<!DOCTYPE html>
<html>
<head>
<title>Moveend Event</title>
<link rel="stylesheet" href="https://openlayers.org/en/v4.0.1/css/ol.css" type="text/css">
<!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
<script src="https://openlayers.org/en/v4.0.1/build/ol.js"></script>
</head>
<body>
<div id="map" class="map"></div>
<label>top</label><input type="text" id="top">
<label>right</label><input type="text" id="right"><br>
<label>bottom</label><input type="text" id="bottom">
<label>left</label><input type="text" id="left">
<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>
