Accelerated GWT - Building Enterprise Google Web Toolkit by Vipul Gupta

By Vipul Gupta

Ajax is an internet improvement procedure that takes benefit of JavaScript to reveal and engage dynamically with details embedded right into a online page. Its emergence has made it attainable to create net functions that heavily resemble their desktop–based brethren. With this fascinating new skill got here a number of demanding situations; not just did builders need to study JavaScript, yet they have been additionally pressured to take advantage of inefficient improvement procedures, let alone care for cross–platform and browser problems. yet with the discharge of Google internet Toolkit (GWT), Java builders may be able to proceed utilizing their favourite language to jot down robust Ajax purposes whereas utilizing not just the Java language, but in addition the exact same improvement instruments they’re already utilizing on a regular basis!
Serious Java builders eager to write Ajax purposes utilizing GWT can anticipate a fast–paced, but thorough, advent to GWT from Java specialist Vipul Gupta. You’ll achieve key insights into the GWT framework’s services and will depend upon transparent guideline that may assist you include GWT into your day-by-day improvement regimen within the most appropriate method. sped up GWT introduces you to the preferred GWT framework in a manner that would let you start utilizing GWT in brief order. Foregoing superfluous introductions to JavaScript and Ajax, you’ll as a substitute be immersed in GWT basics from the first actual bankruptcy. next chapters talk about key GWT options reminiscent of structure, widgets, and RPC. knowing you’ll are looking to successfully combine GWT into your improvement workflow, the writer additionally devotes time to sound GWT program layout, trying out, and internationalization issues.
What you’ll learn
- Use GWT’s distant technique name (RPC) functions to tremendously increase the person event via optimizing software performance.
- transcend uncomplicated syntax basics to benefit how you can so much successfully layout and try your GWT applications.
- construct complicated interfaces through profiting from GWT’s complicated widget offerings.
Who is that this booklet for?
Java–minded internet builders looking to contain Ajax services into their internet purposes with out sacrificing sound improvement rules.

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Class hierarchy for a hypothetical example In Java, you would use reflection to load a specific type of Spacecraft object, as shown in Listing 2-2. Listing 2-2. newInstance(); // where typeOfSpacecraft is a String object containing either "Orbiter" or "Lander" The various web browsers in use today have a lot of properties and methods that are proprietary and hence cause differences that need to be handled differently while writing an application supporting all these browsers. clientHeight The simplest technique that a programming framework such as the GWT could use to handle such differences is to have a common base class and override such custom behavior in customized subclasses.

Since the same origin policy does not allow JavaScript to access resources from a different domain, all the files for the GWT application must reside on the same web server. Another important implication is related to making RPC calls (which are explained in Chapter 4). The same origin policy restricts the XMLHttpRequest object to making requests outside the domain from which the page was loaded. Therefore, your GWT application cannot make requests for data to domains different from the one from which the page containing the code was originally loaded.

Qxd 12 3/27/08 3:37 PM Page 12 CHAPTER 1 ■ GWT BASICS AND A FIRST APPLICATION ■Note Even though using the listed module structure is just a recommendation, it’s advisable that you stick to the previous structure because the entire community in general is sticking to this, and your modules will therefore be more easily understandable by others. A module in GWT is simply an XML file and combines the entire configuration that your application would need in a single file. GWT modules define the entry point into the application.

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