100 Must-Know jQuery Interview Questions and Answers 2024

jQuery Fundamentals

1.
What is jQuery and what is it primarily used for?
Answer:
2.
How can you include jQuery in a web page?
Answer:
3.
What is the difference between jQuery and JavaScript?
Answer:
4.
How do you check if the DOM is fully loaded using jQuery?
Answer:
5.
Explain the $ symbol in jQuery.
Answer:
6.
What is the significance of the document.ready() function?
Answer:
7.
How would you select an element with a specific ID using jQuery?
Answer:
8.
What is chaining in jQuery and how does it work?
Answer:
9.
Explain the concept of selectors in jQuery. Provide examples.
Answer:
10.
How do you select elements by class name in jQuery?
Answer:
11.
How would you select all p elements inside a div?
Answer:
12.
How can you select multiple elements with different IDs at once?
Answer:
13.
Describe how to get and set attribute values using jQuery.
Answer:
14.
How can you add, remove, or toggle class names on an element in jQuery?
Answer:
15.
What are jQuery filters and how do you use them?
Answer:
16.
How do you hide and show elements with jQuery?
Answer:
17.
Can you explain the difference between hide() and css('display', 'none')?
Answer:
18.
Discuss how to animate elements using jQuery.
Answer:
19.
What is the difference between $(this) and this in jQuery?
Answer:
20.
How do you manipulate the DOM using jQuery?
Answer:

jQuery Events

21.
How do you attach an event handler to elements in jQuery?
Answer:
22.
What is event bubbling and event capturing in jQuery?
Answer:
23.
Describe the on() method and how it differs from older methods like click().
Answer:
24.
How do you prevent the default action of an event in jQuery?
Answer:
25.
How would you bind a click event to all paragraphs?
Answer:
26.
What is event delegation and how do you use it in jQuery?
Answer:
27.
Explain how you can unbind an event handler from an element.
Answer:
28.
Can you describe the trigger() method?
Answer:
29.
How do you handle form submission using jQuery?
Answer:
30.
What is the difference between bind(), live(), and delegate()?
Answer:

jQuery Effects and Animations

31.
What are the basic effects provided by jQuery to manipulate elements?
Answer:
32.
How do you create a custom animation in jQuery?
Answer:
33.
Can you use jQuery to create a slide-up and slide-down effect?
Answer:
34.
Can you dynamically adjust the speed of an animation?
Answer:
35.
Describe the queue management for animations in jQuery.
Answer:

jQuery AJAX

36.
What is AJAX and how do you use it in jQuery?
Answer:
37.
How do you perform a GET request with jQuery AJAX?
Answer:
38.
Explain how to perform a POST request with jQuery AJAX.
Answer:
39.
How do you handle AJAX request errors in jQuery?
Answer:
40.
What is JSONP, and when would you use it with AJAX in jQuery?
Answer:
41.
Describe the $.ajaxSetup() method.
Answer:
42.
What is the difference between $.ajax(), $.get(), and $.post()?
Answer:
43.
How do you make an AJAX call synchronous in jQuery?
Answer:
44.
How would you load JSON data using jQuery AJAX?
Answer:
45.
What is a promise in jQuery and how does it relate to AJAX?
Answer:

jQuery UI Interaction

46.
What is jQuery UI and what features does it provide?
Answer:
47.
How do you add draggable behavior to an element in jQuery UI?
Answer:
48.
Explain how to resize elements with jQuery UI.
Answer:
49.
How do you create a tabbed interface with jQuery UI?
Answer:
50.
Describe the steps to add a datepicker widget to a text field with jQuery UI.
Answer:

jQuery Content Manipulation

51.
How do you get and set the contents of a div using jQuery?
Answer:
52.
What is the difference between .html() and .text()?
Answer:
53.
How do you replace the content of a container in jQuery?
Answer:
54.
What methods are used to insert content inside, before, or after selected elements?
Answer:
55.
Explain how to remove elements from the DOM using jQuery.
Answer:

jQuery Advanced Selectors

56.
How do you select an element based on its index?
Answer:
57.
Describe the differences between :eq(), :first, and :last selector.
Answer:
58.
Can you select all odd- or even-numbered items in a list using jQuery?
Answer:
59.
How do you filter elements that contain certain text using selectors?
Answer:
60.
What is the purpose of the .closest() method?
Answer:

jQuery Traversing the DOM

61.
Describe the methods you would use to traverse up the DOM tree.
Answer:
62.
How can you traverse down the DOM tree in jQuery?
Answer:
63.
What is the difference between .find() and .children() methods?
Answer:
64.
How do you filter the results of a selector?
Answer:
65.
Explain what .siblings() does in jQuery.
Answer:

jQuery Form Handling

66.
How do you disable a form element using jQuery?
Answer:
67.
What methods are used to gather form input values?
Answer:
68.
How can you check or uncheck a checkbox using jQuery?
Answer:
69.
Explain how to serialize a form into a query string with jQuery.
Answer:
70.
How do you dynamically add a form element in jQuery?
Answer:

jQuery Best Practices

71.
What are some best practices for using jQuery?
Answer:
72.
How can you avoid conflict with other JavaScript libraries in jQuery?
Answer:
73.
Describe how to organize jQuery code using modules or namespaces.
Answer:
74.
What are some performance considerations when writing jQuery code?
Answer:
75.
How do you ensure jQuery code is maintainable and scalable?
Answer:

jQuery Plugin Development

76.
How do you create a basic jQuery plugin?
Answer:
77.
Can you explain the “$.fn” namespace and its significance in plugin development?
Answer:
78.
How do you provide default options for a jQuery plugin?
Answer:
79.
What are the best practices for authoring a jQuery plugin?
Answer:
80.
How do you ensure your jQuery plugin is chainable?
Answer:

jQuery Troubleshooting and Debugging

81.
How do you debug jQuery code?
Answer:
82.
What common errors should you watch out for when working with jQuery?
Answer:
83.
Describe a situation where jQuery code may not execute as expected and how to resolve it.
Answer:
84.
How would you check if jQuery is loaded on a web page?
Answer:
85.
Explain how to monitor AJAX requests in a browser’s developer tools.
Answer:

jQuery Mobile

86.
What is jQuery Mobile?
Answer:
87.
How do you apply jQuery Mobile to an existing website?
Answer:
88.
What are the main features of jQuery Mobile?
Answer:
89.
How do you handle touch events with jQuery Mobile?
Answer:
90.
Describe how to create a responsive layout with jQuery Mobile.
Answer:

jQuery Optimization Techniques

91.
How can DOM manipulation be optimized in jQuery?
Answer:
92.
What strategies can you use to minimize the file size of jQuery scripts?
Answer:
93.
How would you delay the loading of jQuery code until it is needed?
Answer:
94.
What are the benefits of using a Content Delivery Network (CDN) with jQuery?
Answer:
95.
Explain how event delegation can improve performance.
Answer:

jQuery and ECMAScript

96.
How has the introduction of ECMAScript 6 (ES6) features affected jQuery development?
Answer:
97.
Can jQuery be used alongside modern JavaScript frameworks like React or Angular?
Answer:
98.
What is the impact of arrow functions in JavaScript on jQuery callback functions?
Answer:
99.
How do you use const and let in jQuery scripts?
Answer:
100.
What future developments in JavaScript do you think may impact the use of jQuery?
Answer:

Ace your next tech interview with confidence

Explore our carefully curated catalog of interview essentials covering full-stack, data structures and algorithms, system design, data science, and machine learning interview questions

100 jQuery interview questions

What is jQuery and what is it primarily used for?

How can you include jQuery in a web page?

What is the difference between jQuery and JavaScript?

How do you check if the DOM is fully loaded using jQuery?

Explain the $ symbol in jQuery.

What is the significance of the document.ready() function?

How would you select an element with a specific ID using jQuery?

What is chaining in jQuery and how does it work?

Explain the concept of selectors in jQuery. Provide examples.

How do you select elements by class name in jQuery?

How would you select all p elements inside a div?

