This module covers the important technique of marking rows in a data model as belonging to a particular user. With this information we can decide who can edit or view particular rows. We look at how we can use Django with object-oriented Python to build a reusable "owned rows" feature.

As we begin to add interactive elements to our web pages, we need to learn JavaScript. For students with a JavaScript background this will be a bit of review as we learn JavaScript from a Django perspective.

The Object-Oriented approach in JavaScript is different from Object Orientation in Python in some important ways. So we look at the unique features of the OO pattern in JavaScript. The high level concepts are the same between Python and JavaScript but the implementation details are different in important and subtle ways.

We look at particular aspects of the JavaScript run-time in a browser including manipulation of the Document Object Model(DOM), timers and event handling.

The more advanced data modeling approach to remove replication of string data is the Many-To-Many data model. Sometimes a one-to-many model is not flexible enough to represent structures like course rosters. A Many-to-many model in essence models two on-to-many relationships.

JSON and AJAX allow web pages to add interactivity and interact with the back-end without sending entire web pages back and forth to the server.

In this module we extend our application to add search to our classified ads application.