TopoJSON example

Demonstrates rendering of features from a TopoJSON topology.

This example uses a vector layer with ol.format.TopoJSON for rendering features from TopoJSON.

topojson, vector, style
<!DOCTYPE html>
<html>
<head>
<title>TopoJSON example</title>
<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/ol3/3.6.0/ol.css" type="text/css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/ol3/3.6.0/ol.js"></script>

</head>
<body>
<div class="container-fluid">

<div class="row-fluid">
  <div class="span12">
    <div id="map" class="map"></div>
  </div>
</div>

</div>
<script>
var raster = new ol.layer.Tile({
  source: new ol.source.TileJSON({
    url: 'http://api.tiles.mapbox.com/v3/mapbox.world-dark.jsonp'
  })
});

var styleArray = [new ol.style.Style({
  fill: new ol.style.Fill({
    color: 'rgba(255, 255, 255, 0.6)'
  }),
  stroke: new ol.style.Stroke({
    color: '#319FD3',
    width: 1
  })
})];

var vector = new ol.layer.Vector({
  source: new ol.source.Vector({
    url: 'data/topojson/world-110m.json',
    format: new ol.format.TopoJSON()
  }),
  style: function(feature, resolution) {
    // don't want to render the full world polygon, which repeats all countries
    return feature.getId() !== undefined ? styleArray : null;
  }
});

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

</script>
</body>
</html>