JQuery Programmer Questions And Answers

121⟩ What are jQuery Selectors? Give some examples?

1. jQuery Selectors are used to select one or a group of HTML elements from your web page.

2. jQuery support all the CSS selectors as well as many additional custom selectors.

3. jQuery selectors always start with dollar sign and parentheses: $().

4. There are three building blocks to select the elements in a web document.

1) Select elements by tag name

Example : $(div)

It will select all the div elements in the document.

2) Select elements by ID

Example : $("#xyzid")

It will select single element that has an ID of xyzid.

3) Select elements by class

Example : $(".xyzclass")

It will select all the elements having class xyzclass.

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122⟩ How to get the inner height (excluding the border) of an element using jQuery?

The innerHeight( ) method gets the inner height (excludes the border and includes the padding) for the first matched element.

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123⟩ How to get a set of elements containing the closest parent element that matches the specified selector, the starting element included using jQuery?

The closest( selector ) method gets a set of elements containing the closest parent element that matches the specified selector, the starting element included.

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124⟩ What is callback?

A callback is a plain JavaScript function passed to some method as an argument or option. Some callbacks are just events, called to give the user a chance to react when a certain state is triggered.

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125⟩ How can you create an Object in JavaScript?

JavaScript supports Object concept very well. You can create an object using the object literal as follows −

var emp = {

name: "Jhon",

age: 10

};

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126⟩ How to select a subset of the matched elements using jQuery?

The slice(selector) method selects a subset of the matched elements.

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127⟩ What is closure?

Closures are created whenever a variable that is defined outside the current scope is accessed from within some inner scope.

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128⟩ How to know if a specified class is present on at least one of the set of matched elements using jQuery?

The hasClass( class ) method returns true if the specified class is present on at least one of the set of matched elements.

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129⟩ What is the method used to define the specific character in place of $ sign?

'NoConflict' method is used to reference a jQuery and save it in a variable. That variable can be used instead of Sign.

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130⟩ Is jQuery replacement of Java Script?

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.

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131⟩ Whether jQuery HTML work for both HTML and XML documents?

No, jQuery HTML only works for HTML documents not for XML Documents.

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132⟩ How to get the height of an element using jQuery?

The height( ) method gets the current computed, pixel, height of the first matched element.

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133⟩ Is jQuery a library for client scripting or server scripting?

Client side scripting.

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134⟩ What is the difference between jquery.size() and jquery.length?

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.

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135⟩ How to prevents the browser from executing the default action using jQuery?

The preventDefault() method of Event object prevents the browser from executing the default action.

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136⟩ How does jquery store data related to an element?

In plain java scripts the information about an element can be stored by adding a domain object model property to the element. This results in memory leak problems in certain browsers. In jquery the user does not has to worry about memory management issues.

For ex : Storing and retrieving data related to an element:

$('#myDiv').data('keyName', { foo : 'bar' });

$('#myDiv').data('keyName'); // { foo : 'bar' }

Jquery allows the user to store any kind of information on an element. The $.fn.data is used the most to store data related to an element.

For ex : Storing of relationship between elements with the use of $.fn.data :

$('#myList li').each(function()

{

var $li = $(this), $div = $li.find('div.content');

$li.data('contentDiv', $div);

});

// later, the user is not required to look for the div again;

// the data can simply be read from the list items data;

var $firstLi = $('#myList li:first');

$firstLi.data('contentDiv').html('new content');

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137⟩ Explain the common methods of sending a request to a server?

The two most common methods of sending a request to a server are :

1. GET method : The get method is mostly used for non destructive operations. These operations get data from the server and does not change the data on it. A good example of the application of the search query to a server. In most of the cases GET will send all of the data to be sent in the form of a query string.

2. POST method : The POST method is primarily used for destructive operations. These operations can change the data on a server. A good example is a user saving an entry on a site will get the POST request. These requests are not cached by the browser. A query can be a part of a url but any data that is to be sent is done separately as post data.

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138⟩ How to add the previous selection to the current selection using jQuery?

The andSelf( ) method adds the previous selection to the current selection.

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139⟩ How to get the direct parent of an element using jQuery?

The parent( [selector] ) method gets the direct parent of an element. If called on a set of elements, parent returns a set of their unique direct parent elements.

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140⟩ Is it possible to get value of multiple CSS properties in single statement?

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"

}

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JQuery Programmer

Home Client Side Scripting JQuery Programmer

154 JQuery Programmer Questions And Answers

121⟩ What are jQuery Selectors? Give some examples?

122⟩ How to get the inner height (excluding the border) of an element using jQuery?

123⟩ How to get a set of elements containing the closest parent element that matches the specified selector, the starting element included using jQuery?

124⟩ What is callback?

125⟩ How can you create an Object in JavaScript?

126⟩ How to select a subset of the matched elements using jQuery?

127⟩ What is closure?

128⟩ How to know if a specified class is present on at least one of the set of matched elements using jQuery?

129⟩ What is the method used to define the specific character in place of $ sign?

130⟩ Is jQuery replacement of Java Script?

131⟩ Whether jQuery HTML work for both HTML and XML documents?

132⟩ How to get the height of an element using jQuery?

133⟩ Is jQuery a library for client scripting or server scripting?

134⟩ What is the difference between jquery.size() and jquery.length?

135⟩ How to prevents the browser from executing the default action using jQuery?

136⟩ How does jquery store data related to an element?

137⟩ Explain the common methods of sending a request to a server?

138⟩ How to add the previous selection to the current selection using jQuery?

139⟩ How to get the direct parent of an element using jQuery?

140⟩ Is it possible to get value of multiple CSS properties in single statement?

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JQuery Programmer

Home Client Side Scripting JQuery Programmer

154 JQuery Programmer Questions And Answers

121⟩ What are jQuery Selectors? Give some examples?

122⟩ How to get the inner height (excluding the border) of an element using jQuery?

123⟩ How to get a set of elements containing the closest parent element that matches the specified selector, the starting element included using jQuery?

124⟩ What is callback?

125⟩ How can you create an Object in JavaScript?

126⟩ How to select a subset of the matched elements using jQuery?

127⟩ What is closure?

128⟩ How to know if a specified class is present on at least one of the set of matched elements using jQuery?

129⟩ What is the method used to define the specific character in place of $ sign?

130⟩ Is jQuery replacement of Java Script?

131⟩ Whether jQuery HTML work for both HTML and XML documents?

132⟩ How to get the height of an element using jQuery?

133⟩ Is jQuery a library for client scripting or server scripting?

134⟩ What is the difference between jquery.size() and jquery.length?

135⟩ How to prevents the browser from executing the default action using jQuery?

136⟩ How does jquery store data related to an element?

137⟩ Explain the common methods of sending a request to a server?

138⟩ How to add the previous selection to the current selection using jQuery?

139⟩ How to get the direct parent of an element using jQuery?

140⟩ Is it possible to get value of multiple CSS properties in single statement?

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