Download Ajax on Java by Steven Olson Douglas PDF

By Steven Olson Douglas

This sensible consultant indicates you ways to make your Java net purposes extra responsive and dynamic through incorporating new Ajaxian positive aspects, together with recommendation lists, drag-and-drop, and extra. Java builders can choose from many various methods of incorporating Ajax, from construction JavaScript into your purposes "by hand" to utilizing the hot Google internet Toolkit (GWT).
Ajax on Java begins with an creation to Ajax, exhibiting you the way to write down a few easy purposes that use client-side JavaScript to request details from a Java servlet and demonstrate it with out doing a whole web page reload. It additionally provides a number of concepts for speaking among the buyer and the server, together with sending uncooked info, and utilizing XML or JSON (JavaScript item Notation) for sending extra advanced collections of data.
The e-book then branches out into various methods for incorporating Ajax, which come with: The Prototype and script.aculo.us Javascript libraries, the Dojo and Rico libraries, and DWR Integrating Ajax into Java ServerPages (JSP) functions utilizing Ajax with Struts Integrating Ajax into Java ServerFaces (JSF) purposes utilizing Google's GWT, which bargains a natural Java method of constructing net purposes: your client-side elements are written in Java, and compiled into HTML and JavaScript
Ajax offers net builders the power to construct purposes which are extra interactive, extra dynamic, extra interesting and stress-free to your clients. in case you are a Java developer and have not attempted Ajax, yet wish to start, this e-book is key. Your clients should be thankful.

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Append("\r\n"); This code simply sets up a StringBuffer called returnXML. ; wrap it with an appropriate XML tag; and append it to the buffer. write( ). We return a question mark (without any XML wrapping) if the key we received was null. 2. Other Ways to Build the XML Document Building an XML document by appending to a StringBuffer is a common approach, but it's far from ideal, particularly if you need to generate a large document programmatically. Fortunately, there are alternatives.

The other great benefit of JSON is that you can parse it with JavaScript's eval( ) function. You don't need other libraries, and you don't need to worry as much about cross-browser functionality. As long as your browser has JavaScript enabled and supports the eval( ) function, you will be able to interpret the data. You may still need to use XML (and now you know how), but if you have the option, there are compelling reasons to use JSON. In most cases, you will be better off with a JSON implementation.

Running the Application on Tomcat If you are running your application on the Tomcat server, you can use the Tomcat Web Application Manager (accessible through the URL http://localhost:8080/manager/html) to check whether it was deployed. The application manager is shown inFigure 4-3. As you can see in this figure, two versions of our Ajax converter have been deployed successfully and are currently running. The directory in which you installed the application becomes part of the path. Figure 4-3.

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