Q1. What is jQuery?
Ans: jQuery is fast, lightweight and feature-rich client side
JavaScript Library/Framework which helps in to traverse HTML DOM, make
animations, add Ajax interaction, manipulate the page content, change the style
and provide cool UI effect. It is one of the most popular client side library
and as per a survey it runs on every second website.
Q2. Why do we use
jQuery?
Ans: Due to following
advantages.
Easy to use and learn.
Easily expandable.
Cross-browser support (IE 6.0+, FF 1.5+,
Safari 2.0+, Opera 9.0+)
Easy to use for DOM manipulation and
traversal.
Large pool of built in methods.
AJAX Capabilities.
Methods for changing or applying CSS, creating
animations.
Event detection and handling.
Tons of plug-ins for all kind of needs.
Q3. How JavaScript
and jQuery are different?
Ans: JavaScript is a language
While jQuery is a library built in the JavaScript language that helps to use
the JavaScript language.
Q4. Is jQuery
replacement of Java Script?
Ans: No. jQuery is not a replacement of JavaScript.
jQuery is a different library which is written on top of JavaScript. jQuery is
a lightweight JavaScript library that emphasizes interaction between JavaScript
and HTML.
Q5. Is jQuery a
library for client scripting or server scripting?
Ans. Client side scripting.
Q6. Is jQuery a W3C
standard?
Ans: No. jQuery is not a W3C
standard.
Q7. What is the
basic need to start with jQuery?
Ans: To start with jQuery,
one need to make reference of it's library. The latest version of jQuery can be
downloaded from jQuery.com.
Q8. Which is the
starting point of code execution in jQuery?
Ans: The starting point of
jQuery code execution is $(document).ready() function which is executed when
DOM is loaded.
Q9. What does
dollar sign ($) means in jQuery?
Ans: Dollar Sign is nothing
but it's an alias for JQuery. Take a look at below jQuery code.
$(document).ready(function(){
});
Over here $ sign can be
replaced with "jQuery" keyword.
jQuery(document).ready(function(){
});
Q10. Can we have
multiple document.ready() function on the same page?
Ans: YES. We can have any number of document.ready()
function on the same page.
Q11. Can we use our
own specific character in the place of $ sign in jQuery?
Ans: Yes. It is possible using jQuery.noConflict().
Q12. Is it possible
to use other client side libraries like MooTools, Prototype along with jQuery?
Ans: Yes.
Q13. What is
jQuery.noConflict?
Ans: As other client side
libraries like MooTools, Prototype can be used with jQuery and they also use
$() as their global function and to define variables. This situation creates
conflict as $() is used by jQuery and other library as
their global function. To overcome from such situations, jQuery has introduced jQuery.noConflict().
jQuery.noConflict();
// Use jQuery via jQuery(...)
jQuery(document).ready(function(){
jQuery("div").hide();
});
You can also use your own
specific character in the place of $ sign in jQuery.
var $j =
jQuery.noConflict();
// Use jQuery via jQuery(...)
$j(document).ready(function(){
$j("div").hide();
});
Q14. Is there any
difference between body onload() and document.ready() function?
Ans: document.ready() function is different from body onload() function for 2 reasons.
We can have more than one document.ready() function in
a page where we can have only one body onloadfunction.
document.ready() function is
called as soon as DOM is loaded where body.onload() function is called when everything gets loaded on the page
that includes DOM, images and all associated resources of the page.
Q15. What is the
difference between .js and .min.js?
Ans: jQuery library comes in
2 different versions Production and Deployment. The deployment version is also
known as minified version. So .min.js is basically the minified version of
jQuery library file. Both the files are same as far as functionality is
concerned. but .min.js is quite small in size so it loads quickly and saves
bandwidth.
Q16. Why there are
two different version of jQuery library?
Ans: jQuery library comes in
2 different versions.
Production
Deployment
The production version is
quite useful at development time as jQuery is open source and if you want to
change something then you can make those changes in production version. But the
deployment version is minified version or compressed version so it is impossible
to make changes in it. Because it is compressed, so its size is very less than
the production version which affects the page load time.
Q17. What is a CDN?
Ans: A content delivery
network or content distribution network (CDN) is a large distributed system of
servers deployed in multiple data centers across the Internet. The goal of a
CDN is to serve content to end-users with high availability and high performance.
Q18. Which are the
popular jQuery CDN? and what is the advantage of using CDN?
