Asynchronous JavaScript and XML or Ajax in short is a new technique used to create better, more interactive and faster web applications with the help of CSS, HTML, XML, and Java Script. It uses JavaScript and Document Object Model for dynamic content display, along with CSS, XHTML for presentation.

Basics about Ajax

Conventional applications use synchronous requests for transmitting information to and from the server. This means you fill up a form, submit it and get the direction to a new page along with new information from the server. While hitting submits, JavaScript makes a request to the server, interpreting the outcomes, and updating the recent screen. In the clear sense, users will get no idea that anything transmitted to the server.

XML is typically used as the format to receive server data. Though, any format can be used such as plain text. Natural and intuitive user interaction is another vital feature of Ajax. You don’t need to click, as mouse movement is enough to trigger events. This web browser technology is independent of web server software. Users can keep using the application when the information of the client program requests from the server in the background.

Most viable RIA technology

Ajax is undoubtedly the most usable RIA (Rich Internet Application) technology so far. It is acquiring outstanding industry momentum, and over time, multiple frameworks and tool kit is emerging. Though, it is essential to mention that browser incompatibility can be an issue with Ajax and since JavaScript supports it, maintain and debugging becomes a bit difficult.

Why you should use Ajax?

If you are interested in working with Ajax, make sure you have a good knowledge of JavaScript. Ajax is not hard, and one can easily implement it in a meaningful manner. It reduces the traffic on the server in both side requests, and also responsible for decreasing the time consumption on both side responses.

XML Http request plays a vital role in the web development technique with Ajax which is designed by Microsoft and considered as special JavaScript object. It transfers data both side and make requests to the non-Ajax pages.

Ajax is designed for making asynchronous call to web servers. It means client servers don’t need to wait for the data arrive before the rendering starts. Form validation is the most significant benefit of using Ajax. Forms are common component in web page. Validation needs to be proper and instant. Ajax provides the developers with all of that and even more.

There is no need for completely reloading the page again. Ajax enhances the performance and speed. Data fetching from database and data storing into database happens in the background without reloading the page.

Open standards that Ajax is based on

  • Presentation is browser based using CSS (Cascading Style Sheets) and HTML
  • Data is stored and fetched from the server in XML format
  • XMLHttpRequest objects are used in the browser to fetch behind-the-scenes data
  • Use of JavaScript for making everything happen

Ajax works in combination with different technologies like JavaScript, CSS, DOM, and XMLHttpRequest for creating interacting web pages. But, unfortunately not all the browsers available can support Ajax which means they don’t support the creation of JavaScript and XMLHttpRequest object.

Pros in brief

  • Enhanced user experience
  • Decreased network load and server hits
  • Neutrality of platform and architecture
  • Asynchronous processing
  • Support of multibrowser
  • Quick page rendering and enhanced response times


Do you see yourself as a successful web developer in the future? Are you looking for your dream job? Well, study and practice are the only way to success. If you are about to face an interview in a company you have been dreaming to enter, make sure you are prepared and confident. Get acquainted with all the possible Ajax interview questions, and have their right answers to impress the interviewer and secure your position in that company as a deserving employee.

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