Interview Questions.

Top 100+ Advanced Jquery Interview Questions And Answers

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Top 100+ Advanced Jquery Interview Questions And Answers

Question 1. What Is Jquery?

Answer :

Jquery is javascript library and it's far used for HTML DOM access (manipulating and traversing of HTML DOM elements). It offers most powerful function of event coping with as properly.

Question 2. Explain We Can Use Jquery?

Answer :

Jquery may be used along with different libraries. It works with easy and complicated javascript and AJAX.

HTML Interview Questions
Question three. How We Can Use Jquery In Asp.Net?

Answer :

We can use Jquery by way of downloading the jquery and use it in our venture or can use CDNs available from Google, Microsoft and deliver the CDN URL in ASPX web page.

Question 4. Explain Difference Between Jquery And Javascript?

Answer :

query is a library and Javascript is a language and Jquery presents complete-fledged guide for javascript language.

HTML Tutorial
Question 5. What Is The Significance Of ‘$’ Sign In Jquery?

Answer :

‘$’ is used as an alias for jquery.

Below are the examples of the way we will use it:

Eg: $(‘#MyControl’)

Java Script Interview Questions
Question 6. What Are The Differences Between “body.Onload” And “file.Geared up” Methods?

Answer :

“frame.Onload” method may be used most effective as soon as in a page where as “file.Equipped” technique may be used more than one times in a same page. “body.Onload” approach will be called as soon as all the assets of the page are loaded. (pics, css and DOM).
But “file.Equipped” method called once DOM is prepared and it does not wait till different sources are loaded.
Question 7. Why We Can Use Jquery In Our Application?

Answer :

Below are the main reasons in which we are able to use Jquery:

To observe the css for the controls.
To provide computer graphics for the controls.
Event Handling.
To offer the AJAX aid.
Java Script Tutorial Core Java Interview Questions
Question eight. How We Can Hide And Show The Controls In Jquery?

Answer :

Access the control the use of ‘$’ and use the strategies “Hide()” and “Show()” like under.

For instance:

$(‘#MyControl’).Hide()

$(‘#MyControl’).Show()

Question nine. How To Show The Alert Message On Button Click In Jquery?

Answer :

Jquery is one of the maximum effective libraries what we have and it offers occasion handling. This scenario may be handled by using “OnClick” of the button. Below is the code snippet –

<input type=”button” id=”myButton” onclick=”alert(‘Hi’)” />

Zend Interview Questions
Question 10. What Is The Meaning Of Selectors In Jquery?

Answer :

In javascript we've numerous techniques to locate the controls like – “getElementByName” and “getElementByID”, that is used to locate the control based totally on Name of the manage and ID of the manipulate respectively. Similarly in Jquery we've locate the controls the use of selectors. Below are some of the selectors -

“*” - To Find all of the factors of the page.
“#” – Used to locate the manage via ID.
“.” - Used to discover the manage with the aid of Class.
Core Java Tutorial
Question eleven. In Asp.Net, Jquery Will Be Added In Content And Master Pages Both?

Answer :

No. If the Jquery file added in grasp page then content material pages will going to use that.

CodeIgniter Interview Questions
Question 12. What Is The Advantage Of Using Minified Version Of Jquery?

Answer :

Advantage of the use of minified verison of Jquery will especially be overall performance. Size of the minified jquery record can be around 76KB in which because the ordinary Jquery document length may be round 180KB.

HTML Interview Questions
Question thirteen. Can You Give An Example Of Selecting An Element Based On Its Class Name ?

Answer :

Below is the sample code snippet:

$(‘.MyControl’).Hide()

Zend Tutorial
Question 14. What Are The Difference Between “period” And “length” In Jquery?

Answer :

Both are used to find variety of factors in an item. “Length” will be used normally as it’s quicker as compared to “size” because “duration” is a assets and “length” is a method.

Question 15. How Can We Set The Page Title In Jquery?

Answer :

Below is the code snippet used to set the page title:

$(function()

$(file).Attr(“name”, “A4 Academics”);

);

JqueryUI Interview Questions
Question 16. What Is The Use Of Jquery Connect?

Answer :

Connect technique is used to bind one characteristic to every other and it’s used to execute the function whilst a feature is done from some other object.

CodeIgniter Tutorial
Question 17. How To Use Ajax In Jquery?

Answer :

Jquery supports AJAX calls, underneath is the code snippet of AJAX in Jquery –

$.Ajax(

url: ‘MyURL',

fulfillment: function(reaction) 

//My Code is going here

,

blunders: feature(err) 

//My Code is going here 

);

jQuery Mobile Interview Questions
Question 18. What Is “noconflict” Method In Jquery?

