OpenLayers 3 Beginner’s Guide

Track me

Open sample in a new windows

<!doctype html>
    <title>Map Examples</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
    <link rel="stylesheet" href="../assets/ol3/css/ol.css" type="text/css" />
    <link rel="stylesheet" href="../assets/css/samples.css" type="text/css" />
    <link href="//" rel="stylesheet">
    <div id="map" class="full-map"></div>
    <div id="location" class="marker"><span class="icon-arrow-up"></span></div>
    <script src="../assets/ol3/js/ol-debug.js"></script>
      // create a style to display our position history (track)
      var trackStyle = new{
        stroke: new{
          color: 'rgba(0,0,255,1.0)',
          width: 3,
          lineCap: 'round'
      // use a single feature with a linestring geometry to display our track
      var trackFeature = new ol.Feature({
        geometry: new ol.geom.LineString([])
      // we'll need a vector layer to render it
      var trackLayer = new ol.layer.Vector({
        source: new ol.source.Vector({
          features: [trackFeature]
        style: trackStyle
      var baseLayer = new ol.layer.Tile({
        source: new ol.source.OSM()
      var london = ol.proj.transform([-0.12755, 51.507222], 'EPSG:4326', 'EPSG:3857');
      var view = new ol.View({
        center: london,
        zoom: 6
      var map = new ol.Map({
        target: 'map',
        layers: [baseLayer, trackLayer],
        view: view
      // set up the geolocation api to track our position
      var geolocation = new ol.Geolocation({
        tracking: true
      // bind the view's projection
      geolocation.bindTo('projection', view);
      // when we get a position update, add the coordinate to the track's
      // geometry and recenter the view
      geolocation.on('change:position', function() {
        var coordinate = geolocation.getPosition();
      // put a marker at our current position
      var marker = new ol.Overlay({
        element: document.getElementById('location'),
        positioning: 'center-center'
      marker.bindTo('position', geolocation);
      // rotate the view to match the device orientation
      var deviceOrientation = new ol.DeviceOrientation({
        tracking: true
      deviceOrientation.on('change:heading', onChangeHeading);
      function onChangeHeading(event) {
        var heading =;