Download Ajax on Java by Steven Douglas Olson PDF

By Steven Douglas Olson

This useful advisor exhibits you the way to make your Java net purposes extra responsive and dynamic through 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 development JavaScript into your functions "by hand" to utilizing the hot Google net Toolkit (GWT). Ajax on Java begins with an creation to Ajax, exhibiting you the way to put in writing a few uncomplicated functions that use client-side JavaScript to request info from a Java servlet and reveal it with no doing a whole web page reload. It additionally provides a number of concepts for speaking among the customer and the server, together with sending uncooked information, and utilizing XML or JSON (JavaScript item Notation) for sending extra advanced collections of knowledge. The e-book then branches out into diversified ways 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) purposes utilizing Ajax with Struts Integrating Ajax into Java ServerFaces (JSF) functions 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 supplies net builders the facility to construct functions which are extra interactive, extra dynamic, extra fascinating 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 should be thankful.

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Example 5-1 presents the code to get the username and check it against the database to see whether it already exists. Example 5-1. next( )) { return true; } } catch (SQLException e) { // use log4j or handle this how you want } return false; } } The doGet( ) method intercepts the request and checks for the username parameter. The parameter is sent to the existsUsername( ) method, which checks the database and returns true if the user exists. If the user exists, doGet( ) sends the string "true" back to the user; otherwise, it sends the string "Username null".

In the servlet, we merely have to get the username from the request and query the database for a matching name. We'll keep the servlet simple by just using a JDBC connection; we won't do any connection polling, Object-Relational Mapping, or any of the other fancy tricks you'd probably see in a real application. Example 5-1 presents the code to get the username and check it against the database to see whether it already exists. Example 5-1. next( )) { return true; } } catch (SQLException e) { // use log4j or handle this how you want } return false; } } The doGet( ) method intercepts the request and checks for the username parameter.

A higher number places it on top of an element with a lower number, so our div, which has a zIndex of 2, will appear on top of a div with a zIndex of 0 or 1. opacity The transparency. This controls the extent to which the elements below it show through. A value of 1 allows nothing through, while a value of 0 effectively makes the element invisible. visibility The visibility. The value hidden removes the element from the view. We can use this setting to hide the suggestion box when it is empty and show it when there is a match.

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