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jQuery interview questions

jQuery interview questions.

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  • 1.

    What is jQuery?

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  • 2.

    What is the use of jquery .each() function?

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  • 3.

    Can we have multiple document.ready() function on the same page?

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  • 4.

    What is a CDN?

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  • 5.

    Is jQuery replacement of Java Script?

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  • 6.

    How do you select element by ID in jQuery?

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  • 7.

    What is jQuery.noConflict?

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  • 8.

    Is jQuery a library for client scripting or server scripting?

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  • 9.

    Is jQuery a W3C standard?

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  • 10.

    Why do we use jQuery?

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  • 11.

    What does dollar sign ($) means in jQuery?

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  • 12.

    What is event.PreventDefault?

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  • 13.

    How JavaScript and jQuery are different?

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  • 14.

    What is the difference between .js and .min.js?

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  • 15.

    Which is the starting point of code execution in jQuery?

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  • 16.

    What does $("div") will select?

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  • 17.

    How to select element having a particular class (".selected")?

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  • 18.

    What does $("div.parent") will select?

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  • 19.

    Is there any difference between body onload() and document.ready() function?

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  • 20.

    How to create clone of any object using jQuery?

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  • 21.

    What is chaining in jQuery?

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  • 22.

    Which is fast document.getElementByID('txtName') or $('#txtName').?

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  • 23.

    What is the difference between event.PreventDefault and event.stopPropagation?

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  • 24.

    What is the difference between parent() and parents() methods in jQuery?

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  • 25.

    What is the difference between jquery.size() and jquery.length?

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  • 26.

    What is difference between prop and attr?

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  • 27.

    What is the difference between eq() and get() methods in jQuery?

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  • 28.

    What are various methods to make ajax request in jQuery?

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  • 29.

    When would you use AngularJS vs jQuery?

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  • 30.

    What are selectors in jQuery and how many types of selectors are there?

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  • 31.

    What are the fastest/slowest selectors in jQuery?

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  • 32.

    Difference between $(this) and 'this' in jQuery?

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  • 33.

    What is wrong with this code line "$('#myid\.3').text('blah blah!!!');"

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  • 34.

    How jQuery selectors are executed?

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  • 35.

    What is the difference between event.PreventDefault and "return false"?

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  • 36.

    Is there any advantage of using $.ajax() for ajax call against $.get() or $.post()?

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  • 37.

    How do you attach a event to element which should be executed only once?

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  • 38.

    In what situation you would use multiple version of jQuery and how would you include them?

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  • 39.

    What is the difference between $('div') and $(' ') in jQuery?

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  • 40.

    What are the differences between JavaScript's window.onload and jQuery's $(document).ready() method?

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  • 41.

    How does caching helps and how to use caching in jQuery?

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  • 42.

    Is there any significant difference between event.preventDefault() vs. return false to stop event propagation?

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  • 43.

    How can I get jQuery to perform a synchronous, rather than asynchronous, Ajax request?

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  • 44.

    Explain .bind() vs .live() vs .delegate() vs .on()

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  • 45.

    What are deferred and promise object in jQuery?

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  • 46.

    What is the difference between event.stopPropagation and event.stopImmediatePropagation?

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  • 47.

    Is it possible to hold or delay document.ready execution for sometime?

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  • 48.

    Is it possible to get value of multiple CSS properties in single statement?

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  • 49.

    What is the advantage of using protocol less URL while referencing jQuery from CDNs?

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  • 50.

    How can I implement my own $(document).ready functionality without using jQuery?

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  • 51.

    Can we execute/run multiple Ajax request simultaneously in jQuery? If yes, then how?

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