Ajax in Oracle JDeveloper by Deepak Vohra

By Deepak Vohra

Asynchronous JavaScript and XML (Ajax) is an internet procedure used to move info among a browser and server asynchronously with out posting the net web page to the server. "Asynchronously" signifies that the processing of the internet web page keeps whereas the Ajax request is distributed to the server and a reaction is bought from the server. the net web page, or section(s) of the internet web page, is refreshed with the Ajax reaction with out reposting the net web page. Ajax has the next merits over non-Ajax net applications.

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

- diminished bandwidth of internet purposes as in simple terms facts is transferred and the HTML layout 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 personal home page. It discusses utilizing Ajax in Oracle JDeveloper and is IDE dependent. JDeveloper has the next merits over Eclipse IDE.

- JDeveloper 11g presents 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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Example text

For example, the following Array, catalogIds, may be created from a string that consists of Catalog Ids delimited by whitespace using the $w() function. var catalogIds=$w(“catalog1 catalog2 catalog3”); The catalogIds array may be represented as follows. 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.

A response from the server in the form of an XML DOM object provides information to the client about the validity of the catalog Id value specified. Without Ajax, the complete form would have to be posted to the server and the client JSP reloaded after a response is received from the server. The procedure to send an XMLHttpRequest request is as follows. 1. Create a XMLHttpRequest object. 2. Open a XMLHttpRequest request. 3. Register a callback method to be invoked when the request is complete. 4.

HTTP Servlet is used on the server side. 1 Introduction In the previous chapter we discussed the procedure to create an Ajax web application. The reader might have noticed that the client script included a lot of JavaScript. Prototype is a JavaScript library for developing dynamic web applications. Updater classes. 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.

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