jQuery Linkedin Assessment Test Question Answers

jQuery Linkedin Assessment Test Question Answers

What is jQuery and What is jQuery used for?

What is jQuery?

jQuery is a fast, small, and feature-rich JavaScript library. It was created to make it easier to use JavaScript on websites. With a combination of flexibility and extensibility, jQuery has changed the way that millions of people write JavaScript.

Some of the features that make jQuery popular include:

HTML document traversal and manipulation

Event handling

Animations

Ajax

jQuery is designed to simplify the process of writing JavaScript code and to make it easier to use JavaScript across multiple browsers. It is widely used in web development and is supported by a large and active community of developers.

An important tool for a front end developer is JavaScript, which helps to implement interactive features in your website such as audio and video, games, scrolling abilities, page animations. jQuery makes it much easier to use JavaScript on your website.

With jQuery, you can accomplish many common tasks that use a lot of JavaScript code with just one line of code.

The use of jQuery simplifies many of the complicated aspects of JavaScript, such as AJAX calls and DOM manipulation.

Linkedin jQuery Assessment Test Question Answers

1. What is the END STATE STYLE of the paragraph element in the code $('p').hide(); ?

visibility: hidden;

display: none;

height: 0;

opacity: 0;

2. What does this code do: $('#id1').animate({width:'250px'}, 'slow').animate({height:'250px'}, 'fast');

First the height animates, then the width animates.

First the width animates, then the height animates.

Both the width and height animates at the same time.

3. What is the equivalent of the following code? $('div').click(function {alert(1);});

$('div').handler('click',function {alert(1);});

$('div').bind('click',function {alert(1);});✔

$('div').call('click',function {alert(1);});

$('div').event('click',function {alert(1);});

4. $(function(){ //executable code }); The executable code will be run:

after everything has loaded

after everything except other scripts are loaded

after all other javascript has been read and executed

before anything has loaded

after the DOM has loaded, but prior to anything else loading

5. The selector :disabled will perform the following:

Select only elements in a disabled state

Create a new element with the state set to disabled

None of the above

Disable any elements currently set to an enabled state

6. What is a particular performance concern when dealing with event handlers, and how can you cope with it?

Finding which element an event occurred on is expensive. Assign most events to document.body and use .is() to act on the element of interest.

Some events, such as mousemove and scroll, happen a lot on a typical page. Debounce or throttle their handlers to make sure the handlers are not called more than you actually need.

Listening for an event that does not exist can create serious memory leaks. Be careful to spell event names correctly to avoid consuming too much memory.

DOM elements with an ID wil fire events more efficiently than with classes. Always use IDs instead of classes where possible.

7. What is the purpose of the jQuery.fx.off global property?

It turns off animations that are used to provide motion effect, but appearance effects remain enabled.

It causes animation effects that are triggered via functions to instead be executed using CSS.

It globally disables all animations. When animations are run, all animation will immediately set elements to their final state when called, rather than displaying an effect.

It globally disables animations that are triggered by CSS class changes.

8. When you use custom Jquery selection extensions, such as :animated, on a page with lots of DOM elements, you can run into performance issues. What is the best practice for managing those issues?

Select $(document.body) first, then use .filter with the custom extension.

Use the custom extension with .has().

Start with the custom extension, then use .find with a selector that exists in CSS to limit the selection.

Start with a selection that exists in CSS, then refine the selection using .filter() with the custom extension.

9. What is the main difference between the ajaxStop and ajaxComplete global handlers?

ajaxStop fires when all open requests have completed, while ajaxComplete fires when an individual request completes.

There is no difference. They are aliases of each other.

ajaxStop fires when an error has been encountered, while ajaxComplete fires when a successful request completes.

ajaxComplete fires when all open requests have completed, while ajaxStop fires when an individual request completes.

10. The :only-child selector selects _.

all elements that are child elements.

elements that have no siblings.

elements that have only one child element.

only the child elements of a given element.

11. Because querySelectorAll and querySelector are in the native DOM API of modern browsers, you don't need jQuery to do many kinds of DOM selections. But the jQuery selector engine does provide extensions that browsers do not support natively. Which extension is supported only by jQuery and not by querySelector or querySelectorAll?

:parent, which can select elements that have children

:visible, which can select elements that jQuery considers to be visible

:contains, which can select elements by the text they contain

:nth-of-type, which can select elements that are the nth element of their type within their parent

12. What is the difference between these two snippets?

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

alert('you clicked the button!');

});

$('button').click(function () {

alert('you clicked the button!');

});

Only the second one will work; jQuery does not have a function called .on.

The second snippet will not function.

Nothing .click(function) is shorter way to write .on('click', function).

The first snippet will execute for every button on the page, the second will only apply to the first button.

13. What does the following line of code do?

jQuery('p')

Loads a paragraph tag from a remote server using AJAX

Aliases jQuery to a variable p

Selects all paragraphs on the page

Creates a new paragraph tag and inserts it into the body tag

14. Given the following HTML, how could we use one line to hide or show the button?

<button class="btn btn-primary" type="submit">Continue to checkout</button>

$('.btn-primary').toggle();

$('.btn-primary').showHide();

$('.btn-primary').not(':visible').show();

$('.btn-primary').css({ display: 'block'});

15. Working with AJAX, we may run into situations where a piece of code should not be run until after multiple AJAX calls have completed successfully. Say we need to call two external services for JSON data (a list of students, and a list of classes). And only after retrieving those data will we perform some manipulations on a page. What is the preferred way for dealing with this scenario?

https://example.com/json-api/students

https://example.com/json-api/classes

$.get(

['https://example.com/json-api/students', 'https://example.com/json-api/classes'],

function (studentRequest, classRequest) {

// the rest of the code goes here

);

$.when(

$.get('https://example.com/json-api/students'),

$.get('https://example.com/json-api/classes'),

).done(function (studentRequest, classRequest) {

// the rest of the code goes here

});

$.bind(

$.get('https://example.com/json-api/students'),

$.get('https://example.com/json-api/classes'),

).done(function (studentRequest, classRequest) {

// the rest of the code goes here

});

$.ajax('https://example.com/json-api/students', {

success: function (studentRequest) {

$.ajax('https://example.com/json-api/classes', {

success: function (classRequest) {

// the rest of the code goes here

});

16. Given the snippet of HTML below, what is the difference between the two lines that follow it?

<ul>

</ul>

$('ul').find('li').get(2);

$('ul').find('li').eq(2);

.get() retrieves a DOM element, and can't be chained, eq() retrieves a jQuery object, and can be chained.