Ans: There are 3 popular
jQuery CDNs.
1. Google.
2. Microsoft
3. jQuery.
Advantage of using CDN.
It reduces the load from your server.
It saves bandwidth. jQuery framework will load
faster from these CDN.
The most important benefit is it will be
cached, if the user has visited any site which is using jQuery framework from
any of these CDN
Q19. How to load
jQuery from CDN?
Ans: Below is the code to
load jQuery from all 3 CDNs.
Code to load jQuery Framework from Google CDN
<script type="text/javascript"
src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js">
</script>
Code to load jQuery Framework
from Microsoft CDN
<script type="text/javascript"
src="http://ajax.microsoft.com/ajax/jquery/jquery-1.9.1.min.js">
</script>
Code to load jQuery Framework
from jQuery Site(EdgeCast CDN)
<script type="text/javascript"
src="http://code.jquery.com/jquery-1.9.1.min.js">
</script>
Q20. How to load
jQuery locally when CDN fails?
Ans: It is a good approach to
always use CDN but sometimes what if the CDN is down (rare possibility though)
but you never know in this world as anything can happen.
Below given jQuery code checks whether jQuery is
loaded from Google CDN or not, if not then it references the jQuery.js file
from your folder.
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript">
if (typeof
jQuery == 'undefined')
{
document.write(unescape("%3Cscript
src='Scripts/jquery.1.9.1.min.js' type='text/javascript'%3E%3C/script%3E"));
}
</script>
It first loads the jQuery
from Google CDN and then check the jQuery object. If jQuery is not loaded
successfully then it will references the jQuery.js file from hard drive
location. In this example, the jQuery.js is loaded from Scripts folder.
Q21. What are
selectors in jQuery and how many types of selectors are there?
Ans: To work with an element
on the web page, first we need to find them. To find the html element in jQuery
we use selectors. There are many types of selectors but basic selectors are:
Name: Selects all elements which match with
the given element Name.
#ID: Selects a single element which matches
with the given ID
.Class: Selects all elements which match with
the given Class.
Universal (*): Selects all elements available
in a DOM.
Multiple Elements E, F, G: Selects the
combined results of all the specified selectors E, F or G.
Attribute Selector: Select elements based on
its attribute value.
Q22. How do you
select element by ID in jQuery?
Ans: To select element use ID
selector. We need to prefix the id with "#" (hash symbol). For
example, to select element with ID "txtName", then syntax would be,
$('#txtName')
Q23. What does
$("div") will select?
Ans: This will select all the
div elements on page.
Q24. How to select
element having a particular class (".selected")?
Ans: $('.selected'). This selector is known as class selector. We need to prefix
the class name with "." (dot).
Q25. What does
$("div.parent") will select?
Ans: All the div element with
parent class.
Q26. What are the
fastest selectors in jQuery?
Ans: ID and element selectors
are the fastest selectors in jQuery.
Q27. What are the
slow selectors in jQuery?
Ans: class selectors are the
slow compare to ID and element.
Q28. How jQuery
selectors are executed?
Ans: Your last selectors is
always executed first. For example, in below jQuery code, jQuery will first
find all the elements with class ".myCssClass" and after that it will reject all the
other elements which are not in "p#elmID".
$("p#elmID .myCssClass");
Q29. Which is fast
document.getElementByID('txtName') or $('#txtName').?
Ans: Native JavaScipt is
always fast. jQuery method to select txtName "$('#txtName')" will internally makes a call todocument.getElementByID('txtName'). As jQuery is written on top of JavaScript and
it internally uses JavaScript only So JavaScript is always fast.
Q30. Difference
between $(this) and 'this' in jQuery?
Ans: this and $(this) refers to the same element. The only difference is the
way they are used. 'this' is used in traditional sense, when 'this' is wrapped
in $() then it becomes a jQuery object and you are able to use
the power of jQuery.
$(document).ready(function(){
$('#spnValue').mouseover(function(){
alert($(this).text());
});
});
In below example, this is an
object but since it is not wrapped in $(), we can't use jQuery method and use the native
JavaScript to get the value of span element.
$(document).ready(function(){
$('#spnValue').mouseover(function(){
alert(this.innerText);
});
});
Q31. How do you
check if an element is empty?
Ans: There are 2 ways to
check if element is empty or not. We can check using ":empty"
selector.
$(document).ready(function(){
if ($('#element').is(':empty')){
//Element is empty
}
});
And the second way is using
the "$.trim()" method.
