Download Ajax on Java by Steven Douglas Olson PDF

By Steven Douglas Olson

This sensible advisor exhibits you ways to make your Java internet purposes extra responsive and dynamic via incorporating new Ajaxian positive aspects, 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 hot Google internet Toolkit (GWT). Ajax on Java begins with an creation to Ajax, displaying you ways to put in writing a few uncomplicated functions that use client-side JavaScript to request details from a Java servlet and reveal it with no doing a whole web page reload. It additionally offers numerous innovations for speaking among the buyer and the server, together with sending uncooked info, and utilizing XML or JSON (JavaScript item Notation) for sending extra complicated collections of information. The e-book then branches out into diversified methods for incorporating Ajax, which come with: The Prototype and 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) purposes utilizing Google's GWT, which bargains a natural Java method of constructing internet functions: your client-side parts 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. if 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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1. JDOM One option is to use the JDOM library to write the XML. org, and put it in your application's WEB-INF/lib directory. Then, instead of writing to a StringBuffer, use JDOM to build the XML, as shown in Example 4-2. Example 4-2. Document), then an Element named root with the String "converted-values" as its value. That element becomes the root of the XML document. Here's what the document looks like at this point: To add child elements to the root, we create new elements and add them to the root element.

Value) to ensure that any special characters in the username are escaped properly. It then sends the URL to the server in an HTTPGetRequest. status == 200) { usernameCheck( ); } } } The callbackUsername( ) function is simple. focus( ); } } This is not an elegant solution, but it illustrates the basic idea. You could embellish the code by displaying the text off to the side and disabling the Signup button until the user enters a unique username, or by looking ahead as the user types and enabling the Signup button only when the entered username is unique.

ToString( ); } } 60 61 The usernames are then collected into one long comma-separated string, using a StringBuffer. The resulting string is then sent back to the client as is: no XML, no JSON wrapping. It's simple and effective. , the server has returned a result) and the request's status is 200 (success). populateUsernames( ) parses out the usernames from a comma-separated string and loads them into a JavaScript array. split(','); lookAheadArray = nameArray; } At this point, the lookAheadArray is loaded with usernames; the program is ready to interpret the characters entered into the username field and open a div if there are any matches.

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