Draw and modify features example

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var raster = new ol.layer.Tile({
  source: new ol.source.MapQuest({layer: 'sat'})
});

var map = new ol.Map({
  layers: [raster],
  target: 'map',
  view: new ol.View({
    center: [-11000000, 4600000],
    zoom: 4
  })
});

var modify = new ol.interaction.Modify({
  features: features,
  // the SHIFT key must be pressed to delete vertices, so
  // that new vertices can be drawn at the same position
  // of existing vertices
  deleteCondition: function(event) {
    return ol.events.condition.shiftKeyOnly(event) &&
        ol.events.condition.singleClick(event);
  }
});
map.addInteraction(modify);

var draw; // global so we can remove it later
function addInteraction() {
  draw = new ol.interaction.Draw({
    features: features,
    type: /** @type {ol.geom.GeometryType} */ (typeSelect.value)
  });
  map.addInteraction(draw);
}

var typeSelect = document.getElementById('type');

/**
 * Let user change the geometry type.
 * @param {Event} e Change event.
 */
typeSelect.onchange = function(e) {
  map.removeInteraction(draw);
  addInteraction();
};

addInteraction();

<!DOCTYPE html>
<html>
<head>
<title>Draw and modify features 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/v3.9.0/css/ol.css" type="text/css">
<script src="http://openlayers.org/en/v3.9.0/build/ol.js"></script>

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

<div class="row-fluid">
  <div class="span12">
    <div id="map" class="map"></div>
  </div>
  <form class="form-inline">
    <label>Geometry type &nbsp;</label>
    <select id="type">
      <option value="Point">Point</option>
      <option value="LineString">LineString</option>
      <option value="Polygon">Polygon</option>
    </select>
  </form>
</div>

</div>
<script>
var raster = new ol.layer.Tile({
  source: new ol.source.MapQuest({layer: 'sat'})
});

var map = new ol.Map({
  layers: [raster],
  target: 'map',
  view: new ol.View({
    center: [-11000000, 4600000],
    zoom: 4
  })
});

var features = new ol.Collection();
var featureOverlay = new ol.layer.Vector({
  source: new ol.source.Vector({features: features}),
  style: new ol.style.Style({
    fill: new ol.style.Fill({
      color: 'rgba(255, 255, 255, 0.2)'
    }),
    stroke: new ol.style.Stroke({
      color: '#ffcc33',
      width: 2
    }),
    image: new ol.style.Circle({
      radius: 7,
      fill: new ol.style.Fill({
        color: '#ffcc33'
      })
    })
  })
});
featureOverlay.setMap(map);

var modify = new ol.interaction.Modify({
  features: features,
  // the SHIFT key must be pressed to delete vertices, so
  // that new vertices can be drawn at the same position
  // of existing vertices
  deleteCondition: function(event) {
    return ol.events.condition.shiftKeyOnly(event) &&
        ol.events.condition.singleClick(event);
  }
});
map.addInteraction(modify);

var draw; // global so we can remove it later
function addInteraction() {
  draw = new ol.interaction.Draw({
    features: features,
    type: /** @type {ol.geom.GeometryType} */ (typeSelect.value)
  });
  map.addInteraction(draw);
}

var typeSelect = document.getElementById('type');


/**
 * Let user change the geometry type.
 * @param {Event} e Change event.
 */
typeSelect.onchange = function(e) {
  map.removeInteraction(draw);
  addInteraction();
};

addInteraction();

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