OpenLayers Get Opacity

Question

I understand how to set opactity to a map layer in OSM but how do you get the opacity?

Perhaps something like

layer.getOpacity()

OpenLayers.Util.getElement('opacity').value = layer.???

I have tried different combinations without success.

Answer 1

In OpenLayers 2, opacity is a property, no need to use a function to get it :

  OpenLayers.Util.getElement('opacity').value = layer.opacity;

cf http://dev.openlayers.org/docs/files/OpenLayers/Layer-js.html