[Javascript]Get coordinate from openlayers map
I would get the coordinate from an openlayers map. When I open my page I would that when I click on a button, I have received the coordinate of top bottom left and the upper right.
<html>
<head>
<title>OpenLayers Example</title>
<script src="http://openlayers.org/api/OpenLayers.js"></script>
</head>
<body>
<div style="width:100%; height:100%" id="map"></div>
<script defer="defer" type="text/javascript">
var map = new OpenLayers.Map('map');
var wms = new OpenLayers.Layer.WMS( "OpenLayers WMS",
"http://labs.metacarta.com/wms/vmap0", {layers: 'basic'} );
map.addLayer(wms);
map.zoomToMaxExtent();
</script>
<input type="button"开发者_运维技巧 text="Get Coordinate from map">
</body>
</html>
Thanks a lot.
You should use the getExtent() function of the Map object.
Returns
{OpenLayers.Bounds} A Bounds object which represents the lon/lat bounds of the current viewPort.
It will return you an OpenLayers.Bounds object, which will have the top, left, bottom and right coordinates of the current view.
I think you want to use map.getCenter() ? (this is in case you want the center coordinates of the map in lat lon, but it's not really clear what coordinate you want)
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