Example of a scale line.
<!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/3.8.1/css/ol.css" type="text/css"> <script src="http://openlayers.org/en/3.8.1/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>