Ajax on Java by Steven Douglas Olson

By Steven Douglas Olson

This functional consultant exhibits you the way to make your Java net purposes extra responsive and dynamic by way of incorporating new Ajaxian beneficial properties, together with advice lists, drag-and-drop, and extra. Java builders can choose from many alternative methods of incorporating Ajax, from construction JavaScript into your purposes "by hand" to utilizing the hot Google net Toolkit (GWT). Ajax on Java begins with an advent to Ajax, exhibiting you ways to put in writing a few simple functions that use client-side JavaScript to request info from a Java servlet and reveal it with no doing an entire web page reload. It additionally offers a number of thoughts for speaking among the buyer and the server, together with sending uncooked facts, and utilizing XML or JSON (JavaScript item Notation) for sending extra advanced collections of knowledge. The publication then branches out into diversified techniques for incorporating Ajax, which come with: The Prototype and script.aculo.us Javascript libraries, the Dojo and Rico libraries, and DWRIntegrating 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 purposes: your client-side elements are written in Java, and compiled into HTML and JavaScript Ajax provides net builders the facility to construct functions which are extra interactive, extra dynamic, extra interesting and stress-free in your clients. in case you are a Java developer and have not attempted Ajax, yet want to start, this ebook is key. Your clients should be thankful.

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SetResult(streamResult); Finally, the StreamResult is converted to a String by calling toString( ) on the StringWriter. toString( ); The String can then be returned to the calling method. Using SAX is purportedly a faster and less memory-intensive way to create XML documents than using DOM-based libraries such as JDOM and dom4j. If your testing shows that speed is an issue, or if the SAX API is more natural for your application, you should consider using it. There are other ways to create an XML document.

Fortunately, there is another way to send data to the client that is easier to parse and more compact. That alternative is JSON (pronounced Jason). JSON objects are typically smaller than the equivalent XML documents, and working with them is more memory-efficient. 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.

EndElement(null,null,"binary"); Each element is created with startElement( ), characters( ), and endElement( ). setResult(streamResult); Finally, the StreamResult is converted to a String by calling toString( ) on the StringWriter. toString( ); The String can then be returned to the calling method. Using SAX is purportedly a faster and less memory-intensive way to create XML documents than using DOM-based libraries such as JDOM and dom4j. If your testing shows that speed is an issue, or if the SAX API is more natural for your application, you should consider using it.

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