This is Part 4 in a four-part series demonstrating how to use the
Google Web Toolkit (GWT) and XForms together to create a dynamic Web
application. Part 1 looks at the JavaScript underpinnings of each
technology. Part 2 shows how to use those JavaScript underpinnings to
start mixing the two technologies together to build the rock star
application. Part 3 refactors the application to use XForms and GWT
together. In this concluding part, we continue to refactor and improve
the rock star application. The article uses GWT version 1.4 and the
Mozilla XForms plugin 0.8. The Mozilla XForms plugin works with any
Mozilla-based Web browser, such as Firefox and Seamonkey. GWT requires
knowledge of Java technology, and Web technologies such as HTML and
CSS. This article makes heavy use of JavaScript as well. XForms makes
heavy use of the Model-View-Control paradigm, so familiarity with that
is helpful. In the article you see how to add interactive forms to
your application. These forms can use GWT to create XForms controls
that can then invoke GWT Ajax services. The response from these
services can be handled through GWT, and can in turn use JSNI to alter
your XForms model data and update your XForms UI controls. This tight
integration between GWT and XForms allows XForms to take advantage
of key features of GWT. You also see that you can localize your XForms
using GWT's localization facilities. Finally, you see one of the
lesser-known, but powerful, features of GWT: Java-style sorting.
Features like this, as well features like localization and GWT's new
image bundling, make it so beneficial to use GWT not only for new
projects, but also to enhance other projects and technologies.
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