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To test if an ELEMENT EXISTS we can use length method in jQuery as below:

if $(''#mySampleDiv'').length )//TESTS wheter the div with ID mySampleDiv exists or not

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

To test if an element exists we can use length method in jQuery as below:

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

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

• The DIFFERENCE between find() and CHILDREN() METHODS
• are that the children only TRAVELS a single level down the DOM tree
• while the find travels at all level down the DOM tree.

To select an ELEMENT with class WRITE as below:

$(".sampleClass").css("BORDER","2PX solid blue");

To select an element with class write as below:

$(".sampleClass").css("border","2px solid blue");

To SELECT an element with ID WRITE as below:

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

To select an element with Id write as below:

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

Yes we can write more than one jquery $(DOCUMENT).READY(function ()

in one page.This is helpful when you have large Jquery code and you WANT to split it in MULTIPLE FILES.

Yes we can write more than one jquery $(document).ready(function ()

in one page.This is helpful when you have large Jquery code and you want to split it in multiple files.

Advantage of using $(document).READY(function () in jQuery is that the code inside this function will excecute only when the full page has been LOADED so that there will be no ERROR like the DOM OBJECT on which the Jquery has to execute is not loaded.

Advantage of using $(document).ready(function () in jQuery is that the code inside this function will excecute only when the full page has been loaded so that there will be no error like the DOM object on which the Jquery has to execute is not loaded.

JQUERY MIN .js FILE is actully a minified version of Actual JQuery .js. The min files have less size but same content so this improves the performance.so You should PREFER to use min files.

JQuery min .js file is actully a minified version of Actual JQuery .js. The min files have less size but same content so this improves the performance.so You should prefer to use min files.

To use jQuery in ASP.NET web application follow the below steps:

1. GO to http://jquery.com/(The official jQuery WEBSITE)
2. Download latest .js jQuery file from the website. 
3. Put it the script(or other FOLDER) in the root of your web application 
4. ADD the below TAG on the page where you want to use Jquery script type="text/javascript" src="script/jQueryDownLoadedFileName.js" /script

To use jQuery in ASP.NET web application follow the below steps:

Below are the advatages of using jQery over JAVASCRIPT:

1. JQUERY is well written optimised javascript code so it will be FASTER in execution unless we write same standard optimised javascript code.
2. Jquery is concise java script code ,means minimal AMMOUNT of code is to be written for the same functionality than the javascript.
3. Javascript related Development is fast using Jquery because most of the functionality is already written in the library and we just need to use that.
4. Jquery has cross browser support ,so we save time for supporting all the browsers.

Below are the advatages of using jQery over JavaScript:

JQUERY is nothing but a collection of well written javascript CODE.

In other WORDS Jquery is ready made concise and fast JavaScript Library to be USED.

jQuery is nothing but a collection of well written javascript code.

In other words Jquery is ready made concise and fast JavaScript Library to be used.

<P>Below is the CODE SNIPPET for this SCENARIO:

$("p :not(:FIRST)")

Below is the code snippet for this scenario:

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

Below is the code snippet for this SCENARIO:

Below is the code snippet for this scenario:

Below is the sample CODE snippet for this SCENARIO –

$("TR:even").CSS('color','green')

$("tr:odd").css('color','blue')

Below is the sample code snippet for this scenario –

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

$("tr:odd").css('color','blue')

If we want to GET the 4th &LT;li&GT; from the list of elements in <ul> then we can WRITE code as below –

$("ul li:eq(3)") // INDEX will start from 0.

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

$("ul li:eq(3)") // Index will start from 0.

We can select all &LT;span> elements USING below CODE –

$("span:contains('a4academics’')")

We can select all <span> elements using below code –

$("span:contains('a4academics’')")

Below is the SAMPLE CODE for SHOWING how we can do it –

$(".MyClass1.MyClass2").CSS('color','green');

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

$(".MyClass1.MyClass2").css('color','green');

Jquery Dialog is USED like a POP up and if Jquery used in MVC then we can render the cshtml contents in Jquery Dialog and its used like a CONFIRM BOX (as JAVASCRIPT) too.

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

“unbind” METHOD is used to remove the EVENT handlers associated to the element. This method can be used with SELECTORS to remove the event handlers of the selected elements.

“unbind” method is used to remove the event handlers associated to the element. This method can be used with selectors to remove the event handlers of the selected elements.

customerObj=new Object();

customerObj.name="A4Academics";

customerObj.Designation=”IT”;

$("#myControlID").CLICK(function(){

$("span").text($.param(customerObj));

});

Now the span ELEMENT will have VALUE like - “name=A4Academics&AMP;Designation=IT”

customerObj=new Object();

customerObj.name="A4Academics";

customerObj.Designation=”IT”;

$("#myControlID").click(function(){

$("span").text($.param(customerObj));

});

Now the span element will have value like - “name=A4Academics&Designation=IT”

“PARAM” METHOD is used for object or array in the MANNER of SERIALIZATION. While making AJAX CALLS, param method can be used to serialize the querystrings.

