Open up the first example from this chapter. Again, we'll use Firebug.

This time, we'll demonstrate the featureadded, sketchstarted, and sketchcomplete events. Let's create three appropriate listener functions:

function feature_added(feature){ console.log('feature added', feature); };
function sketch_start(feature){ console.log( 'sketch started:', feature); };
function sketch_complete(feature){ console.log( 'sketch done:', feature); };

Now, register the feature added event:

map.layers[1].events.register('featureadded', this, feature_added);

Take a look at the map and add a feature. You should see a message after adding a point or after adding a polygon /...