Answer :

Jquery.Conflict approach is utilized in case other purchaser facet libraries used along side Jquery then we are able to use this method.

Eg: Prototype.Js can be used with Jquery and this Prototype.Js also uses “$” symbol for gaining access to the detail. So for this purpose we're using Jquery.Conflict approach.

Java Script Interview Questions
Question 19. What You Mean By Cdn?

Answer :

CDN is known as – “Content Distribution Network”, that's a network of servers that's deployed in big records middle and can be accessed the usage of internet.

JqueryUI Tutorial
Question 20. Explain The Advantages Of Using Cdns?

Answer :

Below are the benefits of the usage of CDNs:

Performance can be improved as there might no longer be a good deal load on server.
Jquery libraries could be loaded quicker.
Caching for the Jquery libraries might be enabled on use of CDNs.
JSON (JavaScript Object Notation) Interview Questions
Question 21. Which Providers Will Give Jquery Cdns?

Answer :

Following are the list of carriers gives CDNs for Jquery library:

Microsoft
Google
Jquery
Question 22. Explain The Difference Between “this” And “$(this)” In Jquery?

Answer :

“this” refers back to the modern element within the scope. “this” might be utilized in traditional javascript and “$(“this”)” if used then we will get the benefits of Jquery methods.

For instance:

Using “$(this)” -

$(document).Prepared(characteristic()

$('#mycontrolid').Alternate(feature()

alert($(this).Text());

);

);

Using “this” -

$(record).Prepared(characteristic()

$('# mycontrolid'').Change(function()

alert(this.InnerText);

);

);

JSON (JavaScript Object Notation) Tutorial
Question 23. How We Can Check Element Empty In Jquery?

Answer :

$(report).Geared up(characteristic()

if ($('#mycontrolid’).Is(':empty'))

//Code right here for Empty element

);

Java J2EE Technical Support Engineer Interview Questions
Question 24. How We Can Check Element Exists Or Not In Jquery?

Answer :

$(record).Equipped(characteristic()

if ($('# mycontrolid’).Period > 0)

//Code Here if detail exists.

);

);

Core Java Interview Questions
Question 25. How We Can Use “each” Function In Jquery?

Answer :

For iterating over objects we are able to be using this approach. Each feature uses “length” property of the object internally. Index and Text of each item can be fetched at some point of new release.

Question 26. What Are The Differences Between “parents” And “parent” Methods?

Answer :

In DOM structure “mother and father” approach is used to traverse all along the DOM tree, whereas “determine” method is used to traverse simplest one level.

Asp Dot Net Mvc Interview Questions
Question 27. Explain “empty” Method In Jquery?

Answer :

Empty method is normally used to do away with the kid factors and the text related to the factors.

For instance:

Hi, A4 Academics. 
In the above scenario nothing may be proven in UI as all the infant controls and textual content could be removed.

Zend Interview Questions
Question 28. How We Can Check/uncheck Radio Buttons In Jquery?

Answer :

Below is the code snippet to check/uncheck radio buttons:

// Check #mycontrolid

$('#mycontrolid').Attr('checked', real);

// Uncheck #mycontrolid

$('#mycontrolid').Attr('checked', false);

Question 29. Explain The Difference Between “stay” And “bind” Methods In Jquery?

Answer :

“bind” and “live” techniques are used to connect the events for the controls however there are pros and cons for each. 
“bind” – This approach is used to connect the occasions for the factors that are static. We can't connect the occasions for the dynamic elements.
“stay” – “live” approach helps dynamic detail event dealing with. But it has performance troubles in case you used all alongside the web page.
Question 30. What Is The Use Of “clone” Method In Jquery?

Answer :

“clone” method is used to replicate the matched factors. So all its little ones also are being copied in conjunction with the figure element.

For example:

$(file).Prepared(feature()

$('#mycontrolid').Click on(characteristic()

$('#mySpan').Clone().PrependTo("div");;

return fake;

);

);

Question 31. What Is The Use Of “event.Preventdefault” In Jquery?

Answer :

This method is used to prevent the default movement from occurring.

For instance:

$("#mycontrolid").Click(function(occasion)

event.PreventDefault();

);

Question 32. What Is The Use Of “occasion.Stoppropagation” In Jquery?

Answer :

This approach is used to stop the occasion effervescent from the child factors. It prevents determine being notified to the child activities.

Method – “event.IsPropagationStopped()” can be used to test whether or not approach – “stopPropagation” turned into known as or no longer.

Question 33. What Does $("div.Determine") Will Select?

Answer :

It way pick out all of the div elements with magnificence – “figure”.