$(document).ready(function(){
if($.trim($('#element').html())=='') {
//Element is empty
}
});
Q32. How do you
check if an element exists or not in jQuery?
Ans: Using jQuery length
property, we can ensure whether element exists or not.
$(document).ready(function(){
if ($('#element').length > 0){
//Element exists
});
});
Q33. What is the
use of jquery .each() function?
Ans: The $.each() function is used to iterate over a jQuery object. The $.each() function can be used to iterate over any collection,
whether it is an object or an array.
Q34. What is the
difference between jquery.size() and jquery.length?
Ans: jQuery .size() method returns number of element in the object. But it
is not preferred to use the size()method as jQuery provide .length property and which does the same thing. But the .length property is preferred because it does not have the
overhead of a function call.
Q35. What is the
difference between $('div') and $('<div/>') in jQuery?
Ans: $('<div/>') : This
creates a new div element. However this is not added to DOM tree unless you
don't append it to any DOM element.
$('div') : This selects all the div element
present on the page.
Q36. What is the
difference between parent() and parents() methods in jQuery?
Ans: The basic difference is
the parent() function travels only one level in the DOM tree, where
parents() function search through the whole DOM tree.
Q37. What is the
difference between eq() and get() methods in jQuery?
Ans: eq() returns the element as a jQuery object. This method
constructs a new jQuery object from one element within that set and returns it.
That means that you can use jQuery functions on it.
get() return a DOM element. The method retrieve the DOM
elements matched by the jQuery object. But as it is a DOM element and it is not
a jQuery-wrapped object. So jQuery functions can't be used. Find out more here.
Q38. How do you
implement animation functionality?
Ans: The .animate() method
allows us to create animation effects on any numeric CSS property. This method
changes an element from one state to another with CSS styles. The CSS property
value is changed gradually, to create an animated effect.
Syntax is:
(selector).animate({styles},speed,easing,callback)
styles: Specifies one or more CSS
properties/values to animate.
duration: Optional. Specifies the speed of the
animation.
easing: Optional. Specifies the speed of the
element in different points of the animation. Default value is
"swing".
callback: Optional. A function to be executed
after the animation completes.
Simple use of animate
function is,
$("btnClick").click(function(){
$("#dvBox").animate({height:"100px"});
});
Q39. How to disable
jQuery animation?
Ans: Using jQuery property
"jQuery.fx.off", which when set to true, disables
all the jQuery animation. When this is done, all animation methods will
immediately set elements to their final state when called, rather than
displaying an effect.
Q40. How do you
stop the currently-running animation?
Ans: Using jQuery ".stop()" method.
Q41. What is the
difference between .empty(), .remove() and .detach() methods in jQuery?
Ans: All these methods .empty(), .remove() and .detach() are used for removing elements from DOM
but they all are different.
.empty(): This method removes all the child element of the matched
element where remove() method removes set of matched elements from DOM.
.remove(): Use .remove() when you want to remove the element
itself, as well as everything inside it. In addition to the elements
themselves, all bound events and jQuery data associated with the elements are
removed.
.detach(): This method is the same as .remove(), except that .detach() keeps all jQuery data associated with the
removed elements. This method is useful when removed elements are to be
reinserted into the DOM at a later time.
Q42. Explain
.bind() vs .live() vs .delegate() vs .on()
Ans: All these 4 jQuery
methods are used for attaching events to selectors or elements. But they all
are different from each other.
.bind(): This is the easiest and quick method to bind
events. But the issue with bind() is that it doesn't work for elements added
dynamically that matches the same selector. bind() only attach events to the current
elements not future element. Above that it also has performance issues when
dealing with a large selection.
.live(): This method overcomes the disadvantage of bind(). It works for dynamically added elements or future elements.
Because of its poor performance on large pages, this method is deprecated as of
jQuery 1.7 and you should stop using it. Chaining is not properly supported
using this method.
.delegate(): The .delegate() method behaves in a similar
fashion to the .live() method, but instead of attaching the selector/event
information to the document, you can choose where it is anchored and it also
supports chaining.
.on(): Since live was deprecated with 1.7, so new method was
introduced named ".on()". This method provides all the goodness of
previous 3 methods and it brings uniformity for attaching event handlers.
