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doesn t match GWT s requirements, the application most surely will fail You can apply some workarounds for a few problems (such as using iframes to simulate Ajax calls) but an inappropriate browser is usually a stumbling block Happily, this objection is slowly fading away, and in time you won t need to worry about this However, if you require, for example, using your application with cell phones, you might find out that many users will be locked out because of inadequacies in their browsers4 For security, GWT applications are just as prone to attacks as any JavaScript application (We will consider security aspects in 10, Working with Servers ) Using GWT won t allow you to just ignore security There are, however, some security-related enhancements coming up (to avoid some of the more common attacks) but for the time being, you should just take the same precautions as for web applications developed with any other tools5 Developers may complain that compiling and deploying is slower than with straight JavaScript This is probably trivially true (no compilation beats any compilation!) but the point here is that writing the code is slower and more bug prone with JavaScript than with Java There are fewer tools for JavaScript coding, browsers have many quirks, and your program will be full of if (isIE8) tests A solution is to use libraries such as jQuery, prototype, Dojo, or ExtJS, which wrap some of those differences internally but in this case, why not use GWT that enables you to fully forget those differences 6 Similar notions are proposed by others who simply suggest that to develop rich Internet applications, you should be directly working with JavaScript, because that s what real programmers do, and forget any alternatives! This conclusion is supported by the notion that the Java-to-JavaScript conversion should necessarily be poor (because of the differences between both languages) and that the generated code will be bulky and slow Apart from the unwarranted latter objections, the key point here is that JavaScript isn t the only problem; the differing implementations across browsers are the other big problem Real browser-independent code is quite hard to write (and larger, too) and it s difficult to ensure the application of the required discipline; you end up spending more time, and writing more code, to achieve the same results as with a few lines of Java7.

This figure shows a progress bar Notice that there is a darker area within the progress bar representing the completion status It takes up 10% of the space on the progress bar, which is equal to the number displayed in the center of the bar HTML Markup Examples Create a ProgressBar widget

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4 Android cell phones and iPhone tend to work well out-of-the-box, but that s not the rule for all current cell phones 5 In any case, note that GWT applications are neither more nor less prone to attacks than any other JavaScript website, so this shouldn t be considered a GWT-specific disadvantage but rather a fact of life as pertaining to web development 6 For more on this, read the Reveling in Constraints article by one of GWT creators, Bruce Johnson, at http://queueacmorg/detailcfm id=1572457 7 If you worry about what happens when a new browser version is released, check the answer to Will my app break when a new browser comes out in the GWT FAQ at http://codegooglecom/webtoolkit/doc/latest/FAQ_GettingStartedhtml

new dijitProgressBar({ annotate:"true", maximum:"50", progress:"35"}, dojobyId("d1"))

In this chapter, you have seen a sample application covering component libraries accessing SQL Server stored procedures, serviced components with transactional attributes, a Windows Forms application that accesses the serviced components, a Web service that is used as an entry door for the partners, a Web application that makes use of the Web service, and a second Enterprise Services application with queued components that is used to access the Web service in a disconnected manner You can consider the sample application in more detail, but this chapter has covered most of the important issues The sample application is not complete The user interfaces could be improved, and more methods could be implemented with the components However, such fine-tuning does not differ much from what you learned in this chapter; you just have to do it You can also think about extending the application with more features (for example, creating history reports for course attendees, login functionality for the Web application, registration for multiple courses, and so on)

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Figure 103 A simple password change form requires hashes and encryption to safely send the new password from the client to the server

I hope you enjoyed the journey through the technologies discussed in this book, and enjoyed and learned from the various tasks herein Throughout this book, you have learned how to develop and use serviced components by maximizing the functionality of NET Enterprise Services and related technologies NET Enterprise Services technologies have a long history in the IT world and a promising future As you learned in the last part of this book, the technology will soon evolve into a technology known as Indigo (and you will be prepared because of your in-depth understanding of Enterprise Services) To get more information and updated examples for this book, visit my Web site at http://wwwchristiannagelcom/EnterpriseServices Feedback is welcome!

Description This property contains the value of the progress It can be specified as a percentage using nn% or as an absolute number, which will be converted into a percentage of the value specified in the maximum property This property contains the upper limit of the value used to calculate the percentage of progress This property specifies the number of decimal places to show in the progress value When this property is true, the progress value is unknown and is not shown

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