CodeIgniter Interview Questions
Question 34. Which Methods Are Used To Provide Effects?

Answer :

Below are a number of the techniques used:

Toggle()
FadeIn()
FadeOut()
Hide()
Show()
Question 35. Explain Methods “teenagers” And “discover” In Jquery?

Answer :

“Childrens” technique is used to discover the child controls of the detail but its limited to best one degree in which as “locate” method can be used to find the controls in any degree in DOM tree.

Question 36. Why To Use “information” Method In Jquery?

Answer :

“statistics” method is used to attach the information to the elements in DOM. When the element is removed data additionally could be removed.

For example:

jQuery.Facts( record.Body, "a4academics", forty );

JqueryUI Interview Questions
Question 37. What Is The Use Of Validation Jquery Plugins?

Answer :

In MVC we are able to use those Jquery Plugins in the shape of rules like underneath -

$('#MyControlId').Policies("add", 

required: authentic

);

Question 38. How We Can Implement Animation Effects In Jquery?

Answer :

“Animate” technique is used for animation in Jquery. This method is used to change the element look and sense and provide more consequences to the elements.

For example:

$("#MyControlID").Animate(peak:"45px");

Question 39. Which Method To Be Used To Stop The Animation?

Answer :

In Jquery, we must use the technique referred to as – “forestall()” to prevent the animation.

Question forty. How Can We Disable The Animation?

Answer :

We can use the assets – “fx.Off” to disable the Jquery animation. Set the property value to genuine then it will disable the animation in Jquery.

JQuery Mobile Interview Questions
Question 41. What Is The Use Of Clone Method And Give An Example To Create It In Jquery?

Answer :

“Clone” method is used to clone the set of controls, which basically way to replicate the set of factors that are matched on selectors. It copies the descendant factors along with the parent element.

For instance:

$(file).Geared up(feature()

$('#mycontrolid').Click(function()

$('#mycontrolid').Clone().AppendTo('body');

return fake;

);

);

Question 42. Will Events Are Also Copied On Clone In Jquery?

Answer :

By Default “clone” technique does not clone the activities unless it is being informed to replicate. When “clone” method is being advised to clone the activities additionally then along side elements, occasions are also being copied. “Clone”method takes a Boolean parameter, pass genuine in clone method to copy the occasions like under -

$('#mycontrolid').Clone(real).AppendTo('frame');

JSON (JavaScript Object Notation) Interview Questions
Question forty three. Explain The Difference Between “attr” And “prop” In Jquery?

Answer :

Attr() – This approach is used to get the fee of characteristic of first detail.
Prop() – This approach is used to get the price of first element assets.
Question forty four. Can We Include Different Versions Of Jquery In Web Page?

Answer :

Yes. We can include unique versions of Jquery in same page.

Question 45. How We Can Delay The Execution Of Document.Ready Method In Jquery?

Answer :

We can use technique – “holdReady” for this cause. Below is the pattern code snippet –

$.HoldReady(authentic);

Question forty six. Explain Chaining?

Answer :

This is one of the effective or strong characteristic of Jquery. Chaining method connecting a couple of activities/ selectors/ capabilities. Advantage of this would be – code may be smooth to manage and suitable overall performance. Chain starts from left.

Question forty seven. Can You Give An Example For Chaining Along With Code Snippet?

Answer :

Below is the pattern code snippet:

Old Code:

$(record).Equipped(function()

$('#MyControlID').AddClass('check');

$('#MyControlID').Css('colour', 'yellow');

$('#MyControlID').FadeIn('speedy');

);

New Code after chaining:

$(record).Ready(feature()

$('#MyControlID').AddClass('test')

.Css('color', 'yellow')

.FadeIn('fast'); 

);

Question 48. Explain Caching In Jquery?

Answer :

Caching is temporary memory to save the facts, which increases the performance of the utility. So in Jquery we are able to use the same idea to save the statistics rather than repeating as shown under:

Old Code:

$('#MyControlID').AddClass('take a look at');

$('#MyControlID').Css('color', 'yellow');

New Code for caching:

var $mycontrol = $("#MyControlID").Css("colour", "purple");

//Do somre stuffs right here

$mycontrol.Text("Error took place!");

Question forty nine. How We Can Write Code Specific To Browser In Jquery?

Answer :

By using the assets – “Jquery.Browser” we will write the browser precise code.

Question 50. Will Jquery Support Ajax ? Mention Some Ajax Methods Which Can Be Used In Jquery?

Answer :

Yes. Jquery helps AJAX.

