Ajax for Web Application Developers

Handling Feedback, Errors, and Warnings

In Chapter 12, “Client-Side Validation,” we created quite a powerful process of managing custom server-side errors based on database information with the ErrorManager and UserValidator objects. In this chapter, we will take what we learned about displaying these errors to the user and go a step further by focusing on all forms of messages that need to be presented to a user in an application. We will take a look at a few figures that show different ways of displaying messages to a user and how to keep them consistent across an Ajax application. We will also learn how to create a very simple dialog object in the section, “Designing with Code,” that will have a display method for custom messages of all kinds. ...