[OpenLayers-Users] Mutually exclusive layers

[Derek Watling]

I have come up with the following solution which is working great:

<script type="text/javascript">
var map, streetNumbers, erfNumbers;
...

function init() {
...
    map = new OpenLayers.Map(...);
...
    streetNumbers = new OpenLayers.Layer.WMS("Street Numbers", ...);
    ...
    streetNumbers.events.register('visibilitychanged', this, layerChanged);
    map.addLayer(streetNumbers);

    erfNumbers = new OpenLayers.Layer.WMS("Erf Numbers", ...);
    ...
    erfNumbers.events.register('visibilitychanged', this, layerChanged);
    map.addLayer(erfNumbers);
...
}

function layerChanged(layer) {
    if (layer.object.visibility) {
        switch (layer.object.name) {
            case "Street Numbers":
                erfNumbers.setVisibility(false);
                break;
            case "Erf Numbers":
                streetNumbers.setVisibility(false);
                break;
        }
    }
}

...
</script>
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