.get() retrieves a jQuery object, and can't be chained, eq() retrieves a DOM element, and can be chained.

.get() retrieves a jQuery object, and is zero-indexed, eq() retrieves a DOM element, and is 1-indexed.

.get() retrieves a DOM element, and is zero-indexed, eq() retrieves a jQuery object, and is 1-indexed.

17. What is the main difference between the contents() and children() functions?

They both return the content of selected nodes, but children() also includes text and comment nodes.

The contents() function only includes text nodes of the selected elements.

The children() function only includes text nodes of the selected elements.

They both return the content of selected nodes, but contents() also includes text and comment nodes.

18. If your JavaScript project involves a lot of DOM manipulation, but no AJAX or animation, which version of jQuery should you use?

jQuery 3 compressed

jQuery 3 slim

jQuery 2

None of these - jQuery requires AJAX

19. The .ready() function is one of the most basic parts of jQuery, but jQuery also provides a mechanism for executing code when both one or more Promises have resolved and the DOM is ready. Which code snippet accomplishes this?

$(function({

getData : $.get('http://httpbin.org/get'),

delayedData : $.get('http://httpbin.org/delay/3')

}) {

//DOM is ready, getData and delayedData are available

});

$($.get('http://httpbin.org/get'), $.get('http://httpbin.org/delay/3')).then(function (

getData,

delayedData,

) {

//DOM is ready, getData and delayedData are available

});

$.when($.get('http://httpbin.org/get'), $.get('http://httpbin.org/delay/3')).then(function (

getData,

delayedData,

) {

//DOM is ready, getData and delayedData are available

});

$.ready($.get('http://httpbin.org/get'), $.get('http://httpbin.org/delay/3')).then(function (

getData,

delayedData,

) {

//DOM is ready, getData and delayedData are available

});

20. You want to take an element and any event handlers that go with it out of the DOM to do some work—without the changes affecting the rest of the page—and then move it somewhere else in the DOM, like right after the opening tag. What should go on the first line of this code snippet?

// what goes here?

// ... do some other hidden work on $example

$example.prependTo(document.body);

var $example = $('#example').remove();

var $example = $('#example').clone();

var $example = $('#example').detach();

var $example = $('#example').addBack().empty();

21. Review the HTML below. You want to select the first item in the list and fade it out, then select the subsequent items up to (but not including) the active item, and fade them out halfway. How can you set up a single chain to do this?

</ul>

$('.items > li').first().fadeOut().nextUntil('.active').fadeTo('fast', 0.5);

$('.items').children(':first-child').fadeOut().filter('.active').fadeTo('fast', 0.5);

$('.items > li').first().fadeOut().nextAll('.active').fadeOut(50);

$('.items').find('li:first-child').fadeOut().next('.active').fadeTo('fast', 0.5);

22. Suppose we want to have a ball created from an HTML element (id=ball) move down and to the right from its original location when clicked, and move back into its original place when finished. Given a starting point of this, which of these snippets would accomplish that goal?

$('#ball').click(function () {

// Our code goes here

});

$(this).animate(

{ top: '+=100', left: '+=100' },

{

duration: 600,

complete: function () {

$(this).animate({ top: '-=100', left: '-=100' }, 600);

);

$(this).animate({ top: '-=100', left: '-=100' }, 600, function () {

$(this).animate({ top: '+=100', left: '+=100' }, 600);

});

$(this).animate(

{ top: '=100', left: '=100' },

{

duration: 600,

complete: function () {

$(this).animate({ top: 0, left: 0 }, 600);

);

$(this).animate({ top: '100', left: '100' }, 600, function () {

$(this).animate({ top: 0, left: 0 }, 600);

});

23. Given the following CSS and HTML codes below, how could you apply the success class to the feedback div?

.success {

color: green;

background: #ddffdd;

}

<div class="feedback">Thank you for answering this survey.</div>

$('.feedback').hasClass('.success');

$.css('.feedback', '.success');

$('.feedback').addClass('success');

$('.feedback').css('.success');

24. The following page snippet includes a couple of messages in a list, and a code snippet that retrieves a few hundred messages from an API endpoint using AJAX. How can you add these new items to the .message-area--list element in the most performant way?

<li>Existing message 1</li>

<li>Existing message 2</li>

</ul>

</div>

$.get('//example.com/api/v1/message').done(function (data) { var tonsOfItems = data.messages; // add

all these messages to a large page });

tonsOfItems.map(function (item) {

$('.message-area--list').append('<li>' + item + '</li>');

});

var tonsOfListItems = tonsOfItems.map(function (item) {

return '<li>' + item + '</li>';

});

$('.message-area--list').append(tonsOfListItems.join(''));

CSS.$messageList = $('.message-area--list');

$.each(tonsOfItems, function (idx, item) {

$('<li>' + item + '</li>').appendTo($messageList);

});

$.each(tonsOfItems, function (idx, item) {

$('.message-area--list').append('<li>' + item + '</li>');

});

25. What is jQuery?

jQuery is a bridge between Java and Javascript that makes native apps easier to write.

jQuery is a plugin for JavaScript that makes database queries easier to write.

jQuery is a collection of JavaScript functions that makes finding and manipulating elements on a page, AJAX, and other things easier.

jQuery is a Chrome extension that allows users to create their own extensions with just a few lines of JavaScript.

26. We want to create a new jQuery plugin called linkUpdater that can be chained onto other jQuery selector like a normal plugin. It should update all the links in the referenced collection so they open in new windows or tabs. Below is the first cut. What is one problem with this plugin?

'user strict';

($.linkUpdater = function () {

this.find('a').attr('target', '_blank');

})(jQuery);

this needs to be wrapped, like $(this), in order to be chained in a plugin.

jQuery plugins can't be safely authored in strict mode.

In order to be used by other code, plugins need to be added to the global namespace, not wrapped in a function expression.

Our plugin should extend jQuery.fn, not jQuery itself.

