The Vision Spark


jQuery is a cross-platform JavaScript library designed to simplify the client-side scripting of HTML. It was released in January 2006 at BarCamp NYC by John Resig. It is currently developed by a team of developers led by Dave Methvin. Used by over 80% of the 10,000 most visited websites, jQuery is the most popular JavaScript library in use today. jQuery is free, open source software, licensed under the MIT License. jQuery’s syntax is designed to make it easier to navigate a document, select DOM elements, create animations, handle events, and develop Ajax applications. jQuery also provides capabilities for developers to create plug-ins on top of the JavaScript library. This enables developers to create abstractions for low-level interaction and animation, advanced effects and high-level, theme-able widgets. The modular approach to the jQuery library allows the creation of powerful dynamic web pages and web applications.
The set of jQuery core features — DOM element selections, traversal and manipulation — enabled by its selector engine (named “Sizzle” from v1.3), created a new “programming style”, fusing algorithms and DOM-data-structures; and influenced the architecture of other JavaScript frameworks like YUI v3 and Dojo.
Microsoft and Nokia bundle jQuery on their platforms. Microsoft includes it with Visual Studio[8] for use within Microsoft’s ASP.NET AJAX framework and ASP.NET MVC Framework while Nokia has integrated it into their Web Run-Time widget development platform.[9] jQuery has also been used in MediaWiki since version 1.16.
jQuery includes the following features:
•    DOM element selections using the multi-browser open source selector engine Sizzle, a spin-off of the jQuery project[11]
•    DOM traversal and modification (including support for CSS 1–3)
•    DOM manipulation based on CSS selectors that uses node elements name and node elements attributes (id and class) as criteria to build selectors
•    Events
•    Effects and animations
•    AJAX
•    JSON parsing
•    Extensibility through plug-ins
•    Utilities – such as user agent information, feature detection
•    Compatibility methods that are natively available in modern browsers but need fall backs for older ones – For example the inArray() and each() functions.
•    Multi-browser (not to be confused with cross-browser) support.
Both version 1.x and 2.x of jQuery support “current-1 versions” (meaning the current stable version of the browser and the version that preceded it) of Firefox, Google Chrome, Safari, and Opera. The version 1.x also supports Internet Explorer 6 or higher. However, jQuery version 2.x dropped Internet Explorer 6–8 support (which represents less than 28% of all browsers in use) and can run only with IE 9 or higher.

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.