Sunday, September 27, 2015

What is jQuery

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What is jQuery
jQuery is a lightweight JavaScript library that simplifies programming with JavaScript. 

According to
jQuery is a fast, small, and feature-rich JavaScript library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers. With a combination of versatility and extensibility, jQuery has changed the way that millions of people write JavaScript.

Why should we use jQuery 
Advantages of using jQuery over raw JavaScript

The use of JQuery has several benefits over using the raw javascript.
1. jQuery is cross-browser
2. jQuery is a lot more easy to use than raw javascript
3. jQuery is extensible
4. jQuery simplifies and has rich AJAX support
5. jQuery has large development community and many plugins. Example autocomplete textbox plugin.
6. Excellent documentation

How to use jQuery in a web application
Download the jQuery file from and reference it in your application just like any other JavaScript file.

What is the difference between jQuery 1.x and 2.x
If you want to support IE6/7/8, then use jQuery 1.x where as if you don't have the need to support IE6/7/8 then use jQuery 2.x. jQuery 2.x is smaller in size than jQuery 1.x.

Example : Adding a click event handler for a button control using raw JavaScript. addEventListener() method is not supported in IE < 9.

<script type="text/javascript">

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