You know that sinking feeling when an interviewer casually drops "So, tell me about jQuery..." and your mind goes completely blank?

I still remember my first Meta coding interview where the engineer asked me to explain event delegation in jQuery. I knew the concept cold from countless hours of practice, but sitting there with three pairs of eyes on me? My brain decided to take a vacation. I fumbled through something about bubbling and capturing, probably sounded like I was making it up on the spot.

Here's what I've learned after landing offers at Amazon, Meta, and TikTok: jQuery questions aren't testing your ability to memorize documentation. They're testing how you can explain complex concepts under pressure while writing clean, working code. Most candidates crash and burn on the simple stuff—they'll nail the theory but then write $(document).ready() when they meant $(window).load().

I'm going to walk you through the exact functions that show up in 90% of jQuery interviews: .ready(), .on(), $.ajax(), method chaining, DOM traversal, event delegation, callbacks, deferred objects, and promises.

Look, I wish I'd had InterviewCoder's AI coding assistant back then. It runs silently during your interview, feeding you live code examples and debugging hints right when you need them. While other candidates are frantically trying to remember syntax, you're staying calm because you've got real-time backup.

28 Essential jQuery Interview Questions

1. What does this selector do?

$( "div#first, div.first, ol#items > [name$='first']" )

What it selects and why

div#first → the <div> with id first
div.first → all <div> elements with class first
ol#items > [name$='first'] → direct children of <ol id="items"> whose name ends in first

jQuery combines them into one collection, so you can apply changes in one pass.

2. Why doesn’t this click handler work on new buttons?

$("button").bind("click", function() {

alert("Button Clicked!");

});

Direct binding vs delegation

.bind() only attaches to elements that exist when the code runs.
New buttons added later won’t trigger the handler.

Fix with delegation:

$(document).on("click", "button", function() {

alert("Button Clicked!");

});

Now the document listens for clicks and applies the handler to any button, even ones added later.

3. How do I select elements with IDs ending in a string?

Attribute ends-with selector

$("[id$='txtTitle']") // any element ending with txtTitle

$("div[id$='txtTitle']") // only <div> elements ending with txtTitle

The $= operator matches the end of an attribute value.

Q4. What’s the $ in jQuery, and how do you avoid conflicts?

$ is just a shortcut for the jQuery function.
$(selector) is the same as jQuery(selector).

Two ways to avoid conflicts:

Release $

$.noConflict();

jQuery("div").hide();

Use a closure

(function($){

$("button").click(function(){ /* ... */ });

})(jQuery);

5. Animate a div from 100×100 to 200×200 over 3s

$("#expander").animate({

width: "200px",

height: "200px"

}, 3000);

Why it works: animate() transitions CSS properties over time in ms.

6. What is method chaining?

Chaining works because most jQuery methods return the jQuery object itself.

Example

$("#play-movie")

.on("click", playMovie)

.css("background-color", "orange")

.show();

Upside: less code, fewer DOM lookups.

7. Explain this code

$("div").css("width","300px").add("p").css("background-color","blue");

Step by step

Select all <div>

Set their width

Add all <p> to the selection

Set the background for both groups

.add() expands the selection for chained calls.

8. Which is faster?

document.getElementById("logo"); // native

$("#logo"); // jQuery

Answer: getElementById is faster because it returns the element directly. jQuery adds parsing and wraps the result in an object. Use jQuery only if you need its utilities.

9. Difference between event.preventDefault() and event.stopPropagation()

preventDefault() → blocks the browser’s default behavior.
stopPropagation() → stops the event from bubbling up to parents.

Example

$("#inner").click(function(e){

e.preventDefault(); // stop link navigation

e.stopPropagation(); // stop parent’s handler

});

10. What happens if you return false?

jQuery handler: does both preventDefault() and stopPropagation().
DOM onclick on <a>: prevents navigation + stops bubbling.
DOM onclick on non-link: often does nothing reliable.

11. How does .clone() work?

Deep copy → duplicates element + children.
Not included by default → events and jQuery data.
Options:

.clone(true, true) // copy events + data too

Gotcha: IDs are cloned, so you may end up with duplicates.

12. What does .promise() do?

It waits for queued actions (like animations) to finish before running code.

Example: fading out 5 divs staggered 2s apart. The .promise().done(...) runs only after the last fade completes, about 10s later.

13. How to remove an element before its Promise resolves?

Use .detach() instead of .remove().

.detach() → takes it out of the DOM but keeps data/events.
After the promise resolves, call .remove() to clean up.

