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What is jQuery?

Posted By :volvo     Posted Date :December 01, 2013    Points :40   Category :JQuery 
jQuery is fast, lightweight and feature-rich client side JavaScript Library/Framework which helps in to traverse HTML DOM, make animations, add Ajax interaction, manipulate the page content, change the style and provide cool UI effect. It is one of the most popular client side library and as per a survey it runs on every second website.

You can also find related Interview Question to What is jQuery?  below: 

What is JQuery?

JQuery is Java Script library or Java Script Framework which helps in how to traverse HTML documents, do some cool animations, and add Ajax interaction to any web page. It mainly helps programmer to reduce lines of code as huge code written in Java Script, can be done easily with JQuery in few lines. (More...)

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



Over here $ sign can be replaced with "jQuery " keyword.


}); (More...)

How is body onload() function is different from document.ready() function used in jQuery?

Document.ready() function is different from body onload() function because off 2 reasons.

1. We can have more than one document.ready() function in a page where we can have only one onload function.
2. Document.ready() function is called as soon as DOM is loaded where body.onload() function is called when everything gets loaded on the page that includes DOM, images and all associated resources of the page. (More...)

What are the steps you need to follow to use jQuery in ASP.Net project?

It's really simple. One just need to add reference of javascript file(.js). Go to Jquery.com and download the latest version of jQuery. When download is completed, there is a "jQuery-1.3.2.js" in the folder. Include this file

and you good to go now for JQuery.

Note : 1.3.2 denotes the library version.. It can be vary depending upon the version of Jquery you download. (More...)

There are 3 types of selectors in Jquery?

1. CSS Selector
2. XPath Selector
3. Custom Selector (More...)

Name some of the methods of JQuery used to provide effects?

1. Show()
2. Hide()
3. Toggle()
4. FadeIn()
5. FadeOut() (More...)

What is the basic used of jQuery() function

->Establish code to be executed when the DOM is ready for manipulation.
->Help as a namespace for global utility functions.
->Create DOM elements from HTML markup.
->Select and wrap DOM elements to operate upon (More...)

which are basic selectors in jQuery (cross browser)?

->Element ID's
->CSS class name
->Tag name
->last but not the least DOM hierarchy. (More...)

What does hash and dot sign means in JQuery?

both hash and dot used to identify the control available in the page.

hash # is used to identify the control by control id.

Dot . is used to get the control by its class name.

for eg

To use this control in JQuery we should use $('.dvclass')

To use this control in JQuery we should use $('#dvclass') (More...)

Why do we use jQuery?

JQuery is used due to following advantages:-

Easy to use and learn.
Easily expandable.
Cross-browser support (IE 6.0+, FF 1.5+, Safari 2.0+, Opera 9.0+)
Easy to use for DOM manipulation and traversal.
Large pool of built in methods.
AJAX Capabilities.
Methods for changing or applying CSS, creating animations.
Event detection and handling.
Tons of plug-ins for all kind of needs. (More...)

Difference between JavaScript and jQuery?

JavaScript is a language While jQuery is a library built in the JavaScript language that helps to use the JavaScript language. (More...)

Which is the starting point of code execution in jQuery?

The starting point of jQuery code execution is $(document).ready() function which is executed when DOM is loaded. (More...)

What is the difference between jquery.js and jquery.min.js?

jquery.min.js is the minified version, where as jquery.js is the non-minified version. In your production website always use minified files as they download faster and consumes less bandwidth. (More...)

What is resize() function in jquery.

Resize() function is called whenever the browser size is changed. This event can be only used with $(window)


.resize([event_data], handler(event_object))

event_data is the data to be sent to the handler.
and handler(event_object) is a function to be called each time when the window is resized.

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