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Thus, a complete form does not have to be posted to the server to check if data in the form is valid.In this article, you'll learn how to create a Web application using Ajax in Oracle JDeveloper 10 (10.1.3). As a J2EE developer, you're probably familiar with DOM and Java Script, but not necessarily so with XMLHttp Request.Without Ajax, the validity of data in the form is not checked until the form is submitted.With Ajax, the data added to the form can be dynamically validated as the data is added to form fields using business logic in a server application.The different values of ready State are: 0-XMLHttp Request object has been created, but not initialized. 1-The object has been created and initialized, but the send() method has not been called.2-The send() method has been called, but the status and headers are not available. Opens a HTTP request, but does not send the request.Asynchronous Java Script and XML (Ajax) is a Web development technique that combines Java Script, Document Object Model (DOM), and XMLHttp Request technologies to provide dynamic interaction between a client and server.
For example, Internet Explorer 6 implements XMLHttp Request as an Active X object.For server side processing, add a HTTP Servlet with File HTTP Servlet.Figure 1: Creating a Servlet In Mapping Information frame, specify a Servlet name, Form Validation Servlet, specify a servlet mapping URL (validate Form for example), and click on Next.The data sent with the send() method may be string, an array of unsigned bytes, or an XML DOM object.The data sent with send() method is optional and may be null.
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The JSP provides the client side of the Ajax application.