Q43. What is wrong
with this code line "$('#myid.3').text('blah blah!!!');"
Ans: The problem with above
statement is that the selectors is having meta characters and to use any of the
meta-characters ( such as !"#$%&'()*+,./:;<=>?@[\]^`{|}~ ) as a
literal part of a name, it must be escaped with with two backslashes: \\. For
example, an element with id="foo.bar", can use the selector
$("#foo\\.bar").
So the correct syntax is,
$('#myid\\.3').text('blah
blah!!!');
Q44. How to create
clone of any object using jQuery?
Ans: jQuery provides clone() method which performs a deep copy of the set of matched
elements, meaning that it copies the matched elements as well as all of their
descendant elements and text nodes.
$(document).ready(function(){
$('#btnClone').click(function(){
$('#dvText').clone().appendTo('body');
return false;
});
});
Q45. Does events
are also copied when you clone any element in jQuery?
Ans: As explained in previous
question, using clone() method, we can create clone of any
element but the default implementation of the clone() method doesn't copy events unless you tell the clone() method to copy the events. The clone() method takes a parameter, if you pass true then it will
copy the events as well.
$(document).ready(function(){
$("#btnClone").bind('click', function(){
$('#dvClickme').clone(true).appendTo('body');
});
Q46. What is
difference between prop and attr?
Ans: attr(): Get the value of an attribute for the first element in the
set of matched elements. Whereas,.prop(): (Introduced in jQuery 1.6) Get the value of a
property for the first element in the set of matched elements.
Attributes carry additional information about an
HTML element and come in name="value" pairs. Where Property is a
representation of an attribute in the HTML DOM tree. once the browser parse
your HTML code ,corresponding DOM node will be created which is an object thus
having properties.
attr() gives you the value of element as it was defines in the
html on page load. It is always recommended to useprop() to get values of elements which is modified via
javascript/jquery , as it gives you the original value of an element's current
state. Find out more here.
Q47. What is
event.PreventDefault?
Ans: The event.preventDefault() method stops the default action of an
element from happening. For example, Prevents a link from following the URL.
Q48. What is the
difference between event.PreventDefault and event.stopPropagation?
Ans: event.preventDefault(): Stops the default action of an element from
happening.
event.stopPropagation(): Prevents the event from bubbling up the DOM
tree, preventing any parent handlers from being notified of the event. For
example, if there is a link with a click method attached inside of a DIV or
FORM that also has a click method attached, it will prevent the DIV or FORM
click method from firing.
Q49. What is the
difference between event.PreventDefault and "return false"?
Ans: e.preventDefault() will prevent the default event from occurring, e.stopPropagation() will prevent the event from bubbling up and return
false will do both.
Q50. What is the
difference between event.stopPropagation and event.stopImmediatePropagation?
Ans: event.stopPropagation() allows other handlers on the same element
to be executed, whileevent.stopImmediatePropagation() prevents every event from running. For
example, see below jQuery code block.
$("p").click(function(event){
event.stopImmediatePropagation();
});
$("p").click(function(event){
// This function won't be executed
$(this).css("background-color", "#f00");
});
If event.stopPropagation was used in previous example, then the
next click event on p element which changes the css will fire, but in case event.stopImmediatePropagation(), the next p click event will not fire.
Q51. How to check
if number is numeric while using jQuery 1.7+?
Ans: Using "isNumeric()" function which was introduced with
jQuery 1.7.
Q52. How to check
data type of any variable in jQuery?
Ans: Using $.type(Object) which returns the built-in JavaScript
type for the object.
Q53. How do you
attach a event to element which should be executed only once?
Ans: Using jQuery one() method. This attaches a handler to an event for the
element. The handler is executed at most once per element. In simple terms, the
attached function will be called only once.
$(document).ready(function()
{
$("#btnDummy").one("click", function() {
alert("This will be displayed only once.");
});
});
Q54. Can you
include multiple version of jQuery? If yes, then how they are executed?
Ans: Yes. Multiple versions
of jQuery can be included in same page.
Q55. In what
situation you would use multiple version of jQuery and how would you include
them?
Ans: Well, it is quite
possible that the jQuery plugins which are used are dependent on older version
but for your own jQuery code, you would like to use newer version. So because
of this dependency, multiple version of jQuery may required sometimes on single
page.
Below code shows how to include multiple version
of jQuery.
