jQuery Core: Version 1.9 and Beyond

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Please check out the followup post before jumping to the wrong conclusion.

As the last blog post discussed, jQuery version 1.8 is undergoing a spring cleaning to remove insecure, inefficient, ineffective, and inadvisable features. We’ve also begun the work to allow you to build custom versions that exclude parts of the library for even greater savings. Those efforts will make it possible for you to enjoy the jQuery API you need without carrying around the parts you don’t want.

Now that we’ve cleaned house, it’s time to take a look forward. There’s just one thing interfering with our vision of the future, and that’s the ghost of browsers past. Internet Explorer 6, 7, and 8–collectively, oldIE–have been a thorn in the side of web developers for a decade. Collectively, these browsers of a bygone era still represent up to one-third of users visiting some sites. That is a lot of users–people who still want the information, services and products that web sites provide. For many web sites that use jQuery, it’s not practical or profitable to ignore that audience.

jQuery was conceived specifically to address the differences in browsers, so we’re not going to abandon the essence of our philosophy and simply disregard the millions of active Internet users who (for whatever reasons) still use oldIE. Yet we also want to move ahead and take advantage of modern browsers, especially the growing mobile market.

The Road Ahead

jQuery 1.8 should arrive within a month. Here is our thinking about the next two versions of jQuery to follow it, and when they’ll arrive:

jQuery 1.9 (early 2013): We’ll remove many of the interfaces already deprecated in version 1.8; some of them will be available as plugins or alternative APIs supported by the jQuery project. IE 6/7/8 will be supported as today.

We’ll remove many of the interfaces already deprecated in version 1.8; some of them will be available as plugins or alternative APIs supported by the jQuery project. IE 6/7/8 will be supported as today. jQuery 1.9.x (ongoing in 2013 and beyond): This version will continue to get fixes for any regressions, new browser bugs, etc.

This version will continue to get fixes for any regressions, new browser bugs, etc. jQuery 2.0 (early 2013, not long after 1.9): This version will support the same APIs as jQuery 1.9 does, but removes support for IE 6/7/8 oddities such as borked event model, IE7 “attroperties”, HTML5 shims, etc.

Our goal is for 1.9 and 2.0 to be interchangeable as far as the API set they support. When 2.0 comes out, your decision on which version to choose should be as simple as this: If you need IE 6/7/8 support, choose 1.9; otherwise you can use either 1.9 or 2.0.

Questions and Answers

If jQuery 1.9 and 2.0 are basically the same API, what makes 2.0 compelling? Smaller size, better performance, and the lack of problems introduced by the need for oldIE support. We expect that we can improve error handling in the $.Deferred implementation in 2.0, for example, whereas we can’t do that as long as oldIE is supported.

My site still has many IE7/8 visitors but I want to use jQuery 2.0. Can I do that? If your web site needs oldIE support, and we expect most sites will need it for at least another year or two, you can use IE conditional comments to include version 1.9 only when visitors are using oldIE:

<!--[if lt IE 9]> <script src="jquery-1.9.0.js"></script> <![endif]--> <!--[if gte IE 9]><!--> <script src="jquery-2.0.0.js"></script> <!--<![endif]-->

Why not make an “oldIE plugin” for jQuery 2.0? Special dispensations for oldIE are sprinkled throughout jQuery. Refactoring the code to provide enough hooks so that oldIE support could be added as a plugin would complicate the code for the modern browser case. Plus, developers supporting oldIE and using a public CDN would then need to include two files (jQuery 2.0 and the oldIE plugin) instead of one.

Once jQuery 2.0 is released, what happens to 1.9? In a departure from the past, we’ll continue to fix bugs in 1.9 (as minor releases). Having just gone through a spring cleaning for 1.8 and 1.9, we don’t anticipate adding a lot of new APIs in the future. Instead, we prefer to add new functionality through plugins compatible with both versions where it makes sense. So don’t feel like you’re being left behind when using version 1.9.

Is jQuery 2.0 basically for mobile devices? No. Although jQuery 2.0 will be a great fit for HTML mobile apps, including ones written with jQuery Mobile, it is not a Webkit-only library that targets just iOS and Android. In addition to mobile browsers, 2.0 will support (and be tested!) with modern desktop versions of Internet Explorer, Opera, Firefox, Safari, and Chrome.

How much smaller/faster will jQuery 2.0 be? We won’t know until we’re done, or at least close to being done. You can bet that we’ll tell you more as the release date for 2.0 draws near. Better yet, you can try the beta when it is released and see for yourself!