extent, resolution, projection) {
    var url = 'http://demo.boundlessgeo.com/geoserver/wfs?service=WFS&' +
        'version=1.1.0&request=GetFeature&typename=osm:water_areas&' +
        'outputFormat=text/javascript&format_options=callback:loadFeatures' +
        '&srsname=EPSG:3857&bbox=' + extent.join(',') + ',EPSG:3857';
    // use jsonp: false to prevent jQuery from adding the "callback"
    // parameter to the URL
    $.ajax({url: url, dataType: 'jsonp', jsonp: false});
  },
  strategy: ol.loadingstrategy.tile(ol.tilegrid.createXYZ({
    maxZoom: 19
  }))
});


/**
 * JSONP WFS callback function.
 * @param {Object} response The response object.
 */
window.loadFeatures = function(response) {
  vectorSource.addFeatures(geojsonFormat.readFeatures(response));
};

var vector = new ol.layer.Vector({
  source: vectorSource,
  style: new ol.style.Style({
    stroke: new ol.style.Stroke({
      color: 'rgba(0, 0, 255, 1.0)',
      width: 2
    })
  })
});

var raster = new ol.layer.Tile({
  source: new ol.source.BingMaps({
    imagerySet: 'Aerial',
    key: 'Ak-dzM4wZjSqTlzveKz5u0d4IQ4bRzVI309GxmkgSVr1ewS6iPSrOvOKhA-CJlm3'
  })
});

var map = new ol.Map({
  layers: [raster, vector],
  target: document.getElementById('map'),
  view: new ol.View({
    center: [-8908887.277395891, 5381918.072437216],
    maxZoom: 19,
    zoom: 12
  })
});

</script>
</body>
</html>