FAQ--(JQuary)

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1.    What is jQuery?

a.        JQuery is a lightweight JavaScript library which is used to interact with JavaScript and HTML.

b.      It improves the preformation of a web application.

Following is the list of important core features supported by jQuery −

2.    DOM manipulation − The jQuery made it easy to select DOM elements, traverse them and modifying their content by using cross-browser open source selector engine called Sizzle.

3.    Event handling − The jQuery offers an elegant way to capture a wide variety of events, such as a user clicking on a link, without the need to clutter the HTML code itself with event handlers.

4.    AJAX Support − The jQuery helps you a lot to develop a responsive and feature-rich site using AJAX technology.

5.    Animations − The jQuery comes with plenty of built-in animation effects which you can use in your websites.

6.    Lightweight − The jQuery is very lightweight library - about 19KB in size ( Minified and gzipped ).

7.    Cross Browser Support − The jQuery has cross-browser support, and works well in IE 6.0+, FF 2.0+, Safari 3.0+, Chrome and Opera 9.0+.

8.    Latest Technology − The jQuery supports CSS3 selectors and basic XPath syntax.

 

9.    What is $() in jQuery library?

a.    The $() function is an alias of jQuery () function.

10.  What is a CDN? What are advantage to use this CDN

a.     

There are two types of CDN:

o    Microsoft: It loads jQuery from AJAX CDN.

o    Google: It loads jQuery from Google libraries API.

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11.  How you can use a JQuery Library in your project.

a.    You can use a jQuery library in the ASP.Net project from downloading the latest jQuery library from jQuery.com and include the references to the jQuery library file in your HTML/PHP/JSP/Aspx page.

b.     

12.  What are the selector in JQuery? How many type of selector in JQuery?

If you want to work with an element on the web page, first you need to find it. Selectors find the HTML elements in jQuery. There are many types of selectors. Some basic selectors are:

• Name: It is used to select all elements which match with the given element Name.
• #ID: It is used to select a single element which matches with the given ID
• .Class: It is used to select all elements which match with the given Class.
• Universal (*): It is used to select all elements available in a DOM.
• Multiple Elements E, F, G: It is used to selects the combined results of all the specified selectors E, F or G.
• Attribute Selector: It is used to select elements based on its attribute value.

 

13.  What are the different type of selector in Jquery?

a.     

There are three types of selectors in jQuery:

o    CSS Selector

o    Custom Selector

o    XPath Selector

   

14.  What is use of serialize in JQuery?

a.     

The jQuery serialize() method is used to create a text string in standard URL-encoded notation. It serializes the form values so that its serialized values can be used in the URL query string while making an AJAX request.

15.  What is the different between prop and attr ?

a.     

attr(): It gets the value of an attribute for the first element in the set of matched element.

prop(): it gets the value of a property for the first element in the set of matched elements. It is introduced in jQuery 1.6.

 

16.  What  are effect method use in JQuery?

a.     

Answer: jQuery enables us to add effects on a web page. jQuery effects can be categorized into fading, sliding, hiding/showing, and animation effects. jQuery provides many methods for effects on a web page

These are the effects methods used in jQuery:

• show() - It displays or shows the selected elements.
• hide() - It hides the matched or selected elements.
• toggle() - It shows or hides the matched elements. In other words, it toggles between the hide() and shows () methods.
• fadeIn() - It shows the matched elements by fading it to opaque. In other words, it fades into the selected elements.
• fadeOut() - It shows the matched elements by fading it to transparent. In other words, it fades out the selected elements. 

 

17.  What are the feature of  JQuery?

a.     

Question: What are the features of jQuery?

Answer: Some important features of jQuery are:

·         Easy DOM manipulation using the Sizzle engine.

·         Event handling & AJAX support.

·         Built-in effects and animations.

·         Lightweight library.

·         Cross-browser compatibility.

·         Supports CSS3, basic XPath, HTML5.

Question: What are the features of jQuery?