<script type='text/javascript'
src='js/jquery_1.9.1.min.js'></script>
<script type='text/javascript'>
var
$jq = jQuery.noConflict();
</script>
<script type='text/javascript'
src='js/jquery_1.7.2.min.js'></script>
By this way, for your own
jQuery code use "$jq", instead of "$" as "$jq"
refers to jQuery 1.9.1, where "$" refers to 1.7.2.
Q56. Is it possible
to hold or delay document.ready execution for sometime?
Ans: Yes, its possible. With
Release of jQuery 1.6, a new method "jQuery.holdReady(hold)" was introduced. This method allows to
delay the execution of document.ready() event. document.ready() event is called as soon as your DOM is ready but
sometimes there is a situation when you want to load additional JavaScript or
some plugins which you have referenced.
$.holdReady(true);
$.getScript("myplugin.js", function() {
$.holdReady(false);
});
Q57. What is
chaining in jQuery?
Ans: Chaining is one of the
most powerful feature of jQuery. In jQuery, Chaining means to connect multiple
functions, events on selectors. It makes your code short and easy to manage and
it gives better performance. The chain starts from left to right. So left most
will be called first and so on.
$(document).ready(function(){
$('#dvContent').addClass('dummy');
$('#dvContent').css('color', 'red');
$('#dvContent').fadeIn('slow');
});
The above jQuery code sample
can be re-written using chaining. See below.
$(document).ready(function(){
$('#dvContent').addClass('dummy')
.css('color', 'red')
.fadeIn('slow');
});
Not only functions or
methods, chaining also works with events in jQuery. Find out more here.
Q58. How does
caching helps and how to use caching in jQuery?
Ans: Caching is an area which
can give you awesome performance, if used properly and at the right place.
While using jQuery, you should also think about caching. For example, if you
are using any element in jQuery more than one time, then you must cache it. See
below code.
$("#myID").css("color",
"red");
//Doing some other stuff......
$("#myID").text("Error occurred!");
Now in above jQuery code, the
element with #myID is used twice but without caching. So
both the times jQuery had to traverse through DOM and get the element. But if
you have saved this in a variable then you just need to reference the variable.
So the better way would be,
var $myElement = $("#myID").css("color",
"red");
//Doing some other stuff......
$myElement.text("Error occurred!");
So now in this case, jQuery
won't need to traverse through the whole DOM tree when it is used second time.
So in jQuery, Caching is like saving the jQuery selector in a variable. And
using the variable reference when required instead of searching through DOM
again.
Q59. You get
"jquery is not defined" or "$ is not defined" error. What
could be the reason?
Ans: There could be many
reasons for this.
You have forgot to include the reference of
jQuery library and trying to access jQuery.
You have include the reference of the jQuery
file, but it is after your jQuery code.
The order of the scripts is not correct. For
example, if you are using any jQuery plugin and you have placed the reference
of the plugin js before the jQuery library then you will face this error.
Q60. How to write
browser specific code using jQuery?
Ans: Using jQuery.browser
property, we can write browser specific code. This property contains flags for
the useragent, read from navigator.userAgent. This property was removed in
jQuery 1.9.
Q61. Can we use
jQuery to make ajax request?
Ans: Yes. jQuery can be used
for making ajax request.
Q62. What are
various methods to make ajax request in jQuery?
Ans: Using below jQuery
methods, you can make ajax calls.
load() : Load a piece
of html into a container DOM
$.getJSON(): Load JSON with GET
method.
$.getScript(): Load a
JavaScript file.
$.get(): Use to make a GET
call and play extensively with the response.
$.post(): Use to make a POST
call and don't want to load the response to some container DOM.
$.ajax(): Use this to do
something on XHR failures, or to specify ajax options (e.g. cache: true) on the
fly.
Q63. Is there any
advantage of using $.ajax() for ajax call against $.get() or $.post()?
Ans: By using jQuery post()/ jQuery get(), you always trust the response from the server
and you believe it is going to be successful all the time. Well, it is
certainly not a good idea to trust the response. As there can be n number of
reason which may lead to failure of response.
Where jQuery.ajax() is jQuery's low-level AJAX
implementation. $.get and $.post are higher-level abstractions that are
often easier to understand and use, but don't offer as much functionality (such
as error callbacks). Find out more here.
Q64. What are
deferred and promise object in jQuery?
Ans: Deferred and promise are
part of jQuery since version 1.5 and they help in handling asynchronous
functions like Ajax. Find out more here.
Q65. Can we
execute/run multiple Ajax request simultaneously in jQuery? If yes, then how?