14. .detach() vs .remove()

.detach() keeps data + handlers → good if reinserting.
.remove() deletes everything, including events/data.

15. document.ready() vs window.onload

ready() → runs once DOM is parsed.
onload → waits for all resources (images, CSS, etc.).

Use ready() for DOM work, onload if you depend on external files.

16. prop() vs attr()

$("#cb").attr("checked"); // original HTML attribute

$("#cb").prop("checked"); // current state (true/false)

Use prop() for boolean states; attr() for static markup values.

17. Another view on prop() vs attr()

attr() → what’s in HTML.
prop() → the live property on the element.

Attributes are static; properties can change as the user interacts.

18. How to use jQuery in ASP.NET?

Include the jQuery script.
Reference server controls via ClientID.

$("#<%= Button1.ClientID %>").click(function(){

alert("Welcome jQuery!");

});

Or set ClientIDMode="Static" to avoid renaming.

19. Hide a div on button click

<div id="div1">jQuery is a great library.</div>

$("#btnHide").click(function(){

$("#div1").hide();

});

20. What is jQuery UI Datepicker?

A calendar plugin you attach to inputs.

$("#Datepicker").datepicker({

dateFormat: "dd/mm/yy",

changeMonth: true,

changeYear: true

});

21. Scroll a multiline ASP.NET textbox

$("#btnScroll").click(function(e){

e.preventDefault();

var $txt = $("#<%= TextBox1.ClientID %>");

$txt.animate({ scrollTop: $txt[0].scrollHeight }, 1000);

});

22. Define .animate()

Transitions numeric CSS properties over time.

$("img").hover(function(){

$(this).animate({ height: 300 }, "slow")

.animate({ width: 300 }, "slow");

});

23. Difference between .bind() and .live()

.bind() → attaches directly to existing elements.
.live() → delegated at document level (deprecated).

Modern: use .on() for both direct and delegated cases.

24. What is jQuery UI Sortable?

Adds drag-and-drop reordering to lists.

$("#sortable").sortable({

placeholder: "ui-state-highlight"

});

25. What are fade effects?

fadeIn() → show by fading in
fadeOut() → hide by fading out
fadeToggle() → toggle fade state
fadeTo() → fade to a set opacity

26. What is .queue()?

Manages a sequence of functions on an element.

$("#box").queue(function(next){

$(this).css("background","red");

next();

}).animate({ left: 100 }, 400)

.delay(500)

.animate({ left: 0 }, 400);

27. How are jQuery selectors executed?

They’re CSS selectors under the hood.

$("div") // all divs

$(".class") // elements with class

$("#id") // element with id

jQuery uses querySelectorAll or its own engine (Sizzle) when needed.

28. How can you use arrays with jQuery?

Use normal JS arrays, but jQuery has helpers.

var names = ["Alice","Bob"];

$.each(names, function(i, val){

console.log(i + ": " + val);

});

You can still push, splice, and loop with plain JavaScript.

How to Stay Calm When the Real Interview Starts

Reading through questions like these builds your base, but let’s be honest, interviews feel different when you’re on the spot. That’s where I almost blew my first FAANG screen. My mind went blank, my hands were sweaty, and I knew the syntax but couldn’t get the words out.

That changed when I started using InterviewCoder. It runs quietly during your interview, feeding you live answers, debugging tips, and clear explanations while you focus on communicating with the interviewer. It’s like having a co-pilot who never gets nervous.

Ready to walk into interviews with backup? Download InterviewCoder today and get live help that makes the toughest coding screens feel manageable.

Top 42 Basic jQuery Interview Questions for Freshers

1. What is jQuery, and why do interviewers still ask about it?

A compact library that simplifies DOM work and Ajax

jQuery is an open-source JavaScript library that makes DOM, event, animation, and Ajax tasks easier with short method calls.

$(function() {

$("p").css("color", "red");

});

</script>

This code waits for the DOM, selects all <p> tags, and sets them red. Teams still ask about jQuery because its patterns (selectors, chaining, delegation, Ajax) are fundamentals that apply to frameworks and plain JavaScript today.

2. Does jQuery work with both HTML and XML?

Selecting and working with HTML or XML trees

Yes. jQuery can traverse HTML and XML once they’re parsed into a DOM.

var xml = "<books><book id='b1'>JS</book></books>";

var $xml = $($.parseXML(xml));

console.log($xml.find("book").text()); // "JS"

Same selectors and methods (.find(), .text(), .attr()) work for both.

