By Deepak Vohra

Asynchronous JavaScript and XML (Ajax) is an internet process used to move info among a browser and server asynchronously with out posting the internet web page to the server. "Asynchronously" means that the processing of the internet web page maintains whereas the Ajax request is distributed to the server and a reaction is acquired from the server. the net web page, or section(s) of the net web page, is refreshed with the Ajax reaction with no reposting the internet web page. Ajax has the subsequent merits over non-Ajax net applications.

- diminished reaction time and diminished server load, because the entire website isn't really reposted.

- decreased bandwidth of net purposes as purely facts is transferred and the HTML structure is utilized within the browser.

- Separation of information, layout and magnificence.

The e-book covers net seek and RSS Feed with Ajax in addition to shape validation with Ajax frameworks for Java, JSP, JSF, and Hypertext Preprocessor. It discusses utilizing Ajax in Oracle JDeveloper and is IDE dependent. JDeveloper has the subsequent merits over Eclipse IDE.

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

- It additionally presents a Hypertext Preprocessor extension.

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

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Extra resources for Ajax in Oracle JDeveloper

Example text

These()function tries a sequence of functions until one of the function runs. For example, different browsers create an XMLHttpRequest differently. these() function may be used to create an XMLHttpRequest object as shown in following listing. Request class to send an XMLHttpRequest request. Request object. Request(url,options); ajaxRequest=new The options value may be specified with a JavaScript Object Notation (JSON). Request object may be created that sends an XMLHttpRequest to a servlet url, which includes a userid parameter.

Jsp as shown in Fig. 1. 4 Configuring Prototype in AJAX Web Application 51 Fig. jsp. jsp. js” type=”text/javascript”> In the Ajax application version without the prototype library, the catalogId field is retrieved with get getElementById() function and the value is retrieved with value attribute. value; Retrieve the catalogId value with prototype function $F(). var catalogId=$F('catalogId'); 52 3 Less JavaScript with Prototype In the non-prototype version, the DOM elements are retrieved with getElementById() function.

1. Create a XMLHttpRequest object. 2. Open a XMLHttpRequest request. 3. Register a callback method to be invoked when the request is complete. 4. Send a XMLHttpRequest request. 5. Process the XML response and set HTML page content. An XMLHttpRequest request is initiated from an HTML form that has input fields for creating a catalog entry. The XMLHttpRequest is initiated from the Catalog Id field, which is required to be validated. A JavaScript function, validateCatalogId() is invoked with onkeyup event.

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