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

This method is used to GIVE the animation effects to the elements in Jquery. SlideToggle method uses following parameters:

• Speed – This is an optional PARAMETER and it specifies the speed of animation effect.
• EASING - This is an optional parameter and this specifies the speed of animation effect at DIFFERENT interval of time.
• Callback – This parameter is optional and it accepts the callback function which will be executed once the execution of “slideToggle” method is completed.

This method is used to give the animation effects to the elements in Jquery. SlideToggle method uses following parameters:

Both methods are used to change the widths of the elements.

For EXAMPLE:

$(‘#myControlID’).css(‘WIDTH’,’150px’);

$(‘#myControlID’).width(150);

Above is the code to change the width of the element to 150px. As you can SEE “css(width)” method takes the width in pixels whereas for “width” method no NEED to EXPLICITLY mention the width in pixels.

Both methods are used to change the widths of the elements.

For example:

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

$(‘#myControlID’).width(150);

Above is the code to change the width of the element to 150px. As you can see “css(width)” method takes the width in pixels whereas for “width” method no need to explicitly mention the width in pixels.

When we need to GET the list of SIBLING elements then “sibling” method is used on parent element. Selectors can be used to filter the siblings. For example

<UL>

<li> itemA </li>

<li id=”mycontrolID”> itemB </li>

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

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

</ul>

$(‘li#mycontrolID’).siblings().css(‘color’,’YELLOW’);

When we need to get the list of sibling elements then “sibling” method is used on parent element. Selectors can be used to filter the siblings. For example

<ul>

<li> itemA </li>

<li id=”mycontrolID”> itemB </li>

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

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

</ul>

$(‘li#mycontrolID’).siblings().css(‘color’,’yellow’);

$('#myControlID').ATTR('checked', TRUE);

$('#myControlID').attr('checked', FALSE);

$('#myControlID').attr('checked', true);

$('#myControlID').attr('checked', false);

$('#myControlID').ATTR('disabled', TRUE);

$('#myControlID').attr('disabled', FALSE);

$('#myControlID').attr('disabled', true);

$('#myControlID').attr('disabled', false);

Below is the sample 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 value –

$("#myControlID option:selected").text();

Below is the sample 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 value –

$("#myControlID option:selected").text();

“Resize” METHOD USED with window object. This method will be fired when the size of the browser window CHANGES. For example

$( window ).resize(function() {

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

});

As per above snippet when browser window’s size changes, content will be appended to the control – “myControlID”.

“Resize” method used with window object. This method will be fired when the size of the browser window changes. For example

$( window ).resize(function() {

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

});

As per above snippet when browser window’s size changes, content will be appended to the control – “myControlID”.

Below is the code SNIPPET which is used to sort the STRING array –

$(document).ready(function(){

var a4acarray = [ “Apple”,”ORANGE”,”BANANA”];

sortedarray = a4acarray.sort();

$(“#mycontrolID”).HTML(sortedarray.join(“”));

});

Below is the code snippet which is used to sort the string array –

$(document).ready(function(){

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

sortedarray = a4acarray.sort();

$(“#mycontrolID”).html(sortedarray.join(“”));

});

Yes. We can DEBUG Jquery FILE by USING “debugger” keyword. We can ADD the “debugger” keyword to the line of Jquery file where we have to debug.

Yes. We can debug Jquery file by using “debugger” keyword. We can add the “debugger” keyword to the line of Jquery file where we have to debug.

Below are the list of 4 parameters which are used in AJAX CALLS –

• TYPE
• CACHE
• DATA
• URL

Below are the list of 4 parameters which are used in AJAX calls –

“finish” METHOD is USED to stop the animations of the ELEMENTS and bring the elements to its FINAL state.

“finish” method is used to stop the animations of the elements and bring the elements to its final state.

Below is the SAMPLE code to explain:

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

In the above code SNIPPET variable – “Mypropertiescollection” will have ARRAY like below –

{

height: "100PX",

width: "200px", 

backgroundColor: "#FF01EF"

}

Below is the sample code to explain:

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

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

{

height: "100px",

width: "200px", 

backgroundColor: "#FF01EF"

}

YES. Jquery SUPPORTS AJAX.

Below are some of the METHODS of AJAX:

• Get()
• POST()
• GetJSON()
• Ajax()

Yes. Jquery supports AJAX.

Below are some of the methods of AJAX:

By using the property – “Jquery.BROWSER” we can WRITE the browser SPECIFIC CODE.

By using the property – “Jquery.Browser” we can write the browser specific code.

