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Quizzes > Computers & Technology > Programming & Software

Take the Ultimate jQuery & JavaScript Trivia Quiz!

Ready to ace this jquery test? Jump in and prove your skills!

Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
paper art illustration for jQuery quiz challenge on selectors, events, functions trivia on golden yellow background

Hey there, front-end enthusiasts! Ready to level up your skills? Dive into our jquery exam, a free scored JavaScript trivia quiz designed to test your mastery of selectors, events and functions. This engaging jQuery quiz and javascript jquery test will challenge both beginners and seasoned coders, sharpening your understanding of the latest techniques. Whether you're prepping for a front-end developer test or just love coding puzzles, you'll get instant feedback and detailed explanations to boost your confidence. Sharpen your focus, and join the fun - take the first step with our interactive JavaScript Quiz now and show off your JavaScript prowess!

Which jQuery function is used to run code when the DOM is fully loaded?
document.loaded()
$(document).ready()
$.onLoad()
window.onload
jQuery's $(document).ready() method ensures that your code runs as soon as the DOM is ready, without waiting for images or other resources. This is faster than window.onload, which waits for all content to load. It's commonly used to wrap jQuery code safely. https://api.jquery.com/ready/
How do you select all elements with the class name "item" in jQuery?
$("#item")
$("item")
$(".item")
$("*.item")
In CSS and jQuery selectors, a dot (.) before a name selects by class. $(".item") returns all elements that have class="item". Using no prefix or # would select tags or IDs instead. https://api.jquery.com/class-selector/
Which jQuery method is used to hide matched elements?
.disable()
.hide()
.invisible()
.vanish()
The .hide() method sets display:none on the selected elements, hiding them from view. It also accepts duration and easing arguments for animation. Other names like .vanish() are not part of the jQuery API. https://api.jquery.com/hide/
What feature of jQuery allows you to call multiple methods on the same selection in one statement?
Chaining
Grouping
Sequencing
Bundling
jQuery chaining returns the original jQuery object after each method call, allowing you to call another method directly. This makes code more concise and readable. Most jQuery methods return the jQuery object for chaining. https://learn.jquery.com/using-jquery-core/chaining/
Which jQuery method gets or sets the HTML contents of selected elements?
.text()
.val()
.data()
.html()
.html() retrieves or sets the inner HTML of selected elements, preserving any HTML tags. By contrast, .text() only deals with text content and escapes HTML. https://api.jquery.com/html/
Which of the following methods attaches a click event handler to elements in jQuery?
.attachClick()
.tap()
.click()
.onClick()
The .click() method is a shorthand for .on('click', …) and attaches a click event handler to the selected elements. Other method names like .attachClick() are not part of the jQuery API. https://api.jquery.com/click/
What is the shorthand jQuery method for making a basic GET AJAX request?
$.request()
$.get()
$.fetch()
$.ajaxGet()
$.get() is a shorthand method for $.ajax() with the HTTP GET method. It simplifies making basic GET requests by handling common options. https://api.jquery.com/jquery.get/
Which symbol is commonly used as a shorthand alias for jQuery?
$
J
jQ
jq
The dollar sign ($) is the most common alias for the jQuery object, allowing for concise code. You can release $ with noConflict() if it conflicts with other libraries. https://api.jquery.com/jQuery.noConflict/
Which selector syntax selects all checkbox input elements in jQuery?
$("input.checkbox")
$("input[type='checkbox']")
$("checkbox")
$("[type=checkbox]")
The attribute selector input[type='checkbox'] targets only input elements with type="checkbox". Simply using [type=checkbox] might select non-input elements with that attribute. https://api.jquery.com/attribute-equals-selector/
Which method introduced in jQuery 1.7 is recommended for attaching event handlers?
.on()
.delegate()
.bind()
.live()
.on() unifies .bind(), .delegate(), and .live() into a single API, offering flexibility for direct and delegated events. It's the recommended method since jQuery 1.7. https://api.jquery.com/on/
What does the .closest() method in jQuery do?
Selects sibling elements matching the selector
Clones the selected element
Finds all descendants matching the selector
Finds the first ancestor matching the selector
.closest() traverses up the DOM tree from the current element to find the first ancestor that matches the selector, including the element itself. It stops at the document root if none is found. https://api.jquery.com/closest/
How do you store arbitrary data associated with matched elements in jQuery?
.attachData()
.data()
.store()
.attr()
.data() stores and retrieves data attached to DOM elements via jQuery's internal storage, separate from HTML attributes. It's safer and faster for arbitrary data. https://api.jquery.com/data/
Which jQuery method allows you to run a callback after multiple Deferred objects resolve?
$.when()
$.combine()
$.all()
$.resolveAll()
$.when() accepts multiple Deferred or Promise objects and returns a single Promise that resolves when all inputs resolve. It simplifies coordinating multiple async operations. https://api.jquery.com/jQuery.when/
Before .on(), which method was used to attach delegated event handlers?
.delegate()
.attach()
.live()
.bind()
.delegate() allows binding an event handler to a parent element for events on specified child selectors, enabling dynamic content handling. It was superseded by .on(). https://api.jquery.com/delegate/
In a $.ajax() call, which option specifies that the response should be treated as JSON?
dataType: 'json'
type: 'json'
responseType: 'json'
format: 'json'
The dataType option in $.ajax() tells jQuery how to parse the server response. Setting dataType:'json' ensures the response is parsed as JSON. https://api.jquery.com/jquery.ajax/
Which method iterates over arrays and objects in jQuery?
$.loop()
$.map()
.forEach()
$.each()
$.each() iterates over both arrays and objects, executing a callback for each element or key/value pair. It returns the original collection and allows breaking by returning false. https://api.jquery.com/jquery.each/
Which jQuery method removes all event handlers attached to the selected elements?
.off()
.clearEvents()
.unbindAll()
.removeEvents()
The .off() method removes event handlers that were attached with .on() or .bind(). Without arguments, it removes all handlers for all events on the matched elements. https://api.jquery.com/off/
What does the .serialize() method do in jQuery?
Serializes JavaScript objects to JSON
Creates a binary representation of form inputs
Converts form data into a URL-encoded string
Encodes form data in Base64
.serialize() encodes a set of form elements as a string for submission, following the standard URL-encoded notation. It excludes disabled elements. https://api.jquery.com/serialize/
How can you add a custom selector to jQuery's selector engine?
jQuery.addSelector('custom', fn)
$.selector.add('custom', fn)
jQuery.extendSelector('custom', fn)
jQuery.expr[':'].custom = function(elem){…}
jQuery.expr[':'] is the hook for Sizzle custom pseudos. Assigning a function to jQuery.expr[':'].custom defines a new :custom selector. https://sizzlejs.com/
What is the recommended pattern for creating a reusable jQuery plugin?
(function($){ $.fn.myPlugin = function(){…}; })(jQuery);
$.createPlugin('myPlugin', fn)
jQuery.plugin('myPlugin', fn)
window.myPlugin = function(){…}
Wrapping plugin code in an IIFE passing jQuery as $ prevents variable conflicts. Extending $.fn adds the plugin to jQuery's chainable methods. https://learn.jquery.com/plugins/basic-plugin-creation/
Which function would you use to wait for several AJAX calls to complete before continuing?
$.when()
$.ajaxComplete()
$.allDone()
$.deferAll()
$.when() accepts multiple Deferreds or Promises and returns a master Promise that resolves when all inputs resolve, making it ideal for coordinating parallel AJAX calls. https://api.jquery.com/jQuery.when/
Which method removes elements from the DOM while preserving their event handlers and data?
.remove()
.empty()
.delete()
.detach()
.detach() removes the selected elements but retains all jQuery data and events, allowing you to reinsert them later with their handlers intact. https://api.jquery.com/detach/
What does $.noConflict() do in jQuery?
Prevents jQuery from making AJAX calls
Releases the $ identifier from jQuery
Reloads the jQuery library
Disables all jQuery methods
$.noConflict() relinquishes control of the $ variable so it can be used by other libraries, requiring you to use jQuery() instead of $(). https://api.jquery.com/jQuery.noConflict/
Which selector engine does jQuery use under the hood?
jQSelect
DOMQuery
CSSParser
Sizzle
jQuery uses the Sizzle selector engine to provide fast, CSS3-compliant element selection. Sizzle handles complex selectors and optimizations. https://sizzlejs.com/
Which jQuery method removes matched elements and also clears associated jQuery data and events?
.purge()
.detach()
.clear()
.remove()
.remove() not only removes the elements from the DOM but also clears all jQuery data and event handlers, preventing memory leaks. .detach() preserves data and events. https://api.jquery.com/remove/
0
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Study Outcomes

