17.1 Introduction to More Complex Pages

Once you create a basic page and add navigation capabilities, you may want to add more complex features to your pages, such as the ability to store information on a managed bean, or the ability to override declarative actions. ADF provides many features that allow you to add this complex functionality using very little actual code.

For example, the Delete button on the SRMain page was created by dragging the Delete operation for the ServiceRequest collection and dropping it as a command button. Then that Delete operation was overridden, so that when the button is clicked, it not only deletes the service request from the cache, but also commits the transaction. Additionally, the SRMain page can be accessed from a number of pages in the SRDemo application. The userState managed bean (UserSystemState.java) holds the value of the originating page. The overridden Delete operation also contains logic to access the value of the originating page so that the user navigates successfully off the SRMain page.

Read this chapter to understand:

• How to create an use a managed bean to store parameter values or flags

• How to create command components that will invoke custom methods on your application module

• How to set parameter values

• How to add logic to an operation or custom method bound to a command component