Caching is TEMPORARY MEMORY to store the data, which increases the performance of the application. So in JQUERY we can use the similar concept to store the data instead of repeating as shown below:

Old Code:

$('#MyControlID').addClass('test');

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

New Code for caching:

var $mycontrol = $("#MyControlID").css("color", "red");

//Do somre STUFFS here

$mycontrol.text("Error occurred!");

Caching is temporary memory to store the data, which increases the performance of the application. So in Jquery we can use the similar concept to store the data instead of repeating as shown below:

Old Code:

$('#MyControlID').addClass('test');

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

New Code for caching:

var $mycontrol = $("#MyControlID").css("color", "red");

//Do somre stuffs here

$mycontrol.text("Error occurred!");

Below is the sample code SNIPPET:

Old Code:

$(document).ready(function(){

$('#MyControlID').addClass('test');

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

$('#MyControlID').fadeIn('fast');

});

New Code after CHAINING:

$(document).ready(function(){

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

.css('color', 'yellow')

.fadeIn('fast'); 

});

Below is the sample code snippet:

Old Code:

$(document).ready(function(){

$('#MyControlID').addClass('test');

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

$('#MyControlID').fadeIn('fast');

});

New Code after chaining:

$(document).ready(function(){

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

.css('color', 'yellow')

.fadeIn('fast'); 

});

This is one of the powerful or robust feature of JQUERY. Chaining means connecting multiple EVENTS/ selectors/ functions. ADVANTAGE of this would be – code will be EASY to manage and good performance. Chain STARTS from left.

This is one of the powerful or robust feature of Jquery. Chaining means connecting multiple events/ selectors/ functions. Advantage of this would be – code will be easy to manage and good performance. Chain starts from left.

We can use METHOD – “holdReady” for this purpose. Below is the SAMPLE code SNIPPET –

$.holdReady(TRUE);

We can use method – “holdReady” for this purpose. Below is the sample code snippet –

$.holdReady(true);

Yes. We can INCLUDE different VERSIONS of JQUERY in same page.

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

• ATTR() – This method is USED to get the VALUE of attribute of first element.
• PROP() – This method is used to get the value of first element property.

By Default “clone” method does not clone the EVENTS unless it is being INSTRUCTED to copy. When “clone” method is being instructed to clone the events also then along with elements, events are also being COPIED. “Clone”method takes a Boolean PARAMETER, PASS true in clone method to copy the events like below -

$('#mycontrolid').clone(true).appendTo('body');

By Default “clone” method does not clone the events unless it is being instructed to copy. When “clone” method is being instructed to clone the events also then along with elements, events are also being copied. “Clone”method takes a Boolean parameter, pass true in clone method to copy the events like below -

$('#mycontrolid').clone(true).appendTo('body');

“Clone” method is used to clone the set of CONTROLS, which basically MEANS to copy the set of ELEMENTS which are matched on selectors. It copies the DESCENDANT elements along with the parent element.

For example:

$(document).ready(function(){

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

$('#mycontrolid').clone().appendTo('body');

return false;

});

});

“Clone” method is used to clone the set of controls, which basically means to copy the set of elements which are matched on selectors. It copies the descendant elements along with the parent element.

For example:

$(document).ready(function(){

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

$('#mycontrolid').clone().appendTo('body');

return false;

});

});

We can USE the property – “fx.off” to DISABLE the JQUERY animation. Set the property value to TRUE then it will disable the animation in Jquery.

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

In Jquery, we have to USE the METHOD CALLED – “STOP()” to stop the ANIMATION.

In Jquery, we have to use the method called – “stop()” to stop the animation.

“Animate” method is used for animation in JQUERY. This method is used to change the ELEMENT look and feel and give extra EFFECTS to the ELEMENTS.

For example:

$("#MyControlID").animate({height:"45px"});

“Animate” method is used for animation in Jquery. This method is used to change the element look and feel and give extra effects to the elements.

For example:

$("#MyControlID").animate({height:"45px"});

In MVC we can USE these Jquery Plugins in the form of rules LIKE below -

$('#MyControlId').rules("ADD", {

required: TRUE

});

In MVC we can use these Jquery Plugins in the form of rules like below -

$('#MyControlId').rules("add", {

required: true

});

“data” METHOD is used to ATTACH the data to the ELEMENTS in DOM. When the element is removed data also will be removed.

For example:

jQuery.data( document.body, "a4academics", 40 );

“data” method is used to attach the data to the elements in DOM. When the element is removed data also will be removed.

For example:

jQuery.data( document.body, "a4academics", 40 );

“Childrens” method is used to find the child controls of the element but its limited to only ONE level where as “find” method can be used to find the controls in any level in DOM TREE.

“Childrens” method is used to find the child controls of the element but its limited to only one level where as “find” method can be used to find the controls in any level in DOM tree.

Below are some of the METHODS USED:

• TOGGLE()
• FadeIn()
• FadeOut()
• HIDE()
• SHOW()

Below are some of the methods used:

It MEANS SELECT all the div elements with CLASS – “PARENT”.

It means select all the div elements with class – “parent”.