How can you select multiple elements with different IDs at once?

Describe how to get and set attribute values using jQuery.

How can you add, remove, or toggle class names on an element in jQuery?

What are jQuery filters and how do you use them?

How do you hide and show elements with jQuery?

Can you explain the difference between hide() and css('display', 'none')?

Discuss how to animate elements using jQuery.

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

How do you manipulate the DOM using jQuery?

How do you attach an event handler to elements in jQuery?

What is event bubbling and event capturing in jQuery?

Describe the on() method and how it differs from older methods like click().

How do you prevent the default action of an event in jQuery?

How would you bind a click event to all paragraphs?

What is event delegation and how do you use it in jQuery?

Explain how you can unbind an event handler from an element.

Can you describe the trigger() method?

How do you handle form submission using jQuery?

What is the difference between bind(), live(), and delegate()?

What are the basic effects provided by jQuery to manipulate elements?

How do you create a custom animation in jQuery?

Can you use jQuery to create a slide-up and slide-down effect?

Can you dynamically adjust the speed of an animation?

Describe the queue management for animations in jQuery.

What is AJAX and how do you use it in jQuery?

How do you perform a GET request with jQuery AJAX?

Explain how to perform a POST request with jQuery AJAX.

How do you handle AJAX request errors in jQuery?

What is JSONP, and when would you use it with AJAX in jQuery?

Describe the $.ajaxSetup() method.

What is the difference between $.ajax(), $.get(), and $.post()?

How do you make an AJAX call synchronous in jQuery?

How would you load JSON data using jQuery AJAX?

What is a promise in jQuery and how does it relate to AJAX?

What is jQuery UI and what features does it provide?

How do you add draggable behavior to an element in jQuery UI?

Explain how to resize elements with jQuery UI.

How do you create a tabbed interface with jQuery UI?

Describe the steps to add a datepicker widget to a text field with jQuery UI.

How do you get and set the contents of a div using jQuery?

What is the difference between .html() and .text()?

How do you replace the content of a container in jQuery?

What methods are used to insert content inside, before, or after selected elements?

Explain how to remove elements from the DOM using jQuery.

How do you select an element based on its index?

Describe the differences between :eq(), :first, and :last selector.

Can you select all odd- or even-numbered items in a list using jQuery?

How do you filter elements that contain certain text using selectors?

What is the purpose of the .closest() method?

Describe the methods you would use to traverse up the DOM tree.

How can you traverse down the DOM tree in jQuery?

What is the difference between .find() and .children() methods?

How do you filter the results of a selector?

Explain what .siblings() does in jQuery.

How do you disable a form element using jQuery?

What methods are used to gather form input values?

How can you check or uncheck a checkbox using jQuery?

Explain how to serialize a form into a query string with jQuery.

How do you dynamically add a form element in jQuery?

What are some best practices for using jQuery?

How can you avoid conflict with other JavaScript libraries in jQuery?

Describe how to organize jQuery code using modules or namespaces.

What are some performance considerations when writing jQuery code?

How do you ensure jQuery code is maintainable and scalable?

How do you create a basic jQuery plugin?

Can you explain the “$.fn” namespace and its significance in plugin development?

Explain the `$` symbol in jQuery.

What is the significance of the `document.ready()` function?

How would you select all `p` elements inside a `div`?

Can you explain the difference between `hide()` and `css('display', 'none')`?

What is the difference between `$(this)` and `this` in jQuery?

Describe the `on()` method and how it differs from older methods like `click()`.

Can you describe the `trigger()` method?

What is the difference between `bind()`, `live()`, and `delegate()`?

Describe the `$.ajaxSetup()` method.

What is the difference between `$.ajax()`, `$.get()`, and `$.post()`?

How do you get and set the contents of a `div` using jQuery?

What is the difference between `.html()` and `.text()`?

Describe the differences between `:eq()`, `:first`, and `:last` selector.

What is the purpose of the `.closest()` method?

What is the difference between `.find()` and `.children()` methods?

Explain what `.siblings()` does in jQuery.

How do you use `const` and `let` in jQuery scripts?