Event register

by _DR_

HTML

<script src="http://openlayers.org/dev/OpenLayers.js"></script>
<div id='mapdiv'></div>

CSS

#mapdiv {
    width: 600px;
    height: 600px;
}

JavaScript

loadStartListener = function() {
    alert('loadstart');
}

map = new OpenLayers.Map("mapdiv");
var ol = new OpenLayers.Layer.WMS(
    "OpenLayers WMS", 
    "http://vmap0.tiles.osgeo.org/wms/vmap0",
    {layers: 'basic'}
);
var vector = new OpenLayers.Layer.Vector({visibility: true});
vector.events.register('beforefeaturesadded','',loadStartListener);
vector.addFeatures([new OpenLayers.Feature.Vector(new OpenLayers.Geometry.Point(0, 0))]);
map.addLayers([ol,vector]);
map.setCenter(new OpenLayers.LonLat(0, 0), 2);