Wednesday 25 April 2018

JQuery Interview Question

1. 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.
2. 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
3. Whether jQuery HTML work for both HTML and XML documents?
No, jQuery HTML only works for HTML documents not for XML Documents.
4. What are the methods used to provide effects?
Some of the effects methods are:
  • Show()
  • Hide()
  • Toggle()
  • FadeIn() and
  • FadeOut()
5. What is the advantage of using minimized version of jQuery?
Efficiency of web page increases when minimized version of jQuery is used.min.js file will be more than 50% less than the normal js file. Reduction in the file size makes the web page faster.
6. Is jQuery is a JavaScript or JSON library file?
jQuery is a library of JavaScript file and it consists of DOM, event effects and the Ajax functions. jQuery is said to be a single JavaScript file.
7. Which operating system is more compatible with jQuery?
Mac, Windows and Linux are more compatible with the jQuery.
8. How can we include jQuery library in ASP.Net project?
Download the jQuery library from jQuery.com and include that reference in the asp.net page.
9. Which command will give a version of jQuery?
The command $.ui.version returns jQuery UI version.
10. In what scenarios jQuery can be used?
jQuery can be used in following scenarios:
  • Apply CSS static or dynamic
  • Calling functions on events
  • Manipulation purpose
  • Mainly for Animation effects
11. What is the difference between find and children methods?
Find method is used to find all levels down the DOM tree but children find single level down the DOM tree.
12. What is jQuery connect?
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.
13. How to use connect?
Connect can be used by downloading jQuery connect file from jQuery.com and then include that file in the HTML file. Use $.connect function to connect a function to another function.
14. What are the features of jQuery, has been used in web applications?
jQuery uses features like Sliding, File uploading and accordian in web applications.
15. What are the browser related issues for jQuery?
Browser compatibility of jQuery plugin is an issue and needs lot of time to fix it.

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