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In the previous sections, you learned that pointcut descriptors and advice code blocks allow an aspect to extend or modify the behavior of an application. Pointcut descriptors designate joinpoints (method calls, method executions, read operations, write operations, and so on) in the execution flow of a program, and advice code blocks add instructions before or after these joinpoints. In all cases, if no joinpoints are activated, the advice code will not be executed either. The introduction mechanism is used in AspectJ to extend the structure of an application. The term introduction refers to the process of the aspect adding code elements to the application. AspectJ can introduce, or add, six categories of these elements: fields, methods, constructors, inherited classes, implemented interfaces, and exceptions. The following sections will explain these categories in detail. Contrary to advice code, which extends the behavior of an application only when the joinpoints are executed, the introduction mechanism is unconditional the extended code is always added. AspectJ uses the term intertype declaration to refer to the introduction mechanism. The concept behind this is that an aspect, which is considered a type, declares elements (for example, fields, methods, inherited classes, and implemented interfaces) on behalf of other types in other words, on behalf of the classes of the application. No special keyword is defined in AspectJ for introduced elements, which are defined declaratively.

A powerful aspect of XMLHttpRequest Debugging is that it allows you to create a new Ajax request based on a previous request. Click the edit&replay link to open the window, as shown in Figure 7-3. Here you ll see the data listed from the request from which you started, but now all the fields are editable. You can change the request method, update the URL, add some request headers, and even add a string of data or XML that is sent along as part of the request body. Click the send link to send the newly created request. This particular tool is powerful when you want to experiment with different request types and data without having to manually update the script, deploy it to the Web server, and repeat the test. The Greasemonkey extension for the Firefox browser, combined with the XMLHttpRequest Debugging user script, is a powerful tool for Ajax debugging and development. It can help trace exactly what is happening in the browser, and if something goes wrong, you ll have the information you need to quickly debug Figure 7-3. A request from the previous the problem. It can help isolate whether example was changed to use the POST a problem exists in the browser-side client method, and the query string was moved script or in the server-side code that servfrom the URL to the request body. ices the request.

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From various product reviews to feedback forms, songs, and other media online, some variation of a Rating control is becoming common on web sites these days. These controls are often a simple manifestation of a finite rating system and usually appear as a number of stars or other small icons. The Rating control provides very similar functionality by displaying a star-based Rating control with a minimum amount of code while allowing the flexibility of applying various styles to get the intended appearance. Table 8-12 lists the main properties of this control.

An aspect that introduces fields, methods, or constructors in a class performs a declaration on behalf of this class. This declaration follows the same rules as a regular Java declaration. The name of the field or method is preceded by the name of the class that the introduction is to be performed in. Constructors are designated with the new keyword. The aspect in Listing 3-13 introduces the date field, two methods named getDate and setDate, and a constructor in the Order class. Listing 3-13. Intertype Declaration import java.util.Date; public aspect AddDate { private Date Order.date; public Date Order.getDate() { return date; } public void Order.setDate(Date date) { this.date=date; }

Sooner or later during your Ajax development you re going to have some bugs in JavaScript code. Some of the bugs will be easy to find because they re syntactic in nature. Others will be more difficult to find because they re subtle errors in business logic. That s when a debugger tool comes in handy so you can step through the code, line by line, and verify that the scripts are flowing as expected and that the variables have the correct values. You can use three tools to help you debug JavaScript: Firefox JavaScript Console: Firefox JavaScript Console records all errors and warnings that occur within JavaScript. It s easy to use, and you can quickly diagnose most errors using the JavaScript Console, without resorting to a full-fledged debugging environment. Microsoft Script Debugger: This tool integrates with Internet Explorer and provides basic debugging facilities such as the ability to set breakpoints and the ability to inspect and modify the values of variables during runtime. It s a relatively primitive tool, although it may fit nicely in situations where many Internet Explorer specific behaviors are used or where the debugging errors occur only in Internet Explorer.

Boolean value indicating whether or not postback is initiated with a change in ratings Current value of the Rating control CSS class used for empty (unselected) stars CSS class used for filled (selected) stars

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