Time for Action – using attributions

Let's take a look at the attribution control in action.

1. To make the Attribution control useful, we must specify an attribution property on our layer objects. So, let's create a WMS layer with this property set to 'Base WMS Layer':

   var wms_base = new OpenLayers.Layer.WMS(
     'OpenLayers WMS',
     'http://vmap0.tiles.osgeo.org/wms/vmap0',
     {layers: 'basic'},
     {attribution: 'Base WMS layer'}
   );

2. Now, let's add another layer and set the attribution text to 'State Boundary'.

   var wms_state_lines = new OpenLayers.Layer.WMS(
     'State Line Layer',
     'http://vmap0.tiles.osgeo.org/wms/vmap0',
     {layers: 'stateboundary'},
     {attribution: 'State Boundary', isBaseLayer: false,
      opacity: .2}
   );

3. Finally, add the layers to the map:

   map.addLayers([wms_base, wms_state_lines]);

4. You should see something like the following, with the layer attribution text at the bottom right hand of the map:

   

What Just Happened?

You just used the attribution control with two layers containing an attribution...