For the OpenStreetMap layer, we do not need to include a script; we can access it outside of the box.
This will be pretty simple. We just need to create an OSM layer object:
var osm_layer = new OpenLayers.Layer.OSM( 'OpenStreetMap Layer' );Then, we just add the layer object to the map. Even though we're only passing in one layer object, we'll use the
addLayersfunction to keep our code consistent:map.addLayers([osm_layer]);
You should see something like this:
The map we just created is showing an OpenStreetMap layer. Unlike the previous layers, we did not have to provide an API key or link to OSM specific files—OpenLayers knows about it already. Another thing that separates the OpenStreetMap layer from the other third party map layers is that the OSM layer has no type property.