This article will discuss some of the most common questions in Ajax interviews to give you the upper hand if you are looking for any AJAX-related job. Note that these will mostly be technical, and therefore, adequate technical preparation is crucial. Consider the following recommendations:
1. What Is AJAX?
2. What Are Some Of The Technologies That Make Up AJAX?
3. What Do You Mean By A Synchronous Request?
AJAX supports both synchronous and asynchronous requests. The synchronous request waits for the server to respond before proceeding with the script execution. The execution, therefore, stops until a response is communicated. It is the opposite of an asynchronous request where the process continues without a reply from the server, preferring to handle the reply after arrival. Remember, these two requests are normally used based on the request priority of a web service request. The careful configuration ensures that the server can respond to a user based on the provided commands.
4. Have You Used AJAX With Other Languages?
Yes. AJAX does not work independently, which may explain why it is popular among developers and software engineers. It works perfectly with JAVA, one of the most popular programming languages. Developers can easily use the Java Enterprise Edition to create related consumer pages and respond to incoming requests. JAVA can also join AJAX customers in corporate settings and conduct several server-aspect manipulations targeting AJAX customers.
5. What Do You Understand By An AJAX Event?
AJAX events are the different unique occasions or occurrences generated by AJAX requests. You are free to choose what to subscribe to based on your wants and preferences. There are two main events under this, namely local and global events. You can easily subscribe to the former inside the Ajax request object since they function as callback. However, global events are only triggered on the document for anyone listening.
7. How Will You Advise Someone Interested In Improving Their AJAX Performance?
There are several ways to improve call performance in AJAX. One should first reduce the number of AJAX requests before carefully picking the event that triggers the AJAX request. Other hacks include using GET requests correctly, reducing the quantity of data relays and enhancing data security through caching. Your AJAX performance should improve drastically, allowing you to send and receive requests faster.
8. Mention Some Of The Common Features Of AJAX
9. Can You Mention Some Of The Advantages Of AJAX.
AJAX offers an array of advantages in web development. First, it reduces bandwidth use when retrieving and storing data from a background database saving users from reloading the page. It also supports instant form validation, which gives it an edge over its counterparts. Other advantages include reduced latency-response time during request and response, which improves efficiency and asynchronous calls that can be made to the server saving a client from waiting for data before it is rendered. Lastly, AJAX has a highly functional and useful XMLHttpRequest object that helped in specific data transfer without the necessary page reload.
10. AJAX Also Has several Disadvantages. Mention Them.
11. You Have Repeatedly Mentioned XML HTTP Requests. Can You Explain More About Them?
12. Mention The Different Methods Used In XML HTTP Request
There are six XMLHttpRequest methods that every AJAX user should be aware of. These include abort(), which cancels an ongoing request, send(content), which sends a request to the server and open(method, URL), which consists of several important parameters such as DELETE, HEAD, GET, POST and PUT used as methods. The URL part of this method refers to the request’s address. We also have the getAllRespinseHeaders(), which returns all the HTTP headers as a string and the setRequestHeader(label, value), which adds the label-value pair to the HTTP header.
13. Tell Us More About The Open() Method On AJAX
The Open() method in the XMLHttpRequest object is normally used when initializing a new or existing request. It users different request methods, optional attributes and URLs. These include open(method, URL), which contains POST, HEAD, DELETE, PUT and GET used to make RESTful requests. Open(method, URL, async) points out how the request should be handled after receipt by the server. A true value means that no response is needed before script execution, while a false value indicates that the script must get a response before moving to the next step.
14. How Would You Explain The AJAX Callback Function To A Colleague?
15. How Does AJAX Work?
16. AJAX, Like Any Other Set of Technologies, Is Vulnerable To Security Threat. Can You Mention Some Of The Security Threats Related To The AJAX Code?
Several security threats exist whenever the AJAX code is used in the webpage. These include insecure access to the database since AJAX request calls exist in plain text formats, easier access and viewing of the data retrieved from the server as it is stored on the client browser and potential misuse of the whole AJAX code by hackers during cyber attacks as it can be easily seen through the vore page source. Monitoring of browsing sessions using scripts also poses a big security threat.
17. Mention The Most Common AJAX Frameworks
18. What Would You Tell A Client Who Complaints Of His Inability To Use AJAX?
19. What Pushes Organizations And Developers To Use AJAX?
Most people and organizations use AJAX because of its advantages. However, it also has several basic goals that can easily align with users’ goals. These include: To reduce the network load, come up with and uphold an interactive user interface, offer a server and client-side framework, allow platform and AR Hite true neutrality and finally to support both asynchronous and synchronous communication. A user who wants to enjoy such functions will resort to using AJAX.
20. Have You Ever Experienced Any Usability Problems When Using AJAX?
21. What Do You Need to Cime Up With Your Own Ajax Functionality?
22. Can You Mention Renowned Applications That Use AJAX.
AJAX is pretty popular, which can be easily seen from the number of renowned applications using it. Out of all the popular websites and applications using this set of technologies, Twitter, Google Plus, YouTube, Instagram, Google Maps and Facebook are the most common. Remember, applications such as Twitter and Facebook allows you to get new information or feeds without reloading the pages, which also applies to YouTube. You don’t have to reload the whole page to play a new song or randomly access a video.
There is no particular recommended return type in AJAX. Your choice will depend on what you want to achieve or the surrounding situations. Even though most people prefer XML, given that it is represented in the acronym AJAX, you can use whatever you want. You can promptly free server-based or generated HTML fragments into a file or use an API to download or parse XML content from RESTful services. As for plain text, sever generated textual content if filed and relayed while JavaScrip allows you to create items at the client-side through its rival() feature.
24. When Are You Free To Start?
I recently cleared from my former workplace, so I am ready to start working here as soon as possible. Most of my things are in order, plus I live right across the block and would not, therefore, need some time to make arrangements for accommodation. I can therefore start coming to work as early as next week if this interview turns out successful. However, I am also highly flexible and will work with your timelines. I hope that you will communicate soon.
25. How Will You Deal With The Pressure That Comes With This Job?
I believe that the pressure associated with coding fuels me to be at my best. I have learnt that I work well under pressure and will easily put my best foot forward to succeed at this job if given a chance. However, I also prefer prior planning and will list what needs my attention at the start of the day, beginning with the most pressing ones first and working within the set deadlines. I am positive that I will easily handle the pressure of this job. I am also not shy to ask for help where necessary.
These 25 questions are frequently asked in AJAX interviews. Ensure that you prepare well in advance and research some of AJAX’s most challenging topics to increase your chances of landing a job. We wish you all the best.