Limited Layer Extent

Restricting layer rendering to a limited extent.

This example uses the layer.setExtent() method to modify the extent of the overlay layer. Use the controls above to limit rendering based on an extent (approximate country bounds).

<!DOCTYPE html>
<html>
  <head>
    <title>Limited Layer Extent</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v4.6.4/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src=""></script>
    <script src="https://openlayers.org/en/v4.6.4/build/ol.js"></script>
  </head>
  <body>
    <div id="map" class="map"></div>
    <button type="button" class="btn btn-default" id="India">India</button>
    <button type="button" class="btn btn-default" id="Argentina">Argentina</button>
    <button type="button" class="btn btn-default" id="Nigeria">Nigeria</button>
    <button type="button" class="btn btn-default" id="Sweden">Sweden</button>
    <script>
      function transform(extent) {
        return ol.proj.transformExtent(extent, 'EPSG:4326', 'EPSG:3857');
      }

      var extents = {
        India: transform([68.17665, 7.96553, 97.40256, 35.49401]),
        Argentina: transform([-73.41544, -55.25, -53.62835, -21.83231]),
        Nigeria: transform([2.6917, 4.24059, 14.57718, 13.86592]),
        Sweden: transform([11.02737, 55.36174, 23.90338, 69.10625])
      };

      var base = new ol.layer.Tile({
        source: new ol.source.TileJSON({
          url: 'https://api.tiles.mapbox.com/v3/mapbox.world-light.json?secure',
          crossOrigin: 'anonymous'
        })
      });

      var overlay = new ol.layer.Tile({
        extent: extents.India,
        source: new ol.source.TileJSON({
          url: 'https://api.tiles.mapbox.com/v3/mapbox.world-black.json?secure',
          crossOrigin: 'anonymous'
        })
      });

      var map = new ol.Map({
        layers: [base, overlay],
        target: 'map',
        view: new ol.View({
          center: [0, 0],
          zoom: 1
        })
      });

      for (var key in extents) {
        document.getElementById(key).onclick = function(event) {
          overlay.setExtent(extents[event.target.id]);
        };
      }
    </script>
  </body>
</html>