| Original author(s) | John Resig |
|---|---|
| Developer(s) | jQuery Team |
| Initial release | August 26, 2006 |
| Stable release | 1.4.2 / February 19, 2010 |
| Development status | Active |
| Written in | JavaScript |
| Size | 24KB zipped (production mode) / 155KB (development mode) |
| Type | Web application framework |
| License | Dual license: GPL or MIT |
| Website | http://jquery.com/ |
jQuery is a cross-browser JavaScript library designed to simplify the client-side scripting of HTML.[1] It was released in January 2006 at BarCamp NYC by John Resig. Used by over 31% of the 10,000 most visited websites, jQuery is the most popular JavaScript library in use today.[2][3]
jQuery is free, open source software, dual-licensed under the MIT License and the GNU General Public License, Version 2.[4] 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 plugins on top of the JavaScript library. Using these facilities, developers are able to create abstractions for low-level interaction and animation, advanced effects and high-level, theme-able widgets. This contributes to the creation of powerful and dynamic web pages.
Microsoft and Nokia have announced plans to bundle jQuery on their platforms,[5] Microsoft adopting it initially within Visual Studio[6] 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.[7] JQuery is also implemented in MediaWiki since version 1.16.[8]
Contents |
jQuery contains the following features:
each function.The jQuery library is usually a single JavaScript file, containing all its common DOM, event, effects, and Ajax functions. It can be included within a web page using the following mark-up:
<script type="text/javascript" src="jQuery.js"></script>
jQuery can also be loaded using the Google AJAX Libraries API with the following mark-up[10]:
<script type="text/javascript" src="http://www.google.com/jsapi"></script> <script> google.load("jquery", "1.4.2"); </script>
or (HTTPS and HTTP):
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
Microsoft hosts jQuery on its AJAX CDN (Content delivery network) making it easy to add the support for jQuery library. CDN serves JavaScript libraries from one of thousands of geo-located Microsoft edge-cache servers around the world.
<script src="http://ajax.microsoft.com/ajax/jquery/jquery-1.4.2.min.js" type="text/javascript"></script>
jQuery has two usage styles:
$ function, which is a factory method for the jQuery object. These functions, often called commands, are chainable; they each return a jQuery object$.-prefixed functions. These are utility functions which do not work on the jQuery object per se.Typically, access to and manipulation of multiple DOM nodes begins with the $ function being called with a CSS selector string, which results in a jQuery object referencing matching elements in the HTML page. This node set can be manipulated by calling instance methods on the jQuery object, or on the nodes themselves. For example:
$("div.test").add("p.quote").addClass("blue").slideDown("slow");
This line finds the union of all div tags with class attribute test and all p tags with CSS class attribute quote, adds the class attribute blue to each matched element, and then slides them down with an animation. The $ and add functions affect the matched set, while the addClass and slideDown affect the referenced nodes.
The methods prefixed with $. are convenience methods or affect global properties and behaviour. For example, the following is an example of the map function called each in jQuery:
$.each([1,2,3], function() { document.write(this + 1); });
This writes the number 234 to the document.
It is possible to perform browser-independent Ajax queries using $.ajax and associated methods to load and manipulate remote data.
$.ajax({ type: "POST", url: "some.php", data: "name=John&location=Boston", success: function(msg){ alert( "Data Saved: " + msg ); } });
This example posts the data name=John and location=Boston to some.php on the server. When this request finishes successfully, the success function is called to alert the user.
Because of jQuery's architecture, other developers can use its constructs to create plug-in code to extend its functionality. Currently there are thousands of jQuery plug-ins available on the web[11] that cover a wide range of functionality such as Ajax helpers, webservices, datagrids, dynamic lists, XML and XSLT tools, drag and drop, events, cookie handling, modal windows, even a jQuery-based Commodore 64 emulator![12]
An important source of jQuery plug-ins is the the Plugins sub-domain of the jQuery Project website.[11] There are alternative plug-in search engines[13] that take more specialist approaches, such as only listing plug-ins that meet certain criteria (e.g. those that have a public code repository). The tutorials page on the jQuery site has a list of links to jQuery plug-in tutorials under the "Plugin development" section.[14]
| Release date | Version number | Additional notes |
|---|---|---|
| August 26, 2006 | 1.0 | First Stable Release |
| August 31, 2006 | 1.0.1 | |
| October 9, 2006 | 1.0.2 | |
| October 27, 2006 | 1.0.3 | |
| December 12, 2006 | 1.0.4 | Last 1.0 bug fix |
| January 14, 2007 | 1.1 | |
| January 22, 2007 | 1.1.1 | |
| February 27, 2007 | 1.1.2 | |
| July 1, 2007 | 1.1.3 | |
| July 5, 2007 | 1.1.3.1 | |
| August 24, 2007 | 1.1.4 | |
| September 10, 2007 | 1.2 | |
| September 16, 2007 | 1.2.1 | |
| January 15, 2008 | 1.2.2 | |
| February 8, 2008 | 1.2.3 | |
| May 19, 2008 | 1.2.4 | |
| May 21, 2008 | 1.2.5 | Fix for bad build of 1.2.4 |
| May 24, 2008 | 1.2.6 | |
| January 14, 2009 | 1.3 | Sizzle Selector Engine introduced into core |
| January 21, 2009 | 1.3.1 | |
| February 20, 2009 | 1.3.2 | |
| January 14, 2010 | 1.4 | |
| January 25, 2010 | 1.4.1 | |
| February 19, 2010 | 1.4.2 |
|
|||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||