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 onload function.
- 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 to document.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.
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 use prop()
to get values of elements which is modified via javascript/jquery , as it gives
you the original value of an element's current state.
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, while event.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.
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).
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.
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.
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.
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.
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.
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.