27. Given this checkbox, how can you determine whether a user has selected or cleared the checkbox?

by checking the value of $('#same-address').val()

by checking the value of $('#same-address').prop('checked')

by checking the value of $('#same-address').attr('checked')

by checking the value of $('#same-address').checked

28. In some projects, jQuery is not included as a file with an obvious version number (if it has been run through a minifier or other code bundler, for example). How can you detect programmatically what version of jQuery is active?

jQuery.version()

jQuery.jquery

jQuery.prototype.version

jQuery.fn.jquery

29. Given this snippet of HTML, how can you get the value of the text field using jQuery?

$('input[type=text]').val()

$('.form-control').val()

all of these answers

$('#firstName').val()

29. Which property of the jQuery event object references the DOM object that dispatched an event?

target

self

source

object

30. You want to write a plugin that creates a new traversal function—such as parent() and children()—and behaves like the ones jQuery includes out of the box. It needs to correctly modify the list of selections jQuery tracks internally, build up a list of additional items, and return the merged collection. What do you need to return on the last line of the function in order for this plugin to work correctly?

$.fn.myTraverse = function() {

// ... setup

var additionalItems = [ /* some additional items for jQuery */ ];

return // return what?

}

return this.append(additionalItems);

return additionalItems.appendTo(this);

return this.pushStack(additionalItems);

return this.add(additionalItems);

31. Given this snippet of HTML and jQuery code, what will the result look like?

<li>

Item 3

<ul>

</ul>

</li>

</ul>

$('.items').find('.active').nextAll().addClass('after-active');

<ul class="items">

<li class="active">Item 1</li>

<li class="after-active">Item 2</li>

<li class="after-active">

Item 3

<ul>

<li>Sub Item 1</li>

<li>Sub Item 2</li>

</ul>

</li>

</ul>

Item 3

</ul>

</li>

</ul>

Item 3

<ul>

</ul>

</li>

</ul>

Item 3

</ul>

</li>

</ul>

32. You have an element with a series of code (not CSS) animations applied to it that could be triggered by code you control, or other code elsewhere (such as plugins). How can you fire some code when all those animations have completed?

$('#element').on('animationend', function () {

console.log('Finally, everything is done!');

});

$('#element')

.on('promise')

.then(function () {

console.log('Finally, everything is done!');

});

$('#element')

.promise()

.catch(function () {

console.log('Finally, everything is done!');

});

$('#element')

.promise()

.then(function () {

console.log('Finally, everything is done!');

});

33. HTML5 data attributes allow you to create valid custom attributes to store arbitrary data within DOM elements. jQuery has an API to interface with custom data such as the series of quotes below. How can you mark the second quote as your favorite?

<blockquote data-favorite="false">A quote</blockquote>

<blockquote data-favorite="false">A favorite quote</blockquote>

<blockquote data-favorite="false">A quote</blockquote>

</div>

$('blockquote'):second().attr('favorite', true);

$('blockquote:nth-child(2)').data('favorite', true);

$('blockquote').second().data('favorite', true);

$('blockquote:nth-child(2)').attr('favorite', true);

34. jQuery can create event handlers that execute exactly once. How is this done?

$('button').click(function() { console.log('this will only happen once'); }, false);

$('button').on('click', function() { console.log('this will only happen once'); }).off('click');

$('button').once('click', function() { console.log('this will only happen once'); });

$('button').one('click', function() { console.log('this will only happen once'); });

35. You want to implement the behavior of an effect like slideDown() manually using animate(). What is one critical point you need to remember?

slideDown() requires animating the background color; doing so with animate() requires the jQuery Color plugin.

slideDown() includes toggling visibility automatically. animate() does not automatically set any properties.

slideDown() requires the element to have a height set in pixels. animate() does not.

Effects created with animate() must be run over at least 100 milliseconds, where slideDown() can run as quickly as 50ms.

36. Generally speaking, when used on a web page, how should jQuery be installed, and why?

Just before the closing body tag, because we want to avoid blocking other resources from loading, and we use the ready method to make sure our code fires after the DOM is ready

Using the highest version number possible because only jQuery 3 and up are compatible with Internet Explorer 7

In the head tag because we want jQuery available as soon as possible

From a CDN because we want to be able to use jQuery online or offline

38. Given the following HTML, how could we make this button disappear from the page using jQuery?

<button class="btn btn-primary" type="submit">Continue to checkout</button>

$('.btn-primary').hide();

$('.btn-primary:visible').not();

$('.btn-primary').visibility(false);

$('.btn-primary').show(false);

39. What is the difference between $('header').html() and $('header').text()?

$('header').html() returns the inner HTML of the header. $('header').text() returns only the text

$('header').html() returns only the HTML tags used, without the text. $('header').text() returns only the text

$('header').html() strips all HTML from the header. $('header').text() always returns an empty string.

$('header').html() returns all headers in an HTML document. $('header').text() the first line of a text file.

40. When writing jQuery plugins, we often provide default options that may be overridden by the end user. What jQuery function is most useful for this purpose?

$.extend

$.clone

$.fn.extend

$.merge

41. There are times when you might want to programmatically trigger an event, instead of simply reacting to user input directly. Given this markup, Which choice will NOT cause a click event to the select box when the button is clicked?

<div>Here's a button you can click: <button class="btn">Click Me</button></div>

<form>

<p>Further down the page, there's a select box.</p>

</select>

</form>

</article>

$('button').on('click.myApp', (function() { $('input[type=select]').trigger('click'); });

$('button').on('click', (function() { $('input[type=select]').click()); });

$('button').trigger(function() { $('input[type=select]').click(); });

$('button').click(function() { $('input[type=select]').click(); });

42. You have an absolutely positioned element inside a relatively positioned parent element, and you want to animate that element within its parent element. What jQuery function is most useful for finding the initial coordinates of the .animate-me?

<style>

.parent {

position: relative;

top: 3em;

width: 50%;

min-height: 50vh;

margin: 0 auto;

}

.animate-me {

position: absolute;

top: 40px;

right: 30px;

}

</style>

</div>

$('.animate-me').offset();

$('.animate-me').each();

$('.animate-me').position();

$('.animate-me').offsetParent();

43. You want to work with AJAX using a Promise-like interface instead of nested callback functions. What jQuery API should you use?

jQuery.sub

jQuery.ajaxTransport

jQuery.Deferred

jQuery.proxy

44. What is tricky about jQuery's nth- filters (:nth-child, :nth-of-type, etc.) relative to other filters?

Referring to lists of items, they are 1-indexed (like CSS), not 0-indexed (like JavaScript).

They don't return the jQuery object, and cannot be chained.

They can return the wrong items if the DOM was recently manipulated.

They are not part of CSS, so they don't get the performance benefits of passing through the document.querySelectorAll.

