Top 15 AJAX Interview Questions ? and How to Answer Them

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 AJAX (Asynchronous JavaScript and XML) is extremely popular within the web application community for a number of reasons:

  • AJAX allows the asynchronous updating of web pages through the exchange of data with web servers in real time behind the scenes. This can be done without the need to reload the entire web page.
  • AJAX is not specifically a language per se but is a technology that facilitates communication from a client-side web page to a database server, updating the web page without reloading the entire page.
  • The result is a methodology that allows developers to create interactive web applications better and faster.
  • AJAX combines the best of Cascading Style Sheets (CSS) for presentation, XHTML for managing content, and JavaScript with the Document Object Model (DOM) for display of content.

With all these attributes of an AJAX development platform, application developers are in high demand for building high-performance, functional web pages.

Once you have honed your AJAX development skills, gaining employment as a developer means making a positive impression in a job interview (or two) based on your comprehension of AJAX techniques and your technical knowledge of the functionality.

Anticipating the top AJAX interview questions and knowing how to answer them promptly, specifically, and confidently will go a long way toward acing that interview.

Basic Interview Questions

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When you interview for an AJAX developer position, there are going to be some basic questions that any prospective employer will ask:

  • How long have you been using JavaScript and AJAX?
  • How did you learn and become proficient with AJAX ? classroom course, books, video tutorials, a combination, or employer training?
  • What do you like best about AJAX (ease of use, syntax)? ?What do you like least (debugging, learning curve)?

Be prepared to discuss your experience with AJAX openly and thoughtfully. While these questions are not overly technical in nature, they give the interviewer valuable information regarding your experience and confidence with AJAX, and may even provide insight into how you approach application development.

After you get past these basics, it?s time to pursue the more technical side of the interview.

Top AJAX Interview Questions ? and Answers

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1. Explain the concept of AJAX and its use.

2. What are advantages and disadvantages of using AJAX?

3. What is the difference between synchronous and asynchronous AJAX requests?

4. Describe how to create an AJAX request, and the process used.

5. Can you cancel an AJAX request in process?

6. What is AJAX polling?

7. What controls are used in AJAX?

8. What is the function of the UpdatePanel?

9. How many UpdatePanels can be included within a single web page?

10. What are the differences between JavaScript and AJAX?

11. What tools and technologies does AJAX utilize?

12. What is JSON, and how is it used in AJAX?

13. Are there any scenarios where AJAX should not be used?

14. How do you manage exceptions in AJAX?

15. How can you perform unit tests and debugging in AJAX applications?

After the Interview

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You may not get the first AJAX development position you interview for, but preparation is key to making the right impression on the interviewer and having the right answers to each question.

Certainly, you will not have the answer for every AJAX interview question on the tip of your tongue, so after the interview, you should think in terms not only of this interview, but of the next one.

What questions took you a bit off-guard or were totally outside your experience level? Note those questions for follow-up and be prepared with the answers for the next position you interview for.

Follow up with the interviewer within the next 24-48 hours to thank them for their time and for considering you for the position. Be sure to confirm your interest in the job. Good luck with your search for an AJAX development position.

Featured Image via Pixabay



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