What many UI-based applications have in common, is that they need a way to let the user input data. So, collecting data from the user is a feature that most applications should have. But in a web environment, how do we collect data?

The basic method is via forms. In this chapter, we will learn how to create forms—single page, multipage, and Ajax forms. We will also learn how to validate the data submitted by the user, how to wire form fields to create relations between them, and so on.

In other words, we will learn how to get and handle data submitted by the user in different ways.