Below are a number of the techniques of AJAX:

Get()
Post()
GetJSON()
Ajax()
Question fifty one. How We Can Get The Value Of Multiple Css In Single Statement Of Jquery?

Answer :

Below is the pattern code to provide an explanation for:

var Mypropertiescollection = $("#MyControlID").Css([ "height", "width", "backgroundColor" ]);

In the above code snippet variable – “Mypropertiescollection” can have array like below –

peak: "100px",

width: "200px", 

backgroundColor: "#FF01EF"

Question fifty two. Explain Finish Method In Jquery?

Answer :

“end” method is used to forestall the animations of the factors and bring the factors to its final nation.

Question fifty three. What Are The Parameters Which Are Being Used In Ajax Jquery?

Answer :

Below are the listing of four parameters which might be utilized in AJAX calls –

Type
Cache
Data
URL
Question fifty four. Can We Debug Jquery? If Yes, How Can We Do That?

Answer :

Yes. We can debug Jquery document by using the usage of “debugger” key-word. We can add the “debugger” key-word to the road of Jquery document in which we must debug.

Question fifty five. Write A Code Snippet To Sort String Array In Jquery?

Answer :

Below is the code snippet that's used to kind the string array –

$(report).Geared up(function()

var a4acarray = [ “Apple”,”Orange”,”Banana”];

sortedarray = a4acarray.Kind();

$(“#mycontrolID”).Html(sortedarray.Be a part of(“”));

);

Question fifty six. Explain “resize” Method In Jquery?

Answer :

“Resize” method used with window object. This approach will be fired while the size of the browser window adjustments. For instance

$( window ).Resize(function() 

$( "#myControlID" ).Append( "<div>Test Content</div>" );

);

As in keeping with above snippet whilst browser window’s size modifications, content material can be appended to the control – “myControlID”.

Question 57. How To Get The Selected Value Of Dropdown In Jquery?

Answer :

Below is the pattern code to bind to dropdown (selected) –

<select id="myControlID">

<option value="1">AA</option>

<option value="2">BB</option>

<option value="3">CC</option>

<option value="4">DD</option>

</select>

Get the selected price –

$("#myControlID choice:decided on").Textual content();

Question 58. How To Disable Elements Using “attr” In Jquery?

Answer :

$('#myControlID').Attr('disabled', actual);

$('#myControlID').Attr('disabled', fake);

Question fifty nine. How To Check/uncheck Radio Button Using Attr In Jquery?

Answer :

$('#myControlID').Attr('checked', authentic);

$('#myControlID').Attr('checked', fake);

Question 60. Why To Use “siblings” Method? Give Sample Code To Demonstrate The Same?

Answer :

When we want to get the list of sibling factors then “sibling” technique is used on figure detail. Selectors can be used to filter out the siblings. For instance

<ul>

<li> itemA </li>

<li id=”mycontrolID”> itemB </li>

<li class=”mycontrolclass”> itemC </li>

<li class=”mycontrolclass”> itemD </li>

</ul>

$(‘li#mycontrolID’).Siblings().Css(‘colour’,’yellow’);

Question 61. What Is The Difference Between Methods - “css(‘width’)” And “width()” In Jquery?

Answer :

Both techniques are used to alternate the widths of the factors.

For instance:

$(‘#myControlID’).Css(‘width’,’150px’);

$(‘#myControlID’).Width(a hundred and fifty);

Above is the code to exchange the width of the detail to 150px. As you may see “css(width)” approach takes the width in pixels whereas for “width” technique no need to explicitly mention the width in pixels.

Question sixty two. Explain “slidetoggle” Method In Jquery?

Answer :

This approach is used to give the animation effects to the elements in Jquery. SlideToggle method makes use of following parameters:

Speed – This is an non-obligatory parameter and it specifies the speed of animation impact.
Easing - This is an optional parameter and this specifies the rate of animation effect at unique c programming language of time.
Callback – This parameter is optional and it accepts the callback function a good way to be carried out once the execution of “slideToggle” technique is finished.
Question 63. Explain “param” Method In Jquery?

Answer :

“param” approach is used for object or array within the manner of serialization. While making AJAX calls, param approach can be used to serialize the querystrings.

Question 64. Give An Example With Code Snippet For “param” Method?

Answer :

customerObj=new Object();

customerObj.Name="A4Academics";

customerObj.Designation=”IT”;

$("#myControlID").Click on(feature()

$("span").Textual content($.Param(customerObj));

);

Now the span detail may have cost like - “call=A4Academics&Designation=IT”

Question sixty five. What Is “unbind” In Jquery?

Answer :

“unbind” approach is used to dispose of the event handlers related to the detail. This method can be used with selectors to eliminate the event handlers of the chosen elements.

