DevShed continues their look at handling static data in a dynamic application with the final part of the series - using the observer design pattern to handle the insertion of the static information.

I'll show you how to use a static property, along with the programmatic model dictated by the observer pattern, to implement an expandable data validation system. This task might have an immediate application in a real situation.

They show how to handle user information (as defined as properties in the creation of the user objects) and pushing that data back out into the page. The observer pattern comes into play when they go to validate the user information checking to see if it's all alphabetical, numeric or an email address.