Top 10 jQuery Interview Questions & Answers

September 8, 2016 by chittaranjan deo

As a candidate for jQuery (Web) development, you would definitely like to know the best possible questions you might face in your next jQuery interview. Thought the questions change from one interviewer to another, we would like to put together a set of questions considering that it is expected from you to know the correct answers to these questions.

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Question 1

What is jQuery?

Answer: ‘jQuery’ is a fast, concise cross-platform JavaScript library. The intention is to simplify the client side scripting of HTML. You need to write less code here. This is an open-source software.

*Tip: Remember, don’t forget the basics of a technology you are using. Some interviewers go from start of development till deployment while some ask random questions but they all get some words from your earlier answer to phrase their next questions, so be careful about using the right words

Question 2

What is DOM and how is DOM Manipulation simplified by jQuery?

Answer: ‘DOM’ stands for ‘Document Object Model’, which is essentially the elements on a Web page. The jQuery library made is easy to select DOM elements, traverse them and modifying their content by using cross browser open source selector engine called as Sizzle.

*Tip: You should be prepared to answer a few questions which you may feel ‘in depth’ as the interviewer will try to see whether you understand the concepts to the root level.

Question 3

What is AJAX?

Answer: ‘AJAX’ stands for ‘Asynchronous JavaScript and XML’. It is defined as the method / technique of exchanging data with a server, and updating parts of a web page – without reloading the entire page. The jQuery library helps you to develop a responsive and feature rich site using AJAX technology.

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*Tip: Since your interview is on jQuery, it will be good to relate the answer of a different question to the main topic if that’s what the interviewer is expecting

Question 4

How to get and set attributes of an element using jQuery?

Answer: Use attr() method to get the value of an attribute from the first element in the matching set.

Use attr(name, value) method to set the named attribute onto all elements in the wrapped set using the passed value.

*Tip: Never assume that no one will get to the method / code level question. There is always a possibility of someone really hands-on asking such questions.

Question 5

How to include jQuery library into your code?

Answer: The jQuery library is a single JavaScript file. It can be included within a web page by linking to a local copy or to a copy on a public server.

*Tip: The source of any function library and how to include it in your code is important for the developer to know as the related functions won’t work without that.

Question 6

What are some of the advantages of using jQuery?

Answer: Creating browser compatible web applications, improving performance of an application, fast and extensible and writing UI related functions with minimum lines of code are some of the advantages of using jQuery. Here the coding is simple, clear and reusable.

*Tip: As there are multiple web technologies developed and being developed, it is important to understand the advantages (and disadvantages) of using a particular technology.

Question 7

What is jQuery connect?

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Answer: A ‘jQuery connect’ is a plugin used to connect or bind a function with another function. Connect is used to execute function from any other function or plugin is executed.

*Tip: Plug-in is part of any language and knowledge about plug-ins makes the developer’s job easy.

Question 8

Where is jQuery code getting executed?

Answer: jQuery code is getting executed on a client browser.

*Tip: Developers are supposed to know where the code is getting executed as they have to use the right technology for right functions.

Question 9

What is CDN and can you access jQuery from CDN?

Answer: CDN stands for ‘Content Delivery Network’. It is a system of distributed servers (network) that deliver web pages and other web contents to a user based on geographic location of the user. The jQuery code can be accessed from CDN.

*Tip: It is important to know how to access different code libraries from CDN instead of downloading everything to your own servers.

Question 10

What are CSS & jQuery selectors?

Answer: In CSS (Cascading Style Sheets) selectors are patterns used to select elements you want to style. The jQuery selectors allow you to select & manipulate HTML elements based on existing CSS selectors

*Tip: Selectors are important part of jQuery coding

We hope you have got the gist of important questions which can help you prepare for your interview

All the Best!