45. jQuery's AJAX functions return objects that implement the Promise API. As a result, you can chain promises and avoid nested callbacks. What does that look like?

$.get('http://httpbin.org/delay/2')

.then(function (response) {

// Data from first GET is here as 'response'

return $.get('http://httpbin.org/delay/2');

})

.then(function (response) {

// Data from second GET is here as 'response'

});

$.get('http://httpbin.org/delay/2')

.catch(function (response) {

// Data from first GET is here as 'response'

return $.get('http://httpbin.org/delay/2');

})

.done(function (response) {

// Data from second GET is here as 'response'

});

$.get('http://httpbin.org/delay/2', function (response1) {

// Data from first GET is here as 'response1'

$.get('http://httpbin.org/delay/2', function (response2) {

// Data from second GET is here as 'response2'

});

$.get('http://httpbin.org/delay/2')

.then(function (response) {

// Data from first GET is here as 'response'

return response;

})

.get('http://httpbin.org/delay/2', function (response) {

// Data from second GET is here as 'response'

});

46. You want to have a ball that is created from an HTML element (id=ball) move down and to the right of its original location when clicked, and move back to its original place when finished. What snippet, added to the code below, would do this?

$('#ball').click(function () {

// Our code goes here

});

$(this).animate(

{

top: '-=100',

left: '-=100',

600,

function () {

$(this).animate(

{

top: '+=100',

left: '+=100',

600,

);

$(this).animate(

{

top: '+=100',

left: '+=100',

{

duration: 600,

complete: function () {

$(this).animate(

{

top: '-=100',

left: '-=100',

600,

);

$(this).animate(

{

top: 100,

left: 100,

600,

function () {

$(this).animate(

{

top: 0,

left: 0,

600,

);

$(this).animate(

{

top: 100,

left: 100,

{

duration: 600,

complete: function () {

$(this).animate(

{

top: 0,

left: 0,

600,

);

49. Which choice is an example of statement chaining?

var $p = $('p'); console.log($p.length);

$('p').find('a').children('li');

$('p > a > li');

$('p'); $('a'); $('li');

50. How can you ensure that some code executes only when a class active appears on an element?

$('.element').attr('class', 'active')

$('.element').with('.active')

$('.element').hasClass('active')

$('.active').then()

51. jQuery has a main function for handling AJAX, and several shorthand function including load() that make calling that main function easier. Given this HTML snippet, how can you insert only the second snippet from the source.html file (div#one) into the #load-me div on-demand via AJAX?

<div id="load-me">This area will be replaced with AJAX loaded content.</div>

<h1>First Piece</h1>

<p>Lorem ipsum duis maximus quam condimentum dolor eleifend scelerisque.</p>

</div>

<h1>Second Piece</h1>

<p>Lorem ipsum proin facilisis augue in risus interdum ornare.</p>

</div>

$('#load-me').get('source.html#one');

$('#load-me').get('source.html #one');

$('#load-me').load('source.html #one');

$('#load-me').load('source.html', '#one');

Q52. Given this HTML list and subsequent two lines of jQuery, what is the difference in the behavior of .closest() and .parents()?

<li>

Item 1

</ul>

</li>

</ul>

$('.leaf').closest('.items');

$('.leaf').parents('.items');

.closest() returns .leaf and #main-menu; .parents() returns #main-menu and #sub-menu.

.closest() returns .leaf and #sub-menu; .parents() returns #main-menu and #sub-menu.

.closest() returns only #main-menu; .parents() returns #main-menu and #sub-menu.

.closest() returns only #sub-menu; .parents() returns #main-menu and #sub-menu.

53. What does this line of code do?

$('ul > li:first-child');

selects the first list item inside all unordered lists on the page

selects the first list item inside the first unordered list on the page

selects the first element inside any list items on the page

creates a predefined CSS selector that can be reused later

54. Below is a list of items that you want to be clickable and an event handler function. How can you assign the event handler to every item in the list in a way that is most performant, and also that ensures that the handler is called even if more items are added to the list programmatically?

<li>First Item</li>

<li>Second Item</li>

<li>Third Item</li>

<li>Fourth Item</li>

<li>Fifth Item</li>

</ul>

function listResponder(evt) {

console.log('You clicked a list item that says', evt.target.innerText);

}

$('.clickable-list').click(listResponder);

$('.clickable-list').on('click', 'li', listResponder);

$('.clickable-list').on('click, append', listResponder);

$('.clickable-list').each(function() { $(this).click(listResponder); });

55. What is the difference between ('p').children('a')?

find() traverses only one level down, whereas children() selects anything inside the original element

$('p').find('a') finds all paragraphs inside links, whereas $('p').children('a') finds links within paragraph tags

.find() always searches the entire DOM tree, regardless of the original selection .children() searches only the immediate childern of an element

children() traverses only one level down, whereas find() selects anything inside the original element

56. Consider the following markup, used to lay out three balls on the page, all hidden. How can you select the green ball, make it faded in over the course of three seconds, and log a console message when the animation has finished?

</div>

$('.ball--green').fadeIn(3000, function(){

console.log("Animation is done!");

});

$('.ball--green').fade('in',3000).done(function(){

console.log("Animation is done!");

});

$('.ball--green').fadeIn(3).console().log("Animation is done!");

$('.ball--green').fadeIn("3s", function(){

console.log("Animation is done!");

});

57. Why might you use custom events instead of shared helper functions? For example

$(document).on('myCustomEvent', function(){

// act on my custom event

});

//and later...

$(document).trigger('myCustomEvent');

Custom events are at least an order of magnitude faster than helper functions

Custom events can be listened for and acted upon across one or more scripts without needing to keep helper functions in scope

Handler functions for custom events are less likely to be mangled by minification and obfuscation build tools

It is easier to write documentation for custom events than it is for helper functions

58. In the HTML and JavaScript below, the animations will all fire at once. How can you make them fire in sequence instead?