3. What are jQuery selectors, and how do they relate to CSS selectors?

Use CSS-style selectors plus some jQuery extras

Examples:

$("#main") // by id

$(".item") // by class

$("input[name='email']") // attribute

$("div:visible") // jQuery-specific

They return a jQuery collection so you can act on the matches.

4. What are the main advantages of jQuery?

Why teams used it: speed, compatibility, fewer lines

Cross-browser DOM and event fixes
Short APIs for Ajax and effects
Chainable calls
Plugin ecosystem
Small minified file

These features made jQuery the default for UI work for years.

5. Which methods give you effects and animations?

Visual helpers in one-liners

.show(), .hide(), .toggle()
.fadeIn(), .fadeOut(), .fadeToggle()
.slideDown(), .slideUp(), .slideToggle()
.animate()

$("#box")

.fadeIn(400)

.animate({ left: "200px" }, 600);

6. What’s the difference between .empty(), .remove(), and .detach()?

Clearing content, deleting nodes, and keeping handlers

.empty() → clears children only.
.remove() → removes node + children + events/data.
.detach() → removes node but keeps events/data so you can reinsert it.

7. Is jQuery a JavaScript or JSON library?

It’s JavaScript, not JSON

jQuery is written in JavaScript and ships as a .js file. It can fetch/parse JSON, but it isn’t a JSON library itself.

8. What Ajax helpers does jQuery have?

From $.ajax to shorthand methods

$.ajax() → full control
$.get() → quick GET
$.post() → quick POST
$.getJSON() → fetch JSON
$.getScript() → load JS
$.ajaxSetup() → global defaults
$.when() → sync multiple calls

9. Which operating systems run jQuery?

Any OS with a browser that runs JS

jQuery works in Chrome, Firefox, Safari, Edge, Android browsers, and iOS browsers. The browser matters more than the OS.

10. How do you include jQuery in ASP.NET?

CDN, local file, or NuGet

CDN:

Local script file
NuGet in Visual Studio

Put the <script> before code that depends on it.

11. What does $.param() do?

Turn objects into query strings

var data = { q: "search", page: 2 };

console.log($.param(data)); // "q=search&page=2"

12. How do you check the jQuery version?

console.log($.fn.jquery);

Run in the console to see the version.

13. What is “jQuery Connect”?

Not an official API

It usually means event binding or using Ajax with jQuery. Example:

$("#btn").on("click", function(){

$.ajax("/api/ping").done(console.log);

});

14. Difference between .find() and .children()?

Descendants vs immediate children

.find() searches all descendants. .children() only returns direct children.

15. How does jQuery handle errors, especially in Ajax?

Callbacks and global hooks

$.ajax("/api")

.done(data => console.log(data))

.fail((xhr, status, err) => console.error(err));

Global:

$(document).ajaxError(fn);

16. What storage options can you use with jQuery?

.data() on elements
localStorage / sessionStorage
document.cookie

17. How do you make attribute selectors case-insensitive?

Use the i flag

$("[name='MyInput' i]").css("background","yellow");

18. Difference between $(this) and $(event.target)?

$(this) → element the handler is bound to
$(event.target) → element actually clicked

19. What is chaining, and why use it?

Chainable calls avoid repeat lookups

$("#box").css("color","red").slideUp(400).fadeOut(200);

20. How do $.when() and .then() work?

Coordinate async tasks

$.when($.ajax("/a"), $.ajax("/b"))

.then((a, b) => console.log("done", a[0], b[0]));

21. What does $.extend() do?

Merge objects

var opts = $.extend(true, {}, defaults, userOpts);

Shallow by default, deep if the first arg is true.

22. How is jQuery different from frameworks?

It’s a utility library, not an app framework

No routing, state, or build step
Drop it into any page
Good for incremental UI tweaks

23. What jQuery features matter for interviews?

Core areas

Selectors/traversal
DOM manipulation
Events/delegation
Effects
Ajax + Promises
Plugins/utilities

24. Is jQuery a JavaScript or JSON library?

JavaScript, not JSON.

25. Does jQuery work with XML?

Yes, parse XML to DOM and use .find() etc.

26. What is jQuery Mobile?

Touch-focused UI library

Provided mobile widgets and theming. Outdated now but still comes up in interviews.

