Ajax in Oracle JDeveloper by Deepak Vohra PDF

By Deepak Vohra

ISBN-10: 3540775951

ISBN-13: 9783540775959

ISBN-10: 354077596X

ISBN-13: 9783540775966

Asynchronous JavaScript and XML (Ajax) is an online approach used to move facts among a browser and server asynchronously with no posting the internet web page to the server. "Asynchronously" means that the processing of the net web page keeps whereas the Ajax request is shipped to the server and a reaction is obtained from the server. the internet 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 next merits over non-Ajax internet applications.

- diminished reaction time and diminished server load, because the whole online page isn't reposted.

- decreased bandwidth of internet functions as merely information 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 dependent. JDeveloper has the subsequent benefits 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 help for JSF and for JDBC.

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Asynchronous JavaScript and XML (Ajax) is an internet approach used to move info among a browser and server asynchronously with no 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.

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In this section, the server side processing of the XMLHttpRequest request sent to the server is discussed. catalogId=catalogId. Variable catalogId is the value of parameter catalogId. As the FormValidationServlet is mapped to url validateForm, the servlet gets invoked. As the XMLHttpRequest method is GET, the doGet method of the servlet gets invoked. In the doGet method, retrieve the value of the catalogId parameter. getParameter(“catalogId”); To obtain data from the database, create a JDBC connection from a datasource.

The onComplete property function, or a property function representing some other state of the request, is invoked by an argument containing the XMLHttpRequest object and another argument containing the response HTTP header. 1. 1 AjaxRequest Options Property method parameters asynchronous postBody requestHeaders onLoading, onLoaded, onInteractive, onComplete Description Specifies method of HTTP request. Default value is ‘post’. Type is string. List of parameters that are sent with the HTTP request.

Request class to send an XMLHttpRequest request. Define a variable for servlet url and a variable for url parameters. Request object with the servlet url. Set the options property method to ‘get’. Specify the parameters options property and set the asynchronous property to true. Specify the callback method with the onComplete property. The XMLHttpRequest gets created and sent to the specified url. When the request is complete, the showResponse function gets invoked. The function registered with the onComplete property gets invoked with an argument containing the XMLHttpRequest object and an argument containing the HTTP response header.

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Ajax in Oracle JDeveloper by Deepak Vohra

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