$('#element-1').animate({ top: '+=100' }); $('#element-2').animate({ top: '+=100' });

$('#element-3').animate({ top: '+=100' });

$('#element-1').animate({ top: '+=100' })

.pushStack('#element-2')

.animate({ top: '+=100' })

.pushStack('#element-3').animate({ top: '+=100' })

$('#element-1').animate({ top: '+=100' }, function() {

$('#element-2').animate({ top: '+=100' }, function() {

$('#element-3').animate({ top: '+=100' });

})

});

$('#element-1').animate({ top: '+=100' })

.add('#element-2').animate({ top: '+=100' })

.add('#element-3').animate({ top: '+=100' })

$('#element-1').animate({ top: '+=100' }, {queue: 'custom'});

$('#element-2').animate({ top: '+=100' }, {queue: 'custom'});

$('#element-3').animate({ top: '+=100' }, {queue: 'custom'});

$('custom').dequeue();

59. The way .wrap() works is sometimes misunderstood. Given the DOM and jQuery snippets below, what does the modified DOM snippet look like?

</div>

$('#container').wrap('<div class="wrapper"></div>').css('border', '2px solid red');

</div>

<div class="wrapper">

<div id="container" style="border: 2px solid red;">

<div class="item">Here's an item</div>

</div>

</div>

</div>

60. How can you select the following blockquote AND the list in a single call to jQuery() without chaining?

<blockquote data-favorite="false">A quote</blockquote>

<blockquote data-favorite="true">A favorite quote</blockquote>

<blockquote data-favorite="false">A quote</blockquote>

</div>

</ul>

$('.quotes + .menu-first')

$('.quotes .menu-first')

$('.quotes, .menu-first')

$('.quotes' + '.menu-first')

61. Effects like show, hide, fadIn, and fadeOut can be called with no arguments, but can also take arguments for how long they should last. Which is NOT a duration argument supported by these functions?

"fast"

"extreme"

2000

"slow"

62. Though jQuery offers visual effects, it is considered a best practice to use CSS to set up different states triggered by classes, where it makes sense. What's the easiest way to enable and disable a class bounce on an element with the ID dialog?

$('#dialog').classToggle('bounce')

$('#dialog.bounce').removeClass().addClass()

$('#dialog').addOrRemoveClass('bounce')

$('#dialog').toggleClass('bounce')

63. What is the main difference between selectors and filters?

Selectors are used to refine the content that filters have been applied to.

Selectors are used to find and select content in a page. Filters are used to refine the results of selectors.

Filters are used to remove content from the page. Selectors are used to add content to the page

There is no real difference. They are both used to build up lists of page content.

64. You want to create a custom right-click menu. How might you start the code?

$('#canvas').on('click.right', function(){ console.log('Handled a right-click') });

$('#canvas').on('contextual', function(){ console.log('Handled a right-click') });

$('#canvas').on('contextmenu', function(){ console.log('Handled a right-click') });

$('#canvas').on('rightclick', function(){ console.log('Handled a right-click') });

65. What is the correct way to check how many paragraphs exist on a page using jQuery?

$('p').count()

$('p').length

$('*').find('p')

$('p').length()

66. As with many areas of JavaScript, keeping track of the meaning of this is important and sometimes tricky. What does this mean at each of the two points in this custom plugin snippet?

$.fn.customPlugin = function () {

// Point 1

return this.each(function () {

// Point 2

});

};

$(document).customPlugin();

At Point 1, this means a jQuery object. At Point 2, it means a DOM element.

In this case, they mean the same thing: a jQuery object.

In this case, they mean the same thing: a DOM element.

At Point 1, this means a DOM element. At Point 2, it means a jQuery object.

67. How can you make the first list item bold and the next item oblique, in a single statement chain?

</ul>

$('.menu-first > li').eq(0).css('font-weight', 'bold').eq(1).css('font-style', 'oblique');

$('.menu-first > li').first().css('font-weight', 'bold').after().css('font-style', 'oblique');

$('.menu-first > li').first().css('font-weight', 'bold').second().css('font-style', 'oblique');

$('.menu-first > li').eq(0).css('font-weight', 'bold').next().css('font-style', 'oblique');

68. How do you change the current value of a text field with the class .form-item to "555-1212"?

$.val('.form-item', '555-1212');

$('.form-item').val('555-1212');

$('.form-item').data('value', '555-1212');

$('.form-item').set('value', '555-1212');

69. How would you fire a callback when any AJAX request on a page has completed?

$('body').ajaxComplete(function() { console.count('An AJAX request completed'); });

$(document).on('ajax-complete', function() { console.count('An AJAX request completed'); });

$('body').on('ajaxComplete', function() { console.count('An AJAX request completed'); });

$(document).ajaxComplete(function() { console.count('An AJAX request completed'); });

70. Given this set of checkboxes, how can you select the one with the value "blimp"?

$('input[value="blimp"]');

$('input[value!="blimp"]');

$('checkbox').val('blimp');

$('input:checkbox').attr('value', 'blimp');

71. Given this snippet of HTML and jQuery code, what does the jQuery do?

</ul>

<li><a href="#">Subpage 1</a></li>

<li><a href="#">Subpage 2</a></li>

</ul>

var m = $('.menu'),

sm = $('.submenu');

m.add(sm);

m.css('font-weight', 'bold');

It makes all the menu items bold.

It throws an exception on line 3.

It makes the first set of menu items, not the second, bold.

It makes the second set of menu items, not the first, bold.

72. You want to take a block of type and animate it to a larger size with jQuery. The following HTML and JavaScript behaves strangely. What is the issue?

Animate me!

</div>

$('#type').animate(

{

fontSize: '+=1em',

3000,

);

jQuery does not support ems and will make the type 1 pixel larger instead of 1 em larger.

jQuery cannot override CSS in a style attribute, so the font size will not change.

The font size was set with a shorthand property, so jQuery will not animate the font size at all.

The font size was set with a shorthand property, so jQuery will start the animation from 0 instead of from 1 em.

73. When using the clone() function to duplicate an element, what is one of the main concerns your code needs to watch out for?

The clone() function may ignore data attributes on the original elements.

The clone() function may result in elements with duplicate ID attributes.

The clone() function may remove CSS classes from the cloned elements.

The clone() function may not respect the attribute order of the original elements.

74. When incorporating a plugin into a project, what are the important steps for basic installation and usage?

The jQuery script tag must come first, followed by the plugin, followed by your custom scripts, all preferably at or near the bottom of the page.

Your custom scripts must appear first in the document <head>, followed by jQuery, followed by the plugin.

The jQuery script tag and the plugin script tag must appear in the document <head>, and your custom scripts can follow anywhere on the page.

The jQuery script tag must appear in the document <head>, but the plugin and your custom scripts can appear anywhere else in any order.

