ajax interview questionsAjax stands for asynchronous JavaScript and XML. Ajax is a group of related technologies that are used to display information asynchronously – that is, without reloading a page – to a user. For example, you may use Ajax to show new posts or recent comments on a web page without reloading it, which can dramatically improve user experience. Ajax was at the forefront of the Web 2.0 revolution of the mid-2000s and is widely used in websites today.

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Ajax is not a single programming language and does not owe its invention to any individual or group. Ajax came about as a result of experiments by a number of different organizations, including Microsoft and Google. “Ajax: A New Approach to Web Applications”, an article by user-experience designer Jesse James Garrett, was influential in popularizing Ajax among web developers (all would-be Ajax developers are advised to read the original article, which can be found here). By 2006, the W3C attempted to create a web standard for Ajax with the release of the first draft specification for XHMLHttpRequest.

Since Ajax does not specify any particular technology, job interviews for Ajax frequently focus on the underlying technologies (including XML, DOM, JavaScript) and how they interact both among themselves, and with page-level elements (i.e. HTML and CSS). Below, we’ll take a look at some of the most common questions asked in Ajax interviews:

1. Explain Some Common Security Issues with Ajax.

An Ajax call acts as a conduit between the user and the server. All data collected by the Ajax call is transmitted to the server in plain text. This data may often contain sensitive information such as usernames, passwords, email addresses, etc. Since the data is sent in plain text, it is extremely vulnerable to hacker attacks.

Hackers can also use Ajax to insert malicious scripts in a webpage and monitor user activity. Further, Ajax fundamentally encourages developers to create more than one server-side pages. The larger the number of server-side pages, the more entry points hackers have to gain access to secure data.

2. Which Side Controls an Ajax Interaction – Server Side or Client Side?

Establishing control in any Ajax interaction is not a black and white process. Control can either be server-side, or use a mix of server-side and client-side controllers.

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3. If You Had to Create Your Own Ajax Functionality from Scratch, What Technologies Would You Use?

This question is essentially asking us about the technologies that make up Ajax. Knowing what we know about Ajax, if we had to build Ajax functionality from scratch, we would have to learn the following technologies/languages:

Besides these technologies, a strong understanding of how HTTP requests work, especially XMLHttpRequests, is also crucial for building your own Ajax functionality. You can learn how to use Ajax with this course on building a fast loading, SEO friendly Ajax website.

4. What Are Some Disadvantages of Using Ajax on a Web Page?

5. List Some Common Ajax Frameworks.

A framework or library is a set of technologies that make it easier to develop Ajax applications. Ajax frameworks are essentially JavaScript libraries that speed up development time. Some of the more common frameworks are:

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What Ajax interview questions were you asked in your interview? Share in the comments section below!

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