By Perry B. W.
The Google net Toolkit (GWT) is a nifty framework that Java programmers can use to create Ajax functions. The GWT helps you to create an Ajax program on your favourite IDE, reminiscent of IntelliJ suggestion or Eclipse, utilizing paradigms and mechanisms just like programming a Java Swing software. once you code the appliance in Java, the GWT's instruments generate the JavaScript code the applying needs.You may also use commonplace Java undertaking instruments akin to JUnit and Ant while developing GWT purposes. The GWT is a loose obtain, and you'll freely distribute the buyer- and server-side code you create with the framework. This shortcut explains tips on how to start with the GWT, after which demonstrates how you can create an easy Ajax software.
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Additional resources for Google Web Toolkit for Ajax
Sample text
Finally, The Back Button The GWT provides a way to restore the functionality of the web browser's back button in an Ajax application. Typically, the state of a single-page Ajax application is not related to the browser's back button. NOTE A single-page application is the software version of a one-act play. Since dynamic JavaScript can create web page widgets and change appearances on the fly, the web page, in terms of the physical file that the browser loads from the server, remains the same. The user can log in, manipulate buttons, lists, text fields, and other form elements, and the screen changes accordingly.
A real-world application probably wants to recreate at least a part of the application's state if the user chooses a new item on the history list. For example, your application could use the token as a key in a HashMap. Each HashMap value represents the cached state linked to the key, such as TextBox or TextArea content. Whenever the user clicks the back or forward button to reproduce a saved state, the application could check the token, get the associated value in the Map, then restore the TextBox's or TextArea's content.
All the demo application does is display the current token in a purple label on the page. getTime() function. Figure 12 shows 33 34 what the screen looks like in Firefox, including the frame showing a new list of history items, after the user has created a few new items. getTime()+""); Figure 8-7. newItem() with the new token as an argument, and finally, displays the new value in the purple label. , #1163441320000) is added to the top of the history stack. The nice thing is that GWT pays attention to when the user clicks the back or forward button, calling your onHistoryChanged() method accordingly.