Scale Line

Example of a scale line.

<!DOCTYPE html>
    <title>Scale Line</title>
    <link rel="stylesheet" href="" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src=",Element.prototype.classList,URL"></script>
    <script src=""></script>
    <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" selected>metric</option>
      var scaleLineControl = new ol.control.ScaleLine();

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

      var unitsSelect = document.getElementById('units');
      function onChange() {
      unitsSelect.addEventListener('change', onChange);