27. What does $(document).ready() do?

Run when DOM is parsed

Shorthand:

$(function(){ /* code */ });

28. Difference between window.onload and document.ready()?

onload → after all assets load
ready → when DOM is parsed

29. Which methods create effects?

.toggle()
.slideDown()
.fadeOut()
.animate()

30. How to loop through all <p> elements?

$("p").each(function(i){

console.log(i, $(this).text());

});

31. What is the click event, and how do you bind it?

$("button").on("click", function(){

alert("clicked");

});

32. What does .delay() do?

Pause animations in the queue

$("#box").slideUp().delay(500).fadeIn();

33. What is ajaxStart()?

Global hook when the first Ajax call begins

$(document).ajaxStart(()=>$("#spinner").show());

34. What is ajaxComplete()?

Runs after each Ajax call, success or fail

35. Benefits of jQuery Ajax methods?

Partial page updates
Simple APIs
Cross-browser fixes
Shorthand helpers

36. Difference between .each() and $.each()?

$("el").each() → jQuery collections
$.each(array, fn) → plain arrays/objects

37. What is DataTables?

Plugin for advanced tables

Adds paging, sorting, and filtering.

38. What does .serialize() do?

Turn form values into a query string

$("#form").serialize();

39. How do you work with classes?

.addClass()
.removeClass()
.toggleClass()
.hasClass()

40. What categories of methods should you know?

DOM manipulation
CSS/attributes
Events
Effects
Ajax
Traversal
Utilities

41. What does jQuery.noConflict() do?

Releases $ for other libraries

var jq = $.noConflict();

jq("#el").hide();

42. Difference between .bind(), .live(), .delegate(), and .on()?

.bind() → direct only, deprecated
.live() → delegated at document, removed
.delegate() → better delegation, deprecated
.on() → modern method for both direct and delegated

How to Turn These Basics Into Interview Wins

Knowing the answers is one thing. Delivering them smoothly in an interview, with a timer running and a hiring manager staring at you, is a different game. I learned that the hard way.

That’s why I built InterviewCoder. It runs silently during your interview, giving you real-time code suggestions, debugging help, and clear explanations while you focus on communicating. It’s the edge I used to land internships at Amazon, Meta, and TikTok without blanking under pressure.

Want the same backup? Download InterviewCoder free today and bring a quiet co-pilot to your next interview.

Top 28 jQuery Interview Questions for Experienced Candidates

1. Would you still favor jQuery when the same tasks can be done with plain JavaScript?

When to pick jQuery vs plain JS

Answer: For most new projects, use plain JavaScript. The platform gives you querySelectorAll, classList, fetch, addEventListener, and Promises. That covers the common cases without adding a library.

Keep jQuery when you’re in a legacy codebase, rely on existing plugins, or need to move fast inside a stack that already ships it.

// jQuery

$('#btn').on('click', () => { $('#msg').text('Hello'); });

// Vanilla

document.getElementById('btn').addEventListener('click', () => {

document.getElementById('msg').textContent = 'Hello';

});

2. Can you pause or postpone the execution of document.ready?

Holding DOM-ready until setup finishes

Answer: Yes. Use jQuery.holdReady(true) to pause and jQuery.holdReady(false) to release after your async prep.

jQuery.holdReady(true);

loadConfig().then(() => jQuery.holdReady(false));

</script>

3. What is event.stopPropagation(), and when do you use it?

Stop a child click from bubbling to parents

Answer: It stops the event from traveling up the DOM. Use it when a child handler should run without firing parent handlers.

<button id="child">Click me</button>

</div>

$('#parent').on('click', () => console.log('parent clicked'));

$('#child').on('click', function(e) {

e.stopPropagation();

console.log('child clicked only');

});

</script>

4. What are the benefits of jQuery in an ASP.NET app?

Why does it still help on WebForms and older pages

Answer: Short helper calls, cross-browser fixes, wide plugin support, and less client code to write. It also plays well with server controls once you point at the right client IDs.

5. What does event.preventDefault() do?

Cancel the browser’s default action

Answer: It stops the default step (like form submit or link nav) so your code can handle it.

</form>

$('#myForm').on('submit', function(e) {

e.preventDefault();

const data = $(this).serialize();

$.post('/api/save', data).done(() => $('#status').text('Saved'));

});

</script>

6. How can you extract query text with regex and with modern APIs?

Regex vs URLSearchParams

Answer (regex):

const qs = window.location.search; // ?q=term&x=1

const m = /[?&]q=([^&]*)/.exec(qs);

const q = m ? decodeURIComponent(m[1]) : null;

Answer (modern and simpler):

const q = new URLSearchParams(window.location.search).get('q');

7. In jQuery, what’s the difference between $(this) and this?

jQuery wrapper vs raw DOM

Answer: this inside a jQuery callback is the DOM node. $(this) wraps it so you can call jQuery methods.

