JQuery Programmer Questions And Answers

41⟩ Explain what does dollar sign ($) means in jQuery?

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(){

});

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42⟩ Explain width() vs css('width')?

1. In jQuery, there are two way to change the width of an element.

2. One way is using .css('width') and other way is using .width().

For example

$('#mydiv').css('width','300px');

$('#mydiv').width(100);

1. The difference in .css('width') and .width() is the data type of value we specify or return from the both functions.

2. In .css('width') we have to add "px" in the width value while in .width() we don't have to add.

3. When you want to get the width of "mydiv" element then .css('width') will return '300px' while .width() will return only integer value 300.

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43⟩ What is the basic need to start with jQuery?

To start with jQuery, one need to make reference of it's library. The latest version of jQuery can be downloaded from jQuery.com.

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44⟩ Explain bind() vs live() vs delegate() methods?

► The bind() method will not attach events to those elements which are added after DOM is loaded while live() and delegate() methods attach events to the future elements also.

The difference between live() and delegate() methods is live() function will not work in chaining. It will work only on an selector or an element while delegate() method can work in chaining.

For example

$(document).ready(function()

{

$("#myTable").find("tr").live("click",function()

{

alert($(this).text());

});

Above code will not work using live() method. But using delegate() method we can accomplish this.

$(document).ready(function()

{

$("#dvContainer")children("table").delegate("tr","click",function()

{

alert($(this).text());

});

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45⟩ How to set the value of an element using jQuery?

The val(val) method sets the value attribute of every matched element if it is called on <input> but if it is called on <select> with the passed <option> value then passed option would be selected, if it is called on check box or radio box then all the matching check box and radiobox would be checked.

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46⟩ How to bind a handler to one or more events (like click) for an element using jQuery?

The bind( type, [data], fn ) function binds a handler to one or more events (like click) for each matched element. Can also bind custom events.

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47⟩ Which built-in method returns the length of the string?

length() method returns the length of the string.

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48⟩ What are all the ways to include jQuery in a page?

Following are the ways to include jQuery in a page:

► Local copy inside script tag

► Remote copy of jQuery.com

► Remote copy of Ajax API

► Local copy of script manager control

► Embedded script using client script object

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49⟩ How to removes elements matching the specified selector from the set of matched elements using jQuery?

The not(selector) method removes elements matching the specified selector from the set of matched elements.

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50⟩ How to set the text contents of an element using jQuery?

The text( val ) sets the text contents of all matched elements.

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51⟩ How can we include jQuery library in ASP.Net project?

Download the jQuery library from jQuery.com and include that reference in the asp.net page.

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52⟩ Which operating system is more compatible with jQuery?

Mac, Windows and Linux are more compatible with the jQuery.

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53⟩ What is the use jQuery.data method?

jQuery.data methods is used to associate the data with the DOM nodes and the objects. This data method makes the jQuery code clear and concise.

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54⟩ How to get the html contents (innerHTML) of an element using jQuery?

The html() method gets the html contents (innerHTML) of the first matched element.

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55⟩ How to get the current offset of the first matched element, in pixels, relative to the document using jQuery?

The offset( ) method gets the current offset of the first matched element, in pixels, relative to the document.

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56⟩ How to find all sibling elements in front of the current element using jQuery?

The prevAll( [selector] ) method finds all sibling elements in front of the current element.

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57⟩ What are the two types of CDNs?

There are two types of CDNs:

► Microsoft - Load jQuery from Ajax CDN

► Google - Load jQuery from Google libraries API

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58⟩ Which built-in method sorts the elements of an array?

sort() method sorts the elements of an array.

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59⟩ Which built-in method returns the character at the specified index?

charAt() method returns the character at the specified index.

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60⟩ How to add the specified class if it is not present, remove the specified class if it is present using jQuery?

The toggleClass(class) method adds the specified class if it is not present, removes the specified class if it is present.

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JQuery Programmer

Home Client Side Scripting JQuery Programmer

154 JQuery Programmer Questions And Answers

41⟩ Explain what does dollar sign ($) means in jQuery?

42⟩ Explain width() vs css('width')?

43⟩ What is the basic need to start with jQuery?

44⟩ Explain bind() vs live() vs delegate() methods?

45⟩ How to set the value of an element using jQuery?

46⟩ How to bind a handler to one or more events (like click) for an element using jQuery?

47⟩ Which built-in method returns the length of the string?

48⟩ What are all the ways to include jQuery in a page?

49⟩ How to removes elements matching the specified selector from the set of matched elements using jQuery?

50⟩ How to set the text contents of an element using jQuery?

51⟩ How can we include jQuery library in ASP.Net project?

52⟩ Which operating system is more compatible with jQuery?

53⟩ What is the use jQuery.data method?

54⟩ How to get the html contents (innerHTML) of an element using jQuery?

55⟩ How to get the current offset of the first matched element, in pixels, relative to the document using jQuery?

56⟩ How to find all sibling elements in front of the current element using jQuery?

57⟩ What are the two types of CDNs?

58⟩ Which built-in method sorts the elements of an array?

59⟩ Which built-in method returns the character at the specified index?

60⟩ How to add the specified class if it is not present, remove the specified class if it is present using jQuery?

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JQuery Programmer

Home Client Side Scripting JQuery Programmer

154 JQuery Programmer Questions And Answers

41⟩ Explain what does dollar sign ($) means in jQuery?

42⟩ Explain width() vs css('width')?

43⟩ What is the basic need to start with jQuery?

44⟩ Explain bind() vs live() vs delegate() methods?

45⟩ How to set the value of an element using jQuery?

46⟩ How to bind a handler to one or more events (like click) for an element using jQuery?

47⟩ Which built-in method returns the length of the string?

48⟩ What are all the ways to include jQuery in a page?

49⟩ How to removes elements matching the specified selector from the set of matched elements using jQuery?

50⟩ How to set the text contents of an element using jQuery?

51⟩ How can we include jQuery library in ASP.Net project?

52⟩ Which operating system is more compatible with jQuery?

53⟩ What is the use jQuery.data method?

54⟩ How to get the html contents (innerHTML) of an element using jQuery?

55⟩ How to get the current offset of the first matched element, in pixels, relative to the document using jQuery?

56⟩ How to find all sibling elements in front of the current element using jQuery?

57⟩ What are the two types of CDNs?

58⟩ Which built-in method sorts the elements of an array?

59⟩ Which built-in method returns the character at the specified index?

60⟩ How to add the specified class if it is not present, remove the specified class if it is present using jQuery?

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