[GIS] How to record a base layer change event in OpenLayers

Question

The OpenLayers.Control class possesses an eventListener property which could be used in the layer switcher control. I am not sure how to make use of it to detect a base layer change event so that I can store the variable name of the chosen layer to be used subsequently when the user navigate back to the map page. Can anyone give me some hints?

Answer 1

You can check this link and view page source: Events Example

I think it has exactly what you want.

function mapBaseLayerChanged(event) {
    log(event.type + " " + event.layer.name);
}

map = new OpenLayers.Map('map', {
        eventListeners: {
            "moveend": mapEvent,
            "zoomend": mapEvent,
            "changelayer": mapLayerChanged,
            "changebaselayer": mapBaseLayerChanged
    }
});