Download Ajax in Oracle JDeveloper by Deepak Vohra PDF

By Deepak Vohra

Asynchronous JavaScript and XML (Ajax) is an online procedure used to move facts among a browser and server asynchronously with no posting the internet web page to the server. "Asynchronously" signifies that the processing of the net web page keeps whereas the Ajax request is distributed to the server and a reaction is got from the server. the net web page, or section(s) of the net web page, is refreshed with the Ajax reaction with out reposting the internet web page. Ajax has the subsequent benefits over non-Ajax internet applications.

- decreased reaction time and lowered server load, because the entire online page isn't reposted.

- lowered bandwidth of net purposes as basically info is transferred and the HTML layout is utilized within the browser.

- Separation of information, layout and magnificence.

The publication covers net seek and RSS Feed with Ajax in addition to shape validation with Ajax frameworks for Java, JSP, JSF, and personal home page. It discusses utilizing Ajax in Oracle JDeveloper and is IDE established. JDeveloper has the next merits over Eclipse IDE.

- JDeveloper 11g presents an built-in JavaScript Editor for Ajax/Web improvement.

- It additionally presents a personal home page extension.

- JDeveloper has a integrated help for JSF and for JDBC.

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Updater is evalScripts, which indicates if scripts shall be evaluated when the response is received. Default value of evalScripts is false. Updater to update a form element, userid, with the response HTML. Updater class and is used to update a form element periodically. The frequency with which the element is updated is specified with the frequency option. Updater. For example, update a validationMessage div periodically. 3 Installing Prototype We shall be using the same application that we developed in the previous chapter and add prototype functionality to the user interface.

Click on OK in Project Properties window as shown in Fig. 9. Fig. 9 Adding a Library The Ajax web application in this chapter retrieves data and updates data in an Oracle database table. Install Oracle 10g database including the sample schemas and a database instance ORCL. Create a database table with SQL script listed below using SQL client SQL Plus or in command line. Catalog VALUES('catalog3', 'Oracle Magazine', 'Oracle Publishing', 'March-April 2005', 'Starting with Oracle ADF ', 'Steve Muench'); 26 2 Developing an Ajax Web Application Next, define a JDBC Connection with the Oracle database in the Databases window.

In a previous chapter we developed an Ajax application to validate an input form. The same application could be developed with the Prototype library, as we shall discuss in this chapter. 2 Overview of Prototype The Prototype library provides various utility functions to reduce JavaScript code, and provides Ajax classes to send an XMLHttpRequest request. Prototype also provides functions for DOM processing, form processing, and event processing. We shall discuss the main Prototype functions and classes next.

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