Top jQuery Interview Questions and Answers for 2025 Part 2 (Beginner to Advanced)
Part 2 of our jQuery Interview Questions series dives deeper into more advanced concepts. This section helps candidates strengthen their practical understanding and prepare for real-world engineering challenges.
11. What is difference between detach() and remove() method in jQuery?
Though both detach() and remove() method is used to remove a DOM element,Main difference between them is that detach() keep track of the last element detached, so that it can be reattached, while remove() method does keep reference of last removed method. This is one of the many jQuery interview question from DOM manipulation. You can also take a look on appendTo() for adding element into DOM.
12. How do you add and remove CSS classes to an element using jQuery?
By using addClass() and removeClass() jQuery methods. This can be very handy, while dynamically changing class of elements e.g. marking them inactive or active and using class ".active" etc.
13. What is main advantage of loading jQuery library using CDN?
This is slightly advanced jQuery question, and don't expect that jQuery beginners can answer that. Well, apart from many advantages including reducing server bandwidth and faster download, one of the most important is that, if browser has already downloaded same jQuery version from same CDN, than it won't download it again. Since now days, almost many public websites use jQuery for user interaction and animation, there is very good chance that browser already have jQuery library downloaded. Curious reader, please see the answer for in depth analysis.
14. What is difference between jQuery.get() and jQuery.ajax() method?
ajax() method is more powerful and configurable, allows you to specify how long to wait and how to handle error, get() is a specialization to over ajax just to retrieve some data.
15. What is method chaining in jQuery? what is benefit of using method chaining?
Method chaining is calling another method in result of another method, it result in clean and concise code, single search over DOM so better performance.
16. What happen if you return false from a jQuery event handler?
It used to stop the event bubbling up
17. Which one is more efficient, document.getElementbyId( "myId") or $("#myId)?
First one because its direct call to JavaScript engine
18. What is jQuery?
jQuery is not a programming language but a well written JavaScript code. It is a JavaScript code, which do document traversing, event handling, Ajax interactions and Animations.
19. Why jQuery is needed?
jQuery is needed for the following list:
Used to develop browser compatible web applications
Improve the performance of an application
Very fast and extensible
UI related functions are written in minimal lines of codes
20. Whether JQuery HTML work for both HTML and XML documents?
No, jQuery HTML only works for HTML documents not for XML Documents.
