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jQuery

100 jQuery interview questions

Only coding challenges
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jQuery Fundamentals


  • 1.

    What is jQuery and what is it primarily used for?

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  • 2.

    How can you include jQuery in a web page?

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  • 3.

    What is the difference between jQuery and JavaScript?

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  • 4.

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

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  • 5.

    Explain the $ symbol in jQuery.

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  • 6.

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

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  • 7.

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

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  • 8.

    What is chaining in jQuery and how does it work?

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  • 9.

    Explain the concept of selectors in jQuery. Provide examples.

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  • 10.

    How do you select elements by class name in jQuery?

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  • 11.

    How would you select all p elements inside a div?

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  • 12.

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

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  • 13.

    Describe how to get and set attribute values using jQuery.

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  • 14.

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

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  • 15.

    What are jQuery filters and how do you use them?

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  • 16.

    How do you hide and show elements with jQuery?

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  • 17.

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

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  • 18.

    Discuss how to animate elements using jQuery.

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  • 19.

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

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  • 20.

    How do you manipulate the DOM using jQuery?

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jQuery Events


  • 21.

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

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  • 22.

    What is event bubbling and event capturing in jQuery?

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  • 23.

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

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  • 24.

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

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  • 25.

    How would you bind a click event to all paragraphs?

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  • 26.

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

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  • 27.

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

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  • 28.

    Can you describe the trigger() method?

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  • 29.

    How do you handle form submission using jQuery?

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  • 30.

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

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jQuery Effects and Animations


  • 31.

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

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  • 32.

    How do you create a custom animation in jQuery?

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  • 33.

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

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  • 34.

    Can you dynamically adjust the speed of an animation?

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  • 35.

    Describe the queue management for animations in jQuery.

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jQuery AJAX


  • 36.

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

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  • 37.

    How do you perform a GET request with jQuery AJAX?

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  • 38.

    Explain how to perform a POST request with jQuery AJAX.

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  • 39.

    How do you handle AJAX request errors in jQuery?

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  • 40.

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

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  • 41.

    Describe the $.ajaxSetup() method.

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  • 42.

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

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  • 43.

    How do you make an AJAX call synchronous in jQuery?

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  • 44.

    How would you load JSON data using jQuery AJAX?

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  • 45.

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

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jQuery UI Interaction


  • 46.

    What is jQuery UI and what features does it provide?

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  • 47.

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

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  • 48.

    Explain how to resize elements with jQuery UI.

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  • 49.

    How do you create a tabbed interface with jQuery UI?

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  • 50.

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

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jQuery Content Manipulation


  • 51.

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

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  • 52.

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

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  • 53.

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

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  • 54.

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

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  • 55.

    Explain how to remove elements from the DOM using jQuery.

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jQuery Advanced Selectors


  • 56.

    How do you select an element based on its index?

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  • 57.

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

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  • 58.

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

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  • 59.

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

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  • 60.

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

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jQuery Traversing the DOM


  • 61.

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

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  • 62.

    How can you traverse down the DOM tree in jQuery?

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  • 63.

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

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  • 64.

    How do you filter the results of a selector?

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  • 65.

    Explain what .siblings() does in jQuery.

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jQuery Form Handling


  • 66.

    How do you disable a form element using jQuery?

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  • 67.

    What methods are used to gather form input values?

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  • 68.

    How can you check or uncheck a checkbox using jQuery?

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  • 69.

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

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  • 70.

    How do you dynamically add a form element in jQuery?

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jQuery Best Practices


  • 71.

    What are some best practices for using jQuery?

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  • 72.

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

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  • 73.

    Describe how to organize jQuery code using modules or namespaces.

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  • 74.

    What are some performance considerations when writing jQuery code?

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  • 75.

    How do you ensure jQuery code is maintainable and scalable?

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jQuery Plugin Development


  • 76.

    How do you create a basic jQuery plugin?

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  • 77.

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

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  • 78.

    How do you provide default options for a jQuery plugin?

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  • 79.

    What are the best practices for authoring a jQuery plugin?

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  • 80.

    How do you ensure your jQuery plugin is chainable?

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jQuery Troubleshooting and Debugging


  • 81.

    How do you debug jQuery code?

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  • 82.

    What common errors should you watch out for when working with jQuery?

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  • 83.

    Describe a situation where jQuery code may not execute as expected and how to resolve it.

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  • 84.

    How would you check if jQuery is loaded on a web page?

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  • 85.

    Explain how to monitor AJAX requests in a browser’s developer tools.

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jQuery Mobile


  • 86.

    What is jQuery Mobile?

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  • 87.

    How do you apply jQuery Mobile to an existing website?

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  • 88.

    What are the main features of jQuery Mobile?

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  • 89.

    How do you handle touch events with jQuery Mobile?

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  • 90.

    Describe how to create a responsive layout with jQuery Mobile.

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jQuery Optimization Techniques


  • 91.

    How can DOM manipulation be optimized in jQuery?

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  • 92.

    What strategies can you use to minimize the file size of jQuery scripts?

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  • 93.

    How would you delay the loading of jQuery code until it is needed?

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  • 94.

    What are the benefits of using a Content Delivery Network (CDN) with jQuery?

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  • 95.

    Explain how event delegation can improve performance.

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jQuery and ECMAScript


  • 96.

    How has the introduction of ECMAScript 6 (ES6) features affected jQuery development?

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  • 97.

    Can jQuery be used alongside modern JavaScript frameworks like React or Angular?

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  • 98.

    What is the impact of arrow functions in JavaScript on jQuery callback functions?

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  • 99.

    How do you use const and let in jQuery scripts?

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  • 100.

    What future developments in JavaScript do you think may impact the use of jQuery?

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