75. These two script tags show different ways of using jQuery's ready() . What is true about both approaches?

$(function() {

// The rest of my code goes here

});

</script>

jQuery(document).ready(function($) {

// The rest of my code goes here

});

</script>

The code inside them can manipulate the DOM safely, knowing the browser has loaded it fully.

The code inside them can manipulate images on the page safely, knowing they have fully downloaded to the browser.

The code inside them will be run exactly once per user session.

The code inside them is not aware of the DOM.

76. Which describes how jQuery makes working with the DOM faster?

jQuery optimizes the DOM in a background thread, making updates faster.

jQuery avoids using the DOM at all.

jQuery uses a virtual DOM that batches updates, making inserts and deletes faster.

jQuery code to perform DOM manipulation is shorter and easier to write, but does not make DOM operations faster.

77. There are some issues with this snippet of jQuery. First, it is manipulating CSS directly, rather than manipulating classes and leaving the CSS in stylesheets. What else in this code is best to avoid?

$('.item').css('background-color', 'red');

// some other code here

var firstSubItem = $('.item').find('.sub-item').get(0);

// some other code here too

$('.item').parents('.navigation').css('font-weight', 'bold');

The .css() accepts only an object, not two separate arguments. This will trigger an exception that should be caught.

The $('.item') selection is being made several times. This should be cached in a variable for (however slightly) better performance and easier maintainability.

The call to .parents() is in an inefficient place.

All the calls to $('.item') should be chained together as a single executable line for better performance.

78. Which CSS selectors can you NOT use in jQuery?

You cannot use multiple class selectors such as .class1.class2.

You cannot use pseudo-classes such as :not or :last-of-type.

You cannot use IDs and classes together, such as #element.class.

None. All CSS selectors are compatible in jQuery.

79. Starting with some DOM elements in the nested structure below, you assign listeners for the same event to a child element and one of the parents using the JavaScript that follows. You want to ensure that when .leaf is clicked, only its event handler will be fired, instead of the click bubbling up and also firing the parent's click handler. What do you need to add to its handler function?

<li>

Item 1

<ul>

</ul>

</li>

</ul>

$('.leaf').click(function (event) {

console.log('Sub Item 1 got a click');

});

$('#main-menu').click(function (event) {

console.log('Main menu got a click');

});

event.capture();

event.stopPropagation();

event.preventDefault();

event.stop();

80. Using event delegation, you can listen for events on a lot of different items without having to attach separate listeners to each one. But there are times when you may want to check the type of item receiving the event before doing anything, such as checking if an image was clicked versus a text field. Given the starter code below, which choice shows what jQuery provides to help with that process?

</div>

$('#sidebar').click(function (evt) {

var $target = $(evt.target);

// What goes here?

});

$($target.get(0) + ':image')

$('img').is($target)

$target.filter('img')

$target.is('img')

81. How would you change this code to make Vanilla selected by default?

<input type="radio" value="strawberry">Strawberry

<input type="radio" value="vanilla">Vanilla

<input type="radio" value="chocolate">Chocolate

<input type="radio" value="vanilla" checked>

82. Which of the following jQuery selector selects all elements available in a DOM?

$('*')

$('?')

$('#')

None of the above.

83. Which of the following jQuery gets the style property of an element?

getClass( name )

getStyle( name)

css( name )

None of the above.

84. Which of the following jQuery prevents the browser from executing the default action?

preventDefault( )

stopImmediatePropagation( )

stopPropagation( )

None of the above.

85. CDN stands for -

Content development network

Content delivery network / Content distribution network

Communication development network

None of the above

86. The jQuery used to find all previous sibling elements of the current element is -

nextAll()

prevAll()

siblings()

None of the above

87. Given this set of checkboxes, how can you select the ones that have the phrase "sun" as part of the value?

$('checkbox').val(/sun/);

$('input[value*="sun"]');

$('input[value|="sun"]');

$('input:checkbox').attr('value', '*sun*');

88. How can you get an AJAX request to go through without triggering any of jQuery's AJAX events?

Set the type option to "none".

Set the processData option to false.

Set a success callback that returns false.

Set the option "global" to false.

89. The jQuery used to return the direct parent element of the selected element is -

parents()

parent()

offsetParent()

None of the above

90. The jQuery used to load data using HTTP get is -

get(URL, data, callback, dataType)

post(URL, data, callback, dataType)

ajax()

ajaxSend()

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

Yes

Can't say

Not possible

92. The code $("p").css("background-color","yellow") is equivalent to _________

jQuery("p").css("background-color","yellow")

document("p").css("background-color","yellow")

jq("p").css("background-color","yellow")

None of the above

93. Which of the following jQuery is used to add/remove one or more classes from the selected elements?

toggleClass()

fadeToggle()

toggle()

slideToggle()

94. What does the syntax $("p") will select?

All paragraph elements

Only first paragraph element

Only last paragraph element

None of the above

95. What does the syntax $("p span") will select?

All span elements inside the paragraph element

Only first span element inside the paragraph element

Only last span element inside the paragraph element

None of the above

96. The selector $(":disabled") will select -

The elements with the text ":disabled"

The elements that do not include the text ":disabled"

The hidden elements

All disabled input elements

97. Which of the following selector in jQuery is used to select the elements with lesser index value than the value of its index parameter?

jQuery :lt() selector

jQuery :gt() selector

jQuery :lang() selector

jQuery :nth-child selector

98. Using ________ function, we can hold or release the execution of jQuery's ready event.

jQuery.holdready()

jQuery.ready()

jQuery.holdReady()

jQuery.hold()

99. Is jQuery a library for client scripting or server scripting?

Client scripting

Server scripting

Both above

None of these

100. Which of the following jQuery checks the current selection against an expression?

getIs(selector)

is(selector)

checkIs(selector)

None of the above

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101. What is the correct jQuery code for making all div elements 100 pixels high?

