Lazy Source

Example of setting a layer source after construction.

Typically, the source for a layer is provided to the layer constructor. If you need to set a layer source after construction, this can be done with the layer.setSource() method.

The layer in the map above is constructed with no source. Use the links below to set/unset the layer source. A layer is not rendered until its source is set.

source
<!DOCTYPE html>
<html>
<head>
<title>Lazy Source</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>

<style>
 button.code {
   font-family: Monaco,Menlo,Consolas,"Courier New",monospace;
   font-size: 12px;
   padding: 5px;
   margin: 0 5px;
 }
</style>
</head>
<body>
<div class="container-fluid">

<div class="row-fluid">
  <div class="span12">
    <div id="map" class="map"></div>
  </div>
</div>
<button id="set-source" class="code">layer.setSource(source)</button>
<button id="unset-source" class="code">layer.setSource(null)</button>

</div>
<script>
var source = new ol.source.MapQuest({layer: 'sat'});

var layer = new ol.layer.Tile();

var map = new ol.Map({
  layers: [layer],
  target: 'map',
  view: new ol.View({
    center: [0, 0],
    zoom: 2
  })
});

document.getElementById('set-source').onclick = function() {
  layer.setSource(source);
};

document.getElementById('unset-source').onclick = function() {
  layer.setSource(null);
};

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