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/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>