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Important jQuery Interview Questions and Answers

Jquery Interview Questions and answer

1. What is jQuery?

jQuery is a JavaScript code, which involves document traversing, event handling, Ajax interactions and Animations. (Not a programming language)

2. Why jQuery is needed?

jQuery is needed for the following list:
  • Used to advance browser compatible web applications.
  • Improve the performance of an application.
  • Very fast and extensible.
  • UI allied functions are written in minimal lines of codes.

    3. Whether jQuery HTML work for both HTML and XML documents?

    jQuery HTML does not work for XML Document and it works only for HTML Documents

    4. What are the methods used to provide effects?

    Some of the effects methods are:
  • Show().
  • Hide().
  • Toggle().
  • FadeIn().
  • FadeOut().

    5. Is jQuery a JavaScript or JSON library file?

    jQuery is a library of JavaScript file and it contains DOM, event effects and the Ajax functions. jQuery is a single JavaScript file.

    6. Which operating system is more compatible with jQuery?

    The more compatible operating system with jQuery are Mac, Windows and Linux

    7. What is jQuery connect?

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

    8. Whether we need to add jQuery file in both Master and Content page?

    No, jQuery file should be connected only to the Master page and not to content page. We can enter from the content page straight without having any reference to it.

    9. What are the basic selectors in jQuery?

    Following are the basic selectors in jQuery:
  • Element ID.
  • CSS Name.
  • Tag Name.
  • DOM hierarchy.

    10. What is the use jQuery.data method?

    To connect the data with the DOM nodes and the objects and makes the jQuery code clear and concise.

    11. What are the four parameters used for jQuery Ajax method?

    The four parameters are
    URL – Need to specify the URL to send the request
    type – Specifies type of request(Get or Post)
    data – Specifies data to be sent to server
    Cache – Whether the browser should cache the requested page

    12. What is the use of jQuery filter?

    To filter certain values from the object list based on the specification.
    Example is to filter certain products from the master list of products in a cart website.

    13. What is CDN?

    CDN stands for Content Distribution network and it is said to be a group of companies in various location with network containing copies of data files to maximize bandwidth in accessing the data.

    14. How can we debug jQuery?

    There are two ways to debug jQuery:
    Debugger keyword
  • Add the debugger to the line from where we have to begin debugging and then run Visual Studio in Debug mode with F5 function key.
  • Insert a break point after attaching the process.

    15. What are the advantages of jQuery?

    Following are the advantages of jQuery:
  • Just a JavaScript enhancement.
  • Coding is simple, clear, reusable.
  • Removal of writing more complex conditions and loops.

    16. What are the types of selectors in jQuery?

    There are three types of selectors in jQuery:
  • CSS Selector.
  • XPath Selector
  • Custom Selector

    17. What is the use of jQuery each function?

    jQuery each function is used to loop between each and every element of the target jQuery object.
    It is also useful for various element DOM, looping arrays and object properties.

    18. Which is the fastest selector in jQuery?

    ID and Element are the fastest selectors in jQuery.

    19. What is the slowest selector in jQuery?

    Class selectors are the slowest selectors in jQuery.

    20. Where jQuery code is getting executed?

    on a client browser, jQuery code can be executed.
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