Ajax on Java by Steven Olson Douglas

By Steven Olson Douglas

This functional consultant exhibits you the way to make your Java net purposes extra responsive and dynamic via incorporating new Ajaxian positive factors, together with advice lists, drag-and-drop, and extra. Java builders can choose from many alternative methods of incorporating Ajax, from development JavaScript into your purposes "by hand" to utilizing the recent Google net Toolkit (GWT).
Ajax on Java begins with an creation to Ajax, displaying you ways to write down a few easy functions that use client-side JavaScript to request info from a Java servlet and demonstrate it with no doing an entire web page reload. It additionally provides numerous suggestions for speaking among the customer and the server, together with sending uncooked info, and utilizing XML or JSON (JavaScript item Notation) for sending extra complicated collections of data.
The ebook then branches out into varied 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 deals a natural Java method of constructing internet purposes: your client-side elements are written in Java, and compiled into HTML and JavaScript
Ajax supplies internet builders the power to construct functions which are extra interactive, extra dynamic, extra interesting and relaxing to your clients. in case you are a Java developer and have not attempted Ajax, yet want to start, this publication is vital. Your clients should be thankful.

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Example 4-9. com to register it. com to register it. 5. 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.

1. The Character Decoder The example in this chapter is similar to the one in the previous chapter, but instead of the server returning one data point, it's going to return five. Retuning a small collection of data shows what happens when you go beyond a single data point and illustrates why most Ajax applications need XML or some other way to structure the data that is passed from the server to the client. Figure 4-1 shows how the user interface of the application will look when we're done. The design is simple enough: we send a character to the server using XMLHttpRequest( ) , and the server responds with aString containing the five conversions in XML format (decimal, octal, hexadecimal, binary, and HTML).

We don't want anything complex, so we'll aim to create an XML document that looks like this: 97 0x61 0141 &0x61; 1100001B With this format, the browser can use its document object model (DOM) parser to index and retrieve the data. There are many ways to create this XML document. For the sake of simplicity, we'll first use a StringBuffer to wrap the data with XML tags.

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