$('li').each(function() {

console.log(this.tagName); // DOM

$(this).addClass('selected'); // jQuery

});

8. Why use a CDN for jQuery?

Faster loads and shared cache

Answer: Better caching across sites, lower latency, and less load on your servers.

Consider a local fallback if the CDN is unreachable.

9. jquery.min.js vs jquery.js

Minified vs readable

Answer: jquery.js is readable for dev; jquery.min.js is smaller for production.

10. What is the jQuery connect() method?

Not in core

Answer: There’s no core connect(). If you see it, it’s from a plugin or a UI widget. Check the docs for that specific lib.

// New jQuery object from DOM nodes

const $items = $('li');

const $clone = $($items.get());

11. Show a clean chaining example

One selection, many steps

$(function(){

$('#id').addClass('ib')

.css('color', 'blue')

.fadeIn('slow');

});

12. With 5 <div>s fading out in a stagger, what’s the time between Start and End?

Reading .promise() timing

Answer: If durations are 0, 2000, 4000, 6000, 8000 ms, the last one ends around 8s. .promise().done(...) fires after that last fade ends.

13. Selector for elements whose ID ends with "IB"

Attribute “ends with”

$("[id$='IB']")

14. How do you disable elements with jQuery?

Use prop for booleans

$('.myInput').prop('disabled', true); // disable

$('.myInput').prop('disabled', false); // enable

15. Prevent default submit and run custom logic

Intercept submit and do AJAX

<button type="submit">Submit</button>

</form>

$('#loginForm').on('submit', function(e) {

e.preventDefault();

const data = $(this).serialize();

$.post('/login', data).done(() => $('#status').text('ok'));

});

</script>

16. What does this chain do?

$("div").css("width","500px").add("p").css("background-color","yellow")

Answer: Sets the width on all <div>, then adds all <p> to the same set, then sets the background on both sets.

17. Animate #expand from 50×50 to 300×300 over 5s

Resize with .animate()

$("#expand").animate({ width: "300px", height: "300px" }, 5000);

18. Create and delete cookies with jQuery?

Use plain JS or a tiny cookie lib

jQuery core has no cookie API.

function setCookie(name, value, days) {

const d = new Date();

d.setTime(d.getTime() + days*24*60*60*1000);

document.cookie = `${name}=${encodeURIComponent(value)};expires=${d.toUTCString()};path=/`;

}

function getCookie(name) {

return document.cookie.split('; ').reduce((r, c) => {

const [k, v] = c.split('=');

return k === name ? decodeURIComponent(v) : r;

}, '');

}

function deleteCookie(name) { setCookie(name, '', -1); }

Or use js-cookie:

Cookies.set('cookieName', 'cookieValue');

Cookies.get('cookieName');

Cookies.remove('cookieName');

19. How to perform jQuery AJAX requests?

$.ajax and shorthands

$.ajax({

url: '/api/data',

method: 'GET',

dataType: 'json',

success(result) { $('#out').text(JSON.stringify(result)); },

error(xhr) { console.error('Request failed', xhr.status); }

});

For simple calls, use $.get, $.post, or $.getJSON.

20. Why is jQuery still relevant with React/Vue around?

Where it still fits

Answer: Small features on multi-page sites, form tweaks, quick UI fixes, legacy pages, and stacks that already include it. For big apps, pick a framework.

21. Explain event delegation with .on() and mention old APIs

One handler on a parent; matches children by selector

$('#list').on('click', '.item', function(e) {

console.log('item clicked', this);

});

.bind()/.live() are old and removed or deprecated. Use .on() and remove with .off().

22. .attr() vs .prop()

Static markup vs live state

// checkbox

$('#cb').attr('checked'); // original attribute

$('#cb').prop('checked'); // current boolean state

Use prop for checked/disabled/selected.

23. How do you remove handlers?

Use .off()

$('#btn').on('click.myNs', handler);

$('#btn').off('click.myNs'); // remove by namespace

$('#btn').off(); // remove all from #btn

Namespaces help target the right handler.

24. Ways to keep jQuery fast

Practical tips

Cache selectors: const $list = $('#list')
Batch DOM changes; reinsert once
Use delegation instead of many handlers
Prefer ID/class selectors
Only ship jQuery when the page needs it

25. What does jQuery.noConflict() do?

Give $ back to another library

const jq = jQuery.noConflict();

jq('#id').text('Using jq alias');

</script>

26. .data() vs data-* attributes

Runtime state vs HTML defaults

// HTML: <div id="x" data-role="admin"></div>

const role = $('#x').data('role'); // 'admin'

$('#x').data('role', 'editor'); // updates cache, not attribute

Use data-* for server-rendered defaults; use .data() during runtime.

