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.
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In OpenLayers 2, opacity is a property, no need to use a function to get it :
OpenLayers.Util.getElement('opacity').value = layer.opacity;