  1. Master jQuery Selectors -

    Quickly identify and construct effective selector patterns to target HTML elements using IDs, classes, attributes, and hierarchical relationships.

  2. Apply Event Handling -

    Demonstrate how to bind, trigger, and remove events with jQuery methods such as .on(), .click(), and .off() to create interactive web features.

  3. Utilize Core jQuery Methods -

    Execute common functions like .hide(), .show(), .addClass(), and .animate() to manipulate the DOM and enhance user experiences.

  4. Chain jQuery Operations -

    Combine multiple jQuery calls into efficient chains to write concise, readable code that performs complex interactions in a single statement.

  5. Debug Common jQuery Pitfalls -

    Identify typical mistakes and troubleshoot issues in selectors, event binding, and function logic to improve code reliability.

  6. Assess Your jQuery Knowledge -

    Evaluate your strengths and weaknesses across jQuery concepts, empowering you to focus your learning and prepare for interviews or real-world projects.

Cheat Sheet

  1. Powerful Selector Syntax -

    Popular selectors will appear on your jquery exam, so review CSS-based selectors like $("#id"), $(".class"), and $("tag") for precise DOM targeting (MDN Web Docs). Remember the order "ID first (#), then class (.), then tag" and combine selectors (e.g., $("form input.required")) to narrow results effectively.

  2. Event Handling and Delegation -

    Event questions on a javascript jquery test often focus on .click() versus .on("click",…) and delegated events (jQuery official docs). Use $(parent).on("click", "child", handler) to bind events to future elements and recall "Delegate up to level up" as a mnemonic for bubbling-based delegation.

  3. Chaining and Method Return Values -

    Chaining is a staple of any jQuery quiz - remember the "write less, do more" mantra from the jQuery API. Since most methods return the jQuery object, you can chain calls like $("#nav").addClass("active").slideDown(200) to keep code concise and readable.

  4. AJAX Requests Simplified -

    AJAX functions like $.ajax(), $.get(), and $.post() are staples of the jQuery test and JavaScript trivia quiz (W3C recommendations). Use the "Type, URL, Data" mnemonic (e.g., $.get("/api/items", {id:1}, callback)) and handle success/error callbacks to build robust async calls.

  5. DOM Traversal Techniques -

    DOM traversal methods such as .find(), .parent(), .siblings(), and .closest() are frequently tested on the jquery exam (DOM Level 3 spec). For example, $("#menu").find("li").last() targets the last list item - use these methods instead of manual loops for cleaner code.

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