OpenLayers 3 Beginner’s Guide

Linking two views

<!doctype html>
<html>
  <head>
    <title>Map Examples</title>
    <link rel="stylesheet" href="../assets/ol3/css/ol.css" type="text/css" />
    <link rel="stylesheet" href="../assets/css/samples.css" type="text/css" />
  </head>
  <body>
    <div id="map1" class="half-map"></div>
    <div id="map2" class="half-map"></div>
    <script src="../assets/ol3/js/ol.js"></script>
    <script>
      var layer = 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: [-201694.22, 6880651.07],
        zoom: 6
      });
      // create two maps
      var map1 = new ol.Map({
        target: 'map1',
        layers: [layer]
      });
      var map2 = new ol.Map({
        target: 'map2',
        layers: [layer],
        view: view
      });
      // and bind the view properties so they effectively share a view
      map1.bindTo('view', map2);
    </script>
  </body>
</html>