Validating form using ajax

Validating web forms is a critical skill for any web developer, ensuring that the data that's submitted is complete, accurate, and nonmalicious before it's sent off to the server.Join author Ray Villalobos in this course as he shows how to validate input from site visitors with HTML5, Java Script, and j Query and then process the data with PHP.Plus, learn how to email form data and save it in a My SQL database so that it's ready for other applications.

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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.

In Ajax, the XMLHttp Request object is what provides the asynchronous communication between Web applications and underlying servers and business services.

With the XMLHttp Request object, clients may retrieve and submit XML data directly to the Web server without reloading the page.

XML data is converted to renderable HTML on the client side using DOM and Extensible Stylesheet Transformations (XSLT).

Originally introduced by Microsoft as an Active X component, XMLHttp Request is now supported by most modern browsers.

However, prior to April 2006, XMLHttp Request was implemented differently across browsers.For example, Internet Explorer 6 implements XMLHttp Request as an Active X object.As an example, suppose a user fills out a form to add data to a database table.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.Thus, a complete form does not have to be posted to the server to check if data in the form is valid.

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