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requires that you understand Dynamic HTML. I highly recommend that all Ajax developers purchase the book Dynamic HTML: The Definitive Reference by Danny Goodman (O Reilly Media, 2002). It is a thick book, but it provides answers to all browser issues what works and does not work. The second ramification is that all content should be referenced by using REST URLs. If REST is not used, then referencing the data within the brown areas of Figure 2-1 will result in using remote procedure calls (RPCs). Using RPCs is not recommended, because additional overhead is required, such as method name encoding, parameter encoding, and data decoding. Programmers may like using RPCs, but they are intended for classical programming techniques and not for Ajax or Internet applications.3 The third and final ramification is that to keep things simple. It is possible to reference other websites, but that will introduce security issues that will need to be resolved. For example, using Internet Explorer to make the domain trusted where the HTML page was downloaded allows XMLHttpRequest to download content from other domains. Keeping things simple includes using techniques that work across all browsers on all platforms. It is possible to do more neat and cool tricks, but those tricks need to be maintained and extended. It is important to understand these ramifications because they define from an architectural perspective our boundaries on what patterns and best practices can and cannot be applied.

The second handler will be used by the testButtonClickSequence method. Therefore, check that the button label was changed.

private function handleButtonClickSqEvent( event:*, passThroughData:Object ):void { Assert.assertEquals(passThroughData.buttonLable, btn.label); } }

Summary

Table 2-1 defines the methods. Regardless of how the XMLHttpRequest type is instantiated, and regardless of which browser

As you can see from the preceding example, you can now test visual appearance as well as visual behavior in FlexUnit 4, which can help greatly when creating GUIs. That said, although you can test a GUI with FlexUnit 4, we recommend an open source tool called FlexMonkey (http://code.google.com/p/ flexmonkey/) to perform more complex testing.

FlexUnit and TDD go hand in hand. TDD is a software development technique, and we can use FlexUnit 4 to implement the technique. The methodology started by programmers adding a test to their code after writing it. In 1999, Extreme Programming (XP) talked about development of dynamic projects with changing requirements and a development cycle that includes TDD for writing the test before the code itself. Note that TDD is not the complete development cycle, but only part of the XP development paradigm. By preparing the tests before writing the code, it allows you to show the work in small steps rather than have the customer wait for the complete result. Moving in small increments at a time allows your customers to make changes before writing final code as well as ensuring that things do not go wrong and your code does what it needs to do and nothing more. It is important to mention that the focus of the TDD technique is to produce code and not to create a testing platform. The ability to test is an added benefit. TDD relies on the concept that anything you build should be tested, and if you are unable to test it, you should think twice about whether you really want to build it. XP uses the concept of TDD techniques using a short development process every couple of weeks called Iteration Planning which is based on user stories (see the following example). Iteration Planning contains the user stories and consists of the code necessary to pass that test. Once the test is completed, the code gets refactored to remove any extra code and create cleaner code. At the end of iteration planning, the team delivers a working application.

A user story is a term used to represent a business requirement. The customer explains the requirement to the software engineer, and all those business requirements are user stories which together are part of the specification of requirements. For instance, once the user logs in, a welcome window pops up.

In this chapter you ve seen how Java Micro Edition works, how it s implemented, and where it fits in the Java universe. Then we ve covered what you need to do in order to set up your development environment and to write an actual program and get it installed and running on your handset. Now that you ve finished these steps, you re ready to write some real games!

An HTTP redirection, whether executed by the web browser or XMLHttpRequest, can be executed only if the redirection follows the same origin policy. If a redirection to another domain is attempted with XMLHttpRequest, the results vary. For example, Microsoft Internet Explorer returns a status code of zero and no further data, Mozilla-based browsers return the status code 302 and the redirected URL, and finally Apple Safari crashes. Note that at the time of this writing, the Safari bug has been filed.

Let s explore the TDD technique, as shown in Figure 1-12. 1. Add test. The first step is to understand the business requirements (which turn into User Stories) and think of all possible scenarios. In case the requirements are not clear enough,