Ans: Yes, it is possible to
execute multiple Ajax request simultaneously or in parallel. Instead of waiting
for first ajax request to complete and then issue the second request is time consuming.
The better approach to speed up things would be to execute multiple ajax
request simultaneously.
Using jQuery .when() method which provides a way to execute callback
functions based on one or more objects, usually Deferred objects that represent
asynchronous events. Find out more here.
Q66. Can you call
C# code-behind method using jQuery? If yes,then how?
Ans: Yes. We can call C#
code-behind function via $.ajax. But for do that it is compulsory to mark the
method as WebMethod.
Q67. Which is the
latest version of jQuery library?
Ans: The latest version (when
this post is written) of jQuery is 1.10.2 or 2.0.3. jQuery 2.x has the same API
as jQuery 1.x, but does not support Internet Explorer 6, 7, or 8.
Q68. Does jQuery
2.0 supports IE?
Ans: No. jQuery 2.0 has no
support for IE 6, IE 7 and IE 8.
Q69. What are
source maps in jQuery?
Ans: In case of jQuery,
Source Map is nothing but mapping of minified version of jQuery against the
un-minified version. Source map allows to debug minified version of jQuery
library. Source map feature was release with jQuery 1.9. Find out more here.
Q70. How to use
migrate jQuery plugin?
Ans: with release of 1.9
version of jQuery, many deprecated methods were discarded and they are no
longer available. But there are many sites in production which are still using
these deprecated features and it's not possible to replace them overnight. So
jQuery team provided with jQuery Migrate plugin that makes code written prior
to 1.9 work with it.
So to use old/deprecated features, all you need
to do is to provide reference of jQuery Migrate Plugin. Find out morehere.
Q71. Is it possible
to get value of multiple CSS properties in single statement?
Ans: Well, before jQuery 1.9
release it was not possible but one of the new feature of jQuery 1.9 was .css() multi-property getter.
var propCollection = $("#dvBox").css([ "width",
"height", "backgroundColor" ]);
In this case, the propCollection will be an array and it will look something like this.
{
width: "100px",
height: "200px",
backgroundColor: "#FF00FF"
}
Q72. How do you
stop the currently-running animation, remove all queued animations, and
complete all animations for the matched elements?
Ans: It can be done via
calling .stop([clearQueue ] [,
jumpToEnd ]) method and by passing
both the parameters as true.
Q73. What is finish
method in jQuery?
Ans: The .finish() method
stops all queued animations and places the element(s) in their final state.
This method was introduced in jQuery 1.9.
Q74. What is the
difference between calling stop(true,true) and finish method?
Ans: The .finish() method is
similar to .stop(true, true) in that it clears the queue and the current
animation jumps to its end value. It differs, however, in that .finish() also
causes the CSS property of all queued animations to jump to their end values,
as well.
Q75. Consider a
scenario where things can be done easily with javascript, would you still
prefer jQuery?
Ans: No. If things can be
done easily via CSS or JavaScript then You should not think about jQuery.
Remember, jQuery library always comes with xx kilobyte size and there is no
point of wasting bandwidth.
Q76. Can we use
protocol less URL while referencing jQuery from CDNs?
Ans: Yes. Below code is
completely valid.
<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
Q77. What is the
advantage of using protocol less URL while referencing jQuery from CDNs?
Ans: It is quite useful when
you are moving from HTTP to HTTPS url. You need to make sure that correct
protocol is used for referencing jQuery library as pages served via SSL should
contain no references to content served through unencrypted connections.
"protocol-less" URL is the best way to
reference third party content that’s available via both HTTP and HTTPS. When a
URL’s protocol is omitted, the browser uses the underlying document’s protocol
instead. Find out more here.
Q78. What is jQuery
plugin and what is the advantage of using plugin?
Ans: A plug-in is piece of
code written in a standard JavaScript file. These files provide useful jQuery
methods which can be used along with jQuery library methods. jQuery plugins are
quite useful as its piece of code which is already written by someone and
re-usable, which saves your development time.
Q79. What is jQuery
UI?
Ans: jQuery UI is a curated
set of user interface interactions, effects, widgets, and themes built on top
of the jQuery JavaScript Library that can be used to build interactive web
applications.
Q80. What is the
difference between jQuery and jQuery UI?
Ans: jQuery is the core
library. jQueryUI is built on top of it. If you use jQueryUI, you must also
include jQuery.
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