Google Web Toolkit contributor : Baskar P from Media&Entertainment Vertical Initiative Team (MphasiS Software Services) What is Google Web Toolkit? Google Web Toolkit (GWT) is an open source Java development framework that lets you escape the matrix of technologies that make writing AJAX applications so difficult and error prone. With GWT, you can develop and debug AJAX applications in the Java language using the Java development tools of your choice. When you deploy your application to production, the GWT compiler translates your Java application to browser-compliant JavaScript and HTML. Here's the GWT development cycle:
1. Use your favorite Java IDE to write and debug an application in the Java language, using as many (or as few) GWT libraries as you find useful. 2. Use GWT's Java-to-JavaScript compiler to distill your application into a set of JavaScript and HTML files that you can serve with any web server. 3. Confirm that your application works in each browser that you want to support, which usually takes no additional work. Components:- The major GWT components include: 1. GWT Java-to-JavaScript Compiler Translates the Java programming language to the JavaScript programming language. 2. GWT Hosted Web Browser Allows the developers to run and execute GWT applications in hosted mode (the app runs as Java in the JVM without compiling to JavaScript). 3. JRE emulation library JavaScript implementations of the commonly used classes in the Java standard class library (such as most of the java.lang package classes and a subset of the java.util package classes). 4. GWT Web UI class library A set of custom interfaces and classes for creating widgets. Features:- Dynamic and reusable UI Components: programmers can use pre-designed classes to implement otherwise time-consuming dynamic behaviors, such as drag-and-drop or sophisticated visual tree structures, Simple RPC mechanism, Browser history management and Support for full-featured Java debugging. GWT handles all cross-browser issues for the developer such as JUnit integration, Easy internationalization, etc. The developers can mix handwritten JavaScript in the Java source code using the JavaScript Native Interface (JSNI). Support for using Google APIs in GWT applications (initially, support for Google Gears) Open-source. The developers can design and develop their application in a pure object-oriented fashion, since they're using Java (instead of JavaScript). Common JavaScript errors (such as typos and type mismatches are caught at compile time. JavaScript that the GWT compiler generates is quite obfuscated or very difficult to read, which provide the application with some security and protection of proprietary material. A number of libraries are available for GWT, by Google and third parties. These extend GWTs features. Criticism:- GWT compiles JavaScript and HTML from Java bytecode. This model will in most scenarios create much larger JavaScript and HTML than what is possible to achieve with solutions where the JavaScript Widgets handcoded from before and is thought of rather as an API than as a "compiler result". An alternative way of creating an Ajax framework with "no-JavaScript pain capability" is to think of the browser as a purely rendering mechanism for predefined widgets and send messages from the server to those widgets and vice versa. Available Widgets:- As of version 1.4 (August 2007), GWT offers several widgets: HTML primitives (Button, Radio Button, Checkbox, TextBox, PasswordTextBox, TextArea, Hyperlink, ListBox, Table etc.), PushButton, ToggleButton, MenuBar, Tree, TabBar, DialogBox, Panels (PopupPanel, StackPanel, HorizontalPanel, VerticalPanel, FlowPanel, VerticalSplitPanel, HorizontalSplitPanel, DockPanel, TabPanel, DisclosurePanel), RichTextArea, SuggestBox (auto-complete). Many common widgets not found in the GWT have been implemented in third-party libraries, such as GWTiger, GWT Widget Library, GWT Component Library, Rocket GWT, GWT-Ext etc. Further References Google Web Toolkit: http://www.openajax.org/whitepapers/Ajax%20and%20Mashup%20Security.html#Mashups Wikipedia: http://en.wikipedia.org/wiki/Google_Web_Toolkit Why delete messages? Unlimited storage is just a click away. Go to http://help.yahoo.com/l/in/yahoo/mail/yahoomail/tools/tools-08.html To unsubscribe send a message to [EMAIL PROTECTED] with the subject unsubscribe. To change your subscription to digest mode or make any other changes, please visit the list home page at http://accessindia.org.in/mailman/listinfo/accessindia_accessindia.org.in
