Scale line example

Example of a scale line.

scale-line, openstreetmap
<!DOCTYPE html>
<html>
<head>
<title>Scale line 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>
    <select id="units">
      <option value="degrees">degrees</option>
      <option value="imperial">imperial inch</option>
      <option value="us">us inch</option>
      <option value="nautical">nautical mile</option>
      <option value="metric">metric</option>
    </select>
  </div>
</div>

</div>
<script>
var scaleLineControl = new ol.control.ScaleLine();

var map = new ol.Map({
  controls: ol.control.defaults({
    attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
      collapsible: false
    })
  }).extend([
    scaleLineControl
  ]),
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    })
  ],
  target: 'map',
  view: new ol.View({
    center: [0, 0],
    zoom: 2
  })
});


var unitsSelect = $('#units');
unitsSelect.on('change', function() {
  scaleLineControl.setUnits(this.value);
});
unitsSelect.val(scaleLineControl.getUnits());

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