$("div").height(100)

$("div").height="100

$(div").yPos(100)

None

102. Is jQuery a library for client scripting or server scripting?

Server scripting

Client scripting

Both of these

None

103. jQuery is used to perform an asynchronous HTTP request?

jQuery.ajaxAsync()

jQuery.ajaxSetup()

jQuery.ajax()

None

104. What does the following selector: $("div.intro) select?

All div elements with class="intro"

All div elements with id="intro"

The first div element with class="intro"

The first div element with id="intro"

105. Which of the following is/are the sources of Content Distribution Network(CDN) for jQuery.

jQuery CDN

Microsoft CDN

Google CDN

All of the above

106. Which of the following in jQuery is used to make copies of the set of matched elements?

jQuery detach()

jQuery delegate()

jQuery clone()

jQuery serialize()

107. The jQuery which is used to remove the tabs, space and the line breaks from the beginning and end of the specified string is -

jQuery empty()

jQuery trim()

jQuery remove()

jQuery serialize()

108. Which of the following jQuery returns the direct children of the selected element?

jQuery ancestors()

jQuery next()

jQuery children()

None of the above

109. Which of the following jQuery returns all siblings of the selected element?

jQuery ancestors()

jQuery siblings()

jQuery parents()

None of the above

110. The jQuery selector used to select the elements containing the specified string is -

jQuery :contains selector

jQuery :lang() selector

jQuery :nth-child selector

None of the above

111. The jQuery selector used to select the elements with the specified language code is -

jQuery :

jQuery :lang()

jQuery :

None of the above

112. Which of the following jQuery is used to replace all selected elements with new HTML elements?

jQuery replaceWith()

jQuery replaceAll()

jQuery load()

jQuery delegate()

113. The jQuery used to trigger a specified event handler for the selected element is -

jQuery trigger()

jQuery toggle()

jQuery eq()

jQuery next()

114. Which of the following is used to remove the specified attribute from the selected element?

jQuery remove()

jQuery empty()

jQuery removeAttr()

jQuery error()

115. Which of the following jQuery is used to merge the content of two or more objects into the first object?

jQuery extend()

jQuery eq()

jQuery data()

jQuery param()

116. There are many ways to create elements that can be added to the page. Which answer is NOT one of those ways, assuming you have the following on the page?

$('#elements').append($('<p class="appended">As an HTML string</p>'));

var p = document.createElement('p');

var text = document.createTextNode('As a DOM element');

p.appendChild(text);

$('#elements').append(p);

$('#elements').append(<p class="appended">As a JSX object</p>);

$('#elements').append(

$('<p>', {

class: 'appended',

text: 'As an attribute object',

}),

);

117. The .addClass() and .removeClass() can accept functions as arguments. What does this function do?

$('#menu').addClass(function () {

return $('body').attr('class');

});

It adds the first class found on the body element to the #menu element.

It adds all classes found on the #menu element to the body tag.

It replaces any classes on the #menu element with all classes from the body tag.

It adds all classes found on the body element to the #menu element.

119. You're working on a site that uses an old version of jQuery, and you want to update to a newer version. What's the most efficient way to do so?

Install the newer version of jQuery, go through each script one by one, and fix what looks broken.

Read the change notes for the newer version of jQuery, fix all scripts, install the newer version, and fix anything that remains broken.

Install the newer version of jQuery as well as its Migrate plugin, fix all warnings, and uninstall the Migrate plugin.

Install the newer version of jQuery at the same time, and use jQuery.noConflict() on pages that need the older version.

120. Let's say you have a page with just one link on it. How can you change the anchor tag so it links to example.com?

$('a').attribute('href', 'http://www.example.com')

$('a').attr('href', 'http://www.example.com')

$('a').data('href', 'http://www.example.com')

$('a').href('http://www.example.com')

121. What does $() mean in jQuery?

It is an alias to the main core of jQuery itself—the same as writing jQuery().

It is a utility function that selects the first element from the document.

It is a shorter way to write document.getElementById().

It is a utility function that selects the last element from the document.

122. Along with DOM traversal and manipulation, jQuery offers several general-purpose helper functions that fill in some JavaScript gaps, especially before ES2015. Which is NOT a jQuery utility function?

jQuery.each, a general purpose iterator for looping over arrays or objects

jQuery.isNumeric, which can check whether its argument is, or looks like, a number

jQuery.extend, which can merge objects and make complete deep copies of objects

jQuery.isMobile, which can tell whether the user is using a mobile browser

123. You want to implement the behavior of an effect like slideDown() manually using animate(). What is one critical point you need to remember?

SlideDown() requires animating the background color; doing so with animate() requires the jQuery Color plugin.

SlideDown() includes toggling visibility automatically. animate() does not automatically set any properties.

SlideDown() requires the element to have a height set in pixels. animate() does not.

Effects created with animate() must be run over at least 100 milliseconds, where slideDown() can run as quickly as 50ms.

124. How is jQuery licensed?

Public

Private

Open source

Proprietary

125. Which line would you add to this code to add "Cosmos" to the list of currencies using JavaScript?

var currencies = ['Bitcoin', 'Ethereum'];

/* Missing line */

console.log(currencies);

currencies.push("Cosmos");

Array.append("Cosmos", currencies);

currencies.add("Cosmos");

currencies(2) = "Cosmos";

126. --------------- takes a selector as its argument and returns true if at least one of the selected elements also matches the specified selector.

is()

index()

each()

map()

127. Which jQuery is used to switch between adding/removing one or more classes from selected elements?

toggleClass()

switch()

altClass()

switchClass()

128. What are the used to provide effects?

Show()

Hide()

Toggle()

All of these

129. How would you change this code to make Vanilla selected by default?

<input type="radio" value="strawberry">Strawberry

<input type="radio" value="vanilla">Vanilla

<input type="radio" value="chocolate">Chocolate

130. Which of the following is a single global function defined in the jQuery library?

jQuery()

$()

Queryanalysis()

None of the mentioned

131. What does the following jQuery selector: $("div#intro .head) will select?

All elements with class="head" inside the first div element with id="intro"

The first element with id="head" inside any div element with class="intro"

All div elements with id="intro"

None

132. Which built-in returns the character at the specified index?

characterAt()

getCharAt()

charAt()

None of the above

133. Which of the following is used for parsing JSON text?

jQuery.each()

jQuery.parseJSON()

jQuery.noConflict()

None above

134. The jQuery used to return the direct parent element of the selected element is -

parents()

parent()

offsetParent()

None of the above

Mostly asked jQuery interview questions and answers

What is jQuery?

jQuery is a fast, lightweight, feature-rich client-side JavaScript library. It is cross-platform and supports different types of browsers. It boost to JavaScript. Before jQuery, JavaScript codes were lengthy and bigger, even for smaller functions. It makes a website more interactive and attractive.

What is the difference between JavaScript and jQuery?

JavaScript is a language while jQuery is a built-in library built for JavaScript. jQuery simplifies the use of JavaScript language.

Is jQuery replacement of JavaScript?

