OpenLayers allows us to read data from different origins and sources. We've seen that we can connect to a variety of services (such as WMS and WFS) and/or customize the request according to our needs (such as providing a URL directly pointing to a GML file).
We've seen that providing a URL and format type to the vector source is convenient and works for many cases. OpenLayers makes the AJAX request for us and automatically formats the response. However, there are times when we need even more control over the AJAX request and response, and this is where the
loader function comes into play.
We have chosen to use jQuery to perform the AJAX requests. The requests will pull in two separate geometry files of different formats and add them both to the same vector layer. The source code for this recipe can be found...