Ajax on Java by Steven Olson Douglas

By Steven Olson Douglas

This useful consultant exhibits you the way to make your Java internet purposes extra responsive and dynamic by way of incorporating new Ajaxian gains, together with advice lists, drag-and-drop, and extra. Java builders can choose from many various 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, exhibiting you the way to put in writing a few easy purposes that use client-side JavaScript to request details from a Java servlet and demonstrate it with no doing an entire web page reload. It additionally offers numerous thoughts for speaking among the customer and the server, together with sending uncooked facts, and utilizing XML or JSON (JavaScript item Notation) for sending extra complicated collections of data.
The booklet then branches out into varied techniques 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) functions utilizing Google's GWT, which deals a natural Java method of constructing net functions: your client-side elements are written in Java, and compiled into HTML and JavaScript
Ajax offers internet builders the facility to construct functions which are extra interactive, extra dynamic, extra intriguing and stress-free in your clients. in case you are a Java developer and have not attempted Ajax, yet want to start, this e-book is vital. Your clients might 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.

Thanks Chapter 4. XML and JSON for Ajax Do you really need XML for an Ajax application? The previous chapter showed that you don't always need XML. In particular, if you only have one data point, XML is overkill. But the fact is, most web applications deal with multiple data points: usernames, passwords, addresses, cities, states, zip codes, etc. How will you decipher those fields when they're sent back from the server? In some cases, passing a string of delimited values may seem like the simplest approach, but using XML has advantages.

Start by initializing a StringWriter and a StreamResult. Initialize the StreamResult with the StreamWriter, then get aSAXTransformerFactory and get a transformerHandler from that. The TRansformerHandler allows you to create an XML document by starting a document and appending elements and data to the TRansformerHandler. Example 4-4 shows how it works. Example 4-4. com to register it. toString( ); } After calling startDocument( ) to begin the document, we must create the elements and add data to them.

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