jQuery Interview Questions And Answers

SOOPRO Pathshala provides jQuery Interview Questions and Answers

1. What is jQuery?

It is Javascript library.

2. Why is jQuery known as a feature-rich library?

This is because jQuery has several features such as easy DOM manipulation, event handling, built-in animations, cross-browser compatibility, supports CSS3, and is lightweight.

3. In what scenarios jQuery can be used?

jQuery is used mainly to add animation effects, call functions on events, apply dynamic or static CSS, and manipulate purposes.

4. Can you select all elements using jQuery? How?

Yes, all elements can be selected using jQuery using $('*') available in a DOM.

5. What is the purpose of jQuery AJAX?

AJAX stands for Asynchronous JavaScript and XML. It helps in loading and exchanging data without a browser page refresh and only via server.

6. Does Bootstrap require jQuery?

jQuery is used for JavaScript plugins by Bootstrap. However, if we use the CSS part of Bootstrap, jQuery is not needed.

7. What are the advantages of jQuery?

jQuery is easy to use and understand, even for people with limited programming experience.
It simplifies common JavaScript tasks, such as traversing the Document Object Model (DOM), handling events, and creating animations.
jQuery is cross-browser compatible, which works well in most major web browsers.

8. How is jQuery different from other javascript frameworks?

The main difference between the two is that a library is a collection of pre-written code that you can use to perform specific tasks, while a framework is a structure in which you build your code on top.

9. Is jQuery a JavaScript or JSON library file?

jQuery is a JavaScript library file.

10. Does jQuery work for both HTML and XML documents?

Yes, jQuery can work with both HTML and XML documents.

11. What is the $() function in the jQuery library?

The $() function is an alias for the jQuery() function. It is used to select elements from the DOM and perform various operations.

12. Explain $(document).ready() function?

This function is used to ensure that the DOM is fully loaded before any jQuery code is executed.

13. What is the exact difference between the methods onload() and document? ready()?

The main difference is that onload() waits for all assets on the page to be loaded, including images and other external resources, during the document. Ready () only remains for the DOM to be prepared.

14. What is the use of the CSS () method in jQuery?

The CSS () method in jQuery is used to retrieve or set the value of a CSS property for the selected elements.

15. Which jquery method is used to hide selected elements?

The hide() method in jQuery is used to hide selected elements.

16. What are events in jQuery?

Events in jQuery are actions or occurrences in the browser, such as a user clicking a button or hovering over an element.

17. What is the significance of jQuery.length?

jQuery.length is a property that returns the number of elements in the selected jQuery object.

18. What is jQuery click event?

The click event in jQuery is triggered when a user clicks on an element. It can perform a specific action when an element is clicked.

19. Can you explain about ajaxStart() functions?

The ajaxStart() function in jQuery is a method triggered when an AJAX request is sent.

20. What is the purpose of JQuery's serialize() method?

The jQuery serialize() method converts form data into a string format that can be easily sent to a server via an AJAX request.