Moveend Example

Use of the moveend event.

In this example, a listener is registered for the map's moveend event. Whenever this listener is called, it updates the inputs below with the map extent in decimal degrees.

moveend, map, event
<!DOCTYPE html>
<html>
<head>
<title>Moveend Example</title>
<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/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>

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

<div class="row-fluid">
  <div class="span12">
    <div id="map" class="map"></div>
  </div>
</div>
<label>top</label><input type="text" id="top">
<label>right</label><input type="text" id="right">
<label>bottom</label><input type="text" id="bottom">
<label>left</label><input type="text" id="left">

</div>
<script>
var map = new ol.Map({
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    })
  ],
  target: 'map',
  controls: ol.control.defaults({
    attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
      collapsible: false
    })
  }),
  view: new ol.View({
    center: [0, 0],
    zoom: 2
  })
});

function display(id, value) {
  document.getElementById(id).value = value.toFixed(2);
}

function wrapLon(value) {
  var worlds = Math.floor((value + 180) / 360);
  return value - (worlds * 360);
}

function onMoveEnd(evt) {
  var map = evt.map;
  var extent = map.getView().calculateExtent(map.getSize());
  var bottomLeft = ol.proj.transform(ol.extent.getBottomLeft(extent),
      'EPSG:3857', 'EPSG:4326');
  var topRight = ol.proj.transform(ol.extent.getTopRight(extent),
      'EPSG:3857', 'EPSG:4326');
  display('left', wrapLon(bottomLeft[0]));
  display('bottom', bottomLeft[1]);
  display('right', wrapLon(topRight[0]));
  display('top', topRight[1]);
}

map.on('moveend', onMoveEnd);

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