Reading documentation, blogs, and forums are useful ways to learn how to use jQuery, but there is ultimately no substitute for actually writing code. That’s why we’ve been collaborating with Code School to create Try jQuery, a brand new introductory course with video and interactive examples to make it easier to take those first steps.

Try jQuery walks you through the most fundamental building blocks of jQuery, from actually getting the library into your page to selecting, manipulating, and creating DOM elements, and reacting to user input. The entire experience takes place in the browser, so there’s live feedback on your code as you complete the exercises and learn the basics.

The course takes about three hours to complete, but you can take it all at your own pace. Best of all, Try jQuery is completely free! If you’d like to save your progress and earn badges, you can sign up with Code School.

We’re really glad to be able to provide new jQuery users with an easy way to get started. So if you’re looking to understand how to use jQuery — or know someone else who is — we hope Try jQuery helps get you in gear!

Should you encounter any trouble with the course, please contact Code School. If you’d like want to provide feedback on Try jQuery, you can get in touch with us at content at jquery dot com, and you can also reach out to Code School.

To magnify your jQuery migration pleasure, version 1.1.1 of the jQuery Migrate plugin is now available. This plugin can greatly simplify the process of moving older jQuery code to version 1.9.0 or higher of jQuery by identifying deprecated features. It can also restore those features so that older code can run without needing any changes at all. We strongly recommend that you use this plugin in your initial jQuery 1.9 upgrade — make it easy on yourself, that’s why we wrote this plugin!

If you haven’t yet read about jQuery 1.9 and the Migrate plugin, we recommend that you check out the jQuery 1.9 upgrade guide and the original jQuery 1.9 blog post.

Using the plugin is easy; just include it immediately after the script tag for jQuery, for example.

<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script src="http://code.jquery.com/jquery-migrate-1.1.1.js"></script>

For more information, see the jQuery Migrate documentation.

Here are the items we’ve polished for this version; you can see the complete list at Github. Many thanks to jQuery team member Richard Gibson for his help on this release.

• Remove “use strict”: Not all code is compatible with JavaScript’s “use strict” mode, so we’ve removed this restriction for the same reason we did in jQuery 1.9.1. This fixes some issues with diagnostic software that uses arguments.caller and with form processing in ASP.NET.
• $.parseJSON in $.ajax: In 1.9 when an $.ajax() call specifies a dataType: "json" the returned value MUST be valid JSON. Older versions treated an empty string as a success even though it was not valid JSON. The Migrate plugin will now warn about this, treat the result as success and return null as older versions did.
• Preserve custom $.browser: If the $.browser object has been changed or augmented by code that loaded before jQuery Migrate, those changes will now be preserved. However, we still advise the Migrate plugin be loaded immediately after the jQuery core file.

Happy upgrading!

The jQuery team is pleased to announced that jQuery 1.9.1 is available! This release addresses the bugs and regressions that have been reported during the past few weeks. Whether you’re using 1.9.0 or using an older version, these are the droids you’re looking for.

Please, please, please, use the jQuery Migrate plugin and look at the upgrade guide if you’re just starting your upgrade to jQuery 1.9. The plugin will quickly find and fix any compatibility issues, just look in the browser console. Once you fix the warnings you can remove it. Or, leave the plugin in place until you have the chance to fix your code and plugins to make them 1.9-compatible.

<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script src="http://code.jquery.com/jquery-migrate-1.1.0.js"></script>


We’ve sent the files to the Google and Microsoft folks, so you should see them up on their CDNs shortly.

Many thanks to those of you who reported bugs, and to the following people who contributed patches to the 1.9.1 release: Adam Coulombe, Andrew Plummer, Corey Frang, Danil Somsikov, Jean Boussier, Julian Aubourg, Mike Sherov, Oleg Gaidarenko, Richard Gibson, Ryunosuke Sato, and Timmy Willison.

Gold-leaf-cluster thanks to Paul Irish, who mobilized special forces to find a solution for 13274!

Change Log

Ajax

• #13276: In IE 9/10 $.parseXML() returning document object instead of XMLDOMDocument
• #13292: $.ajax with 1.9.0 doesn’t call anymore success function in case of 204
• #13306: File input added to serialized forms caused a change in behavior and only halfway follows spec

Build

• #12656: Make event shorthands an excludable module
• #13274: IE < 9: “‘jquery’ is undefined” w/ sourceMappingURL comment
• #13316: Check against jquery.min.js with TestSwarm
• #13335: “use strict”; break asp.net ajax postacks in FF

Deferred

• #13150: Be able to determine if $.Callback() has functions

Effects

• #12846: overflow:hidden is not removed when .stop() is called
• #13183: Wrong animation initial value calculation (1.9.0rc1)

Event

• #13208: JS error trying to get the id of the document in IE8
• #13360: Creating String.prototype.namespace can cause an exception in jQuery.Event

Manipulation

• #13282: QtWebKit — TypeError: ‘[object Object]’ is not a valid argument for ‘Function.prototype.apply’ (evaluating ‘elem.nodeType’)
• #13315: minified manipulation methods fail on oldIE with XML
• #13233: Unexpected behavior when iterating over and manipulating detached nodes in jquery 1.9

Selector

• #13182: nested has selectors broken in IE7 & IE8 in versions 1.8.2+
• #13281: Wrong order when using .find() in IE7/8
• #13331: jQuery.fn.add returns incorrect order in Chrome and Safari

Support

• #13089: support adds zoom style to body in Chrome/Safari

Traversing

• #13349: find function slower since 1.9.0, especially in chrome