Answer: Some important features of jQuery are:

·         Easy DOM manipulation using the Sizzle engine.

·         Event handling & AJAX support.

·         Built-in effects and animations.

·         Lightweight library.

·         Cross-browser compatibility.

·         Supports CSS3, basic XPath, and HTML5.

 

18.  What is JQuery AJAX?

a.     

Answer: AJAX is an acronym standing for Asynchronous JavaScript and XML, and this technology helps us load data and exchange data with the server without a browser page refresh. JQuery is a great tool that provides a rich set of AJAX methods to develop next-generation web applications.

This method sends an asynchronous HTTP request to the server.

19.  What is JQuery AJAX?

a.     

AJAX stands for “Asynchronous JavaScript and XML”. AJAX is about exchanging data with a server, without reloading the whole page. It is a technique for creating fast and dynamic web pages.

In .NET, we can call server side code using two ways:

1.    ASP .NET AJAX

2.    jQuery AJAX

In this article we will focus on jQuery Ajax.

$.ajax () Method

JQuery’s core method for creating Ajax requests. Here are some jQuery AJAX methods:

·         $.ajax() - Performs an async AJAX request.

·         $.get() - Loads data from a server using an AJAX HTTP GET request.

·         $.post() - Loads data from a server using an AJAX HTTP POST request.

To know more click.

$.ajax () Method Configuration option

Options that we use:

·         async

·         type

·         url

·         data

·         datatype

·         success

·         error

Let’s have a detailed overview:

async

Set to false if the request should be sent synchronously. Defaults to true.

 

20.  What is th use of Filter in  JQuery?

a.     

JQuery supports various types of filters, such as:

1.    .eq()

2.    .first()

3.    .last()

4.    .filter()

5.    .has()

6.    .not()

 

21.  What is use of JQuery.ajax() method ?

a.     

The ajax() method is used to do an AJAX (asynchronous HTTP) request. It provides more control of the data sending and on response data. It allows the handling of errors that occur during a call and the data if the call to the ajax page is successful.

Here is the list of some basic parameters required for jQuery.ajax Method: 

·         type: Specifies the type of request (GET or POST).

·         url: Specifies the URL to send the request to. The default is the current page.

·         contentType: The content type used when sending data to the server. The default is "application/x-www-form-urlencoded".

·         dataType: The data type expected of the server response.

·         data: Specifies data to be sent to the server.

·         success(result,status,xhr): A function to run when the request succeeds.

·         error(xhr,status,error): A function to run if the request fails.

 

22.  What is Attribute in JQuery ?

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There are many important properties of DOM or HTML elements such as for the <img> tag the src, class, id, title and other properties. jQuery provides ways to easily manipulate an elements attribute and gives us access to the element so that we can also change its properties. 

1.    attr( properties ) - Set a key/value object as properties to all matched elements.

2.    attr( key, fn ) - Set a single property to a computed value, on all matched elements.

3.    removeAttr( name ) - Remove an attribute from each of the matched elements.

4.    hasClass( class ) - Returns true if the specified class is present on at least one of the set of matched elements.

5.    removeClass( class ) - Removes all or the specified class(es) from the set of matched elements.

6.    toggleClass( class ) - Adds the specified class if it is not present, removes the specified class if it is present.

7.    html( ) - Gets the HTML contents (innerHTML) of the first matched element.

8.    html( val ) - Sets the HTML contents of every matched element.

9.    text( ) - Gets the combined text contents of all matched elements.

10. text( val ) - Sets the text contents of all matched elements.

11. val( ) - Gets the input value of the first matched element.

 

23.  What are the JQuery EVENTS ?

a.     bind(), unbind(), blur(), off(), hover(), on(), one(), ready(), trigger() etc. 

b.    When we design dynamic web pages, we need to apply some events such as Mouse Click, for forms submit the form after a button click, change a color after a click, etc. So in layman language, events are actions that are used for dynamic web pages. When we perform these actions on an HTML page, we can do whatever we want.

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