No, jQuery is not the replacement of JavaScript. jQuery is written on the top of JavaScript, and it is a different library. jQuery is a lightweight JavaScript library which is used to interact with JavaScript and HTML.

Why do we use jQuery?

It is very easy to learn and use. improves the performance of an application used to develop browser, compatible web applications. It is very fast and facilitates to write minimal lines of codes for UI related functions. It provides cross-browser support.

Is jQuery library used for server scripting or client scripting?

It is a library for client-side Scripting.

Is jQuery a W3C standard?

No, jQuery is not a W3C standard.

What is the starting point of code execution in jQuery?

$(document).ready() function is the starting point of jQuery code. It is executed when DOM is loaded.

Can you use any other name in place of $ (dollar sign) in jQuery?

Yes, instead of $ (dollar sign) we can use jQuery as a function name.

Can you use multiple document.ready() function on the same page?

Yes. Can use any number of document.ready() function on the same page.

What is the difference between find and childrens?

Find is used to find all levels down the DOM tree while children is used to find single level down the DOM tree.

What is a CDN?

CDN stands for Content Delivery Network or Content Distribution Network. It is a large distributed system of servers deployed in multiple data centers across the internet. It provides the files from servers at a higher bandwidth that leads to faster loading time.

What are the advantages of using CDN?

It reduces the load from the server.

It saves bandwidth. jQuery framework is loaded faster from CDN.

If a user regularly visits a site which is using jQuery framework from any of these CDN, it will be cached.

How can you use a jQuery library in your project?

You can use a jQuery library in the ASP.Net project from downloading the latest jQuery library from jQuery.com and include the references to the jQuery library file in your HTML/PHP/JSP/Aspx page.

What are the selectors in jQuery? How many types of selectors in jQuery?

Selectors find the HTML elements in jQuery. There are many types of selectors. Some basic selectors are:

[#ID: It is used to select a single element which matches with the given ID

Name: It is used to select all elements which match with the given element Name.

.Class: It is used to select all elements which match with the given Class.

Universal (*): It is used to select all elements available in a DOM.

Multiple Elements E, F, G: It is used to selects the combined results of all the specified selectors E, F or G.

Attribute Selector: It is used to select elements based on its attribute value.]

What is a use of jQuery filter?

: jQuery filter is used to filter the specific values from the object.

What are the different types of selectors in jQuery?

There are three types of selectors in jQuery:

CSS Selector

Custom Selector

XPath Selector

What is $() in jQuery library?

The $() function is an alias of jQuery() function.

What are the effects s used in jQuery?

show() - displays or shows the selected elements.

hide() - hides the matched or selected elements.

toggle() - shows or hides the matched elements. In other words, it toggles between the hide() and shows() s.

fadeIn() - shows the matched elements by fading it to opaque. In other words, it fades in the selected elements.

What is the use of toggle() in JQuery?

The jQuery toggle() is a particular type of which is used to toggle between the hide() and show() . It shows the hidden elements and hides the shown element.

What is the purpose of fadeToggle() in JQuery?

The jQuery fadeToggle() is used to toggle between the fadeIn() and fadeOut() s. If the elements are faded in, it makes them faded out, and if they are faded out, it makes them faded in.

What is the use of delay() in JQuery?

The jQuery delay() is used to delay the execution of functions in the queue.

Is it possible that jQuery HTML work for both HTML and XML document?

No, jQuery HTML only works for HTML document. It doesn't work for XML documents.

What is the use of html() in JQuery?

The jQuery html() is used to change the entire content of the selected elements. It replaces the selected element content with new contents.

What is the use of css() in JQuery?

The jQuery CSS() is used to get (return)or set style properties or values for selected elements. It facilitates you to get one or more style properties. The jQuery CSS() provides two ways:

Can you write a jQuery code to select all links inside the paragraph?

Yes. You can use <a> tag nested inside paragraph <p> tag to select all links.

What is the difference between prop and attr?

attr(): It gets the value of an attribute for the first element in the set of matched element.

prop(): it gets the value of a property for the first element in the set of matched elements. It is introduced in jQuery 1.6.

What are the two types of CDNs?

There are two types of CDN:

Microsoft: It loads jQuery from AJAX CDN.

Google: It loads jQuery from Google libraries API.

What is the use of the animate() in jQuery?

The animate function is used to apply the custom animation effect to elements.

How can you disable jQuery animation?

By using jQuery property "jQuery.fx.off" and setting it to true, you can disable jQuery animation.

Why do we need to use jQuery?

JQuery is a JavaScript library designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.

What is jQuery mobile?

jQuery is a fast, small, cross-platform and feature-rich JavaScript library. It is designed to simplify the client-side scripting of HTML. It is a small, light-weight and fast JavaScript library.

What will the jQuery code $( P Hide ()?

$(this). hide() – hides the current element.

How do you create hide and show in jQuery?

hide(speed,callback); $(selector). show(speed,callback); The optional speed parameter specifies the speed of the hiding/showing, and can take the following values: “slow”, “fast”, or milliseconds.

Which jQuery syntax hides all the paragraph elements?

jQuery hide() The hide() hides the selected elements.

How we hide the elements in jQuery give an example?

Syntax: $(selector).

Which jQuery syntax shows all the paragraph elements?

jQuery Selector Syntax For example $(‘p’) selects all paragraphs

in the document.

How do I hide a paragraph when clicking on a button?

On the click event on hide button we are hiding the paragraph using $(“p”). hide().

How do you hide an element in HTML?

Set the style display property to “none”.

How do you hide one element and show another?

To show and hide div on mouse click using jQuery, use the toggle() .

What is the use of jQuery toggle ()?

The toggle() method attaches two or more functions to toggle between for the click event for the selected elements

Which is the fastest selector in jQuery?

ID and Element selector

What is the correct jQuery code to set the background color of all P elements to blue?

$("p"). style("background-color","blue"); $("p").

Which jQuery function is used to prevent code from running before the document is finished loading?

jQuery ready() function

How do I stop a jQuery function from running?

$(selector). stop(stopAll,goToEnd);

What is event preventDefault () in jQuery?

preventDefault() stops the default action of an element from happening.

What is the difference between stopPropagation and preventDefault?

preventDefault() will not allow the user to leave the page and open the URL. The event. stopPropagation() stops the propagation of an event from occurring in the bubbling or capturing phase.

What is jQuery parsing?

The jQuery parseJSON() takes a JSON string and returns a JavaScript object.

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