Let's take a look at using the allOverlays property and not specifying a div when creating a map.
In your
init()function, let's create our map object withallOverlaysset totrueand with some controls passed in. We will also not specify an HTML element:var map = new OpenLayers.Map({ allOverlays: true, controls: [new OpenLayers.Control.Navigation(),new OpenLayers.Control.PanZoom(),new OpenLayers.Control.LayerSwitcher()] });Now, let's create a couple of layers so we can see how the
allOverlaysproperty works. We'll assume that you will add WMS layers to your maps for future examples.var wms_layer_all = new OpenLayers.Layer.WMS( 'OpenLayers WMS', 'http://vmap0.tiles.osgeo.org/wms/vmap0', {layers: 'basic'}, {} ); var wms_layer_labels = new OpenLayers.Layer.WMS( 'Labels', 'http://vmap0.tiles.osgeo.org/wms/vmap0', ...