Download Ajax on Java by Steven Douglas Olson PDF

By Steven Douglas Olson

This sensible consultant exhibits you the way to make your Java net functions extra responsive and dynamic by way of incorporating new Ajaxian positive aspects, together with recommendation lists, drag-and-drop, and extra. Java builders can make a choice from many alternative methods of incorporating Ajax, from development JavaScript into your functions "by hand" to utilizing the recent Google net Toolkit (GWT). Ajax on Java begins with an creation to Ajax, displaying you the way to jot down a few uncomplicated functions that use client-side JavaScript to request info from a Java servlet and exhibit it with no doing an entire web page reload. It additionally provides a number of options for speaking among the buyer and the server, together with sending uncooked info, and utilizing XML or JSON (JavaScript item Notation) for sending extra advanced collections of information. 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) purposes utilizing Ajax with Struts Integrating Ajax into Java ServerFaces (JSF) purposes utilizing Google's GWT, which bargains a natural Java method of constructing net functions: your client-side parts are written in Java, and compiled into HTML and JavaScript Ajax offers internet builders the facility to construct purposes which are extra interactive, extra dynamic, extra interesting and stress-free in your clients. if you are a Java developer and have not attempted Ajax, yet wish to start, this booklet is key. Your clients may be thankful.

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Next, we load the response from the servlet into the XML document (line 6). Now we can mine the document for the data. First we get the data between the tags. To do this, we first retrieve the XML data field information, by calling getElementsByTagName(elementName) (line 8); this function returns the array of child nodes belonging to the element (parent node) associated with the given tag. After we get the array of child nodes, we can reference the first element in the child node by calling firstChild.

You will need to be in MySQL's bin directory or have the bin directory of MySQL in your path. sql and stores it in the ZIPCODES table. The -d option deletes any rows that are already in the table. This won't have any effect the first time you import the file, but if for some reason the first attempt fails and you need to run the script again, -d will prevent duplicate rows by deleting the rows that were imported on the first run. The -u option defines the user to use when importing the rows. In this case, the user is root.

The suggestion div is set up for absolute positioning; that is, it is positioned according to fixed coordinates. js JavaScript file, based on the location of the username input field. So, the div's initial values are set in the CSS file, but the final values are set by the JavaScript functions. This strategy gives the program flexibility to adapt to changes in the HTML: the div remains anchored to the bottom of the username input field, even if that field moves around as the application grows. Figure 5-4 shows how the suggestion field looks on the screen.

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