27. How do you write a simple jQuery plugin?

Minimal plugin pattern

(function($){

$.fn.greenify = function(options) {

const settings = $.extend({ color: 'green' }, options);

return this.each(function() {

$(this).css('color', settings.color);

});

};

})(jQuery);

// use

$('p').greenify({ color: 'teal' });

Return this to keep chaining.

28. Selector performance tips and traps

Target less, get more done

Start with an ID when you can: $('#parent .child')
Limit scope with a context: $('#wrap').find('.item')
Cache results you reuse
Skip global matches like "*" and heavy pseudo-selectors in hot paths
In tight loops, prefer native DOM where it’s simpler

When the Interview Gets Real

Senior screens are less about syntax and more about clear thinking under pressure. I’ve been there, whiteboard marker in hand, brain lagging.

That’s why I built InterviewCoder. It runs quietly during your interview and gives you live code ideas, debugging tips, and short explanations while you speak to the problem. I used this setup to land internships at Amazon, Meta, and TikTok.

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28 Essential jQuery Interview Questions

1. What does this selector do?

2. Why doesn’t this click handler work on new buttons?

3. How do I select elements with IDs ending in a string?

Q4. What’s the $ in jQuery, and how do you avoid conflicts?

5. Animate a div from 100×100 to 200×200 over 3s

6. What is method chaining?

7. Explain this code

8. Which is faster?

9. Difference between event.preventDefault() and event.stopPropagation()

10. What happens if you return false?

11. How does .clone() work?

12. What does .promise() do?

13. How to remove an element before its Promise resolves?

14. .detach() vs .remove()

15. document.ready() vs window.onload

16. prop() vs attr()

17. Another view on prop() vs attr()

18. How to use jQuery in ASP.NET?

19. Hide a div on button click

20. What is jQuery UI Datepicker?

21. Scroll a multiline ASP.NET textbox

22. Define .animate()

23. Difference between .bind() and .live()

24. What is jQuery UI Sortable?

25. What are fade effects?

26. What is .queue()?

27. How are jQuery selectors executed?

28. How can you use arrays with jQuery?

How to Stay Calm When the Real Interview Starts

Related Reading

Top 42 Basic jQuery Interview Questions for Freshers

1. What is jQuery, and why do interviewers still ask about it?

2. Does jQuery work with both HTML and XML?

3. What are jQuery selectors, and how do they relate to CSS selectors?

4. What are the main advantages of jQuery?

5. Which methods give you effects and animations?

6. What’s the difference between .empty(), .remove(), and .detach()?

7. Is jQuery a JavaScript or JSON library?

8. What Ajax helpers does jQuery have?

9. Which operating systems run jQuery?

10. How do you include jQuery in ASP.NET?

11. What does $.param() do?

12. How do you check the jQuery version?

13. What is “jQuery Connect”?

14. Difference between .find() and .children()?

15. How does jQuery handle errors, especially in Ajax?

16. What storage options can you use with jQuery?

17. How do you make attribute selectors case-insensitive?

18. Difference between $(this) and $(event.target)?

19. What is chaining, and why use it?

20. How do $.when() and .then() work?

21. What does $.extend() do?

22. How is jQuery different from frameworks?

23. What jQuery features matter for interviews?

24. Is jQuery a JavaScript or JSON library?

25. Does jQuery work with XML?

26. What is jQuery Mobile?

27. What does $(document).ready() do?

28. Difference between window.onload and document.ready()?

29. Which methods create effects?

30. How to loop through all <p> elements?

31. What is the click event, and how do you bind it?

32. What does .delay() do?

33. What is ajaxStart()?

34. What is ajaxComplete()?

35. Benefits of jQuery Ajax methods?

36. Difference between .each() and $.each()?

37. What is DataTables?

38. What does .serialize() do?

39. How do you work with classes?

40. What categories of methods should you know?

41. What does jQuery.noConflict() do?

42. Difference between .bind(), .live(), .delegate(), and .on()?

How to Turn These Basics Into Interview Wins

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Top 28 jQuery Interview Questions for Experienced Candidates

1. Would you still favor jQuery when the same tasks can be done with plain JavaScript?

2. Can you pause or postpone the execution of document.ready?

3. What is event.stopPropagation(), and when do you use it?