Question sixty six. Why To Use Jquery Dialog?

Answer :

Jquery Dialog is used like a pop up and if Jquery used in MVC then we are able to render the cshtml contents in Jquery Dialog and its used like a affirm box (as javascript) too.

Question 67. How Can We Select Elements In Two Different Classes In Jquery?

Answer :

Below is the sample code for displaying how we can do it –

$(".MyClass1.MyClass2").Css('colour','inexperienced');

Question 68. How To Select All The <span> Elements Which Has Text ‘a4academics’?

Answer :

We can pick all <span> factors using beneath code –

$("span:consists of('a4academics’')")

Question 69. How We Can Select The Specified <li> Element From The List Of <li> Elements In <ul>?

Answer :

If we need to get the 4th <li> from the list of elements in <ul> then we can write code as beneath –

$("ul li:eq(3)") // Index will begin from zero.

Question 70. In <table> Design Change The Color Of Even <tr> Elements To “inexperienced” And Change The Color Of Odd <tr> Elements To “blue” Color? Give An Example Code?

Answer :

Below is the pattern code snippet for this situation –

$("tr:even").Css('color','green')

$("tr:odd").Css('colour','blue')

Question 71. Write A Code Snippet To Select <li> Elements Which Are In Index Greater Than five And Less Than 10 In Jquery?

Answer :

Below is the code snippet for this state of affairs:

$("ul li:gt(5)").Css('shade','green')
$("ul li:lt(10)").Css('color','blue')
Question 72. Write A Code Snippet To Select All <p> Elements Which Are In All Pages Except First Page?

Answer :

Below is the code snippet for this situation:

$("p :now not(:first)")

Question seventy three. What Is Jquery In The Context Of Web Applications?

Answer :

jQuery is not anything but a set of properly written javascript code.

In different words Jquery is ready made concise and rapid JavaScript Library for use.

Question 74. What Are The Advantages Of Using Jquery Over Javascript In Asp.Internet Web Application?

Answer :

Below are the advatages of the usage of jQery over JavaScript:

Jquery is nicely written optimised javascript code so it will likely be faster in execution unless we write equal preferred optimised javascript code.
Jquery is concise java script code ,approach minimal ammount of code is to be written for the identical capability than the javascript.
Javascript related Development is fast the usage of Jquery due to the fact maximum of the functionality is already written in the library and we just want to use that.
Jquery has move browser support ,so we save time for assisting all the browsers.
Question seventy five. How To Use Jquery In Asp.Internet Web Application?

Answer :

To use jQuery in ASP.NET net application comply with the under steps:

Go to http://jquery.Com/(The reliable jQuery WebSite)
Download cutting-edge .Js jQuery record from the website. 
Put it the script(or different folder) inside the root of your internet application 
Add the below tag at the page in which you want to apply Jquery script kind="text/javascript" src="script/jQueryDownLoadedFileName.Js" /script
Question seventy six. What Is The Use Of Jquery Min Js File In Asp.Net Web Application?

Answer :

JQuery min .Js report is actully a minified model of Actual JQuery .Js. The min documents have much less size but equal content so this improves the overall performance.So You need to prefer to use min documents.

Question seventy seven. What Is The Advantages Of Use Of Document.Ready Functions In Jquery?

Answer :

Advantage of using $(record).Geared up(function () in jQuery is that the code inside this characteristic will excecute most effective whilst the full web page has been loaded in order that there can be no errors like the DOM object on which the Jquery has to execute is not loaded.

Question seventy eight. Can We Write More Than One Document.Prepared Jquery Functions In One Page?

Answer :

Yes we are able to write multiple jquery $(file).Prepared(function ()

in a single web page.This is beneficial when you have large Jquery code and you want to cut up it in more than one documents.

Question 79. How To Select An Element With Id In Jquery?

Answer :

To pick out an element with Id write as below:

var divValue = $(''#sampleDivId'').Val();

Question eighty. How To Select An Element With Class In Jquery?

Answer :

To pick out an element with class write as beneath:

$(".SampleClass").Css("border","2px strong blue");

Question 81. What Is The Difference Between Jquery Find And Children Methods?

Answer :

The difference between discover() and children() strategies
are that the youngsters most effective travels a single stage down the DOM tree
while the locate travels at all degree down the DOM tree.
Question 82. How To Use Length Function In Jquery To Text Existance Of An Element By Id?

Answer :

To take a look at if an detail exists we will use length method in jQuery as under:

if $(''#mySampleDiv'').Length )//Tests wheter the div with id mySampleDiv exists or not

$(mySampleDiv).Discover(''div'');




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