jQuery 1.8.0 is released by jQuery on 09-Aug-2012 by jQuery team.
Sizzle re-architected: jQuery’s selector engine is faster than ever, thanks to a rewrite (well, reallytwo rewrites) by Timmy Willison. Sure, most browsers have
querySelectorAll nowadays, but nearly every implementation falls short in one way or another, creating a road full of cross-browser potholes. Sizzle smoothes that road for you. Plus, you may want those useful jQuery selector extensions like
:has() with a complex selector or
:contains(). Oh yeah, and there’s still IE6/7 support.
Animations re-imagined: Over time, the animation code in jQuery had become kind of messy. Corey Frang took a head-first dive into that swamp and managed to remove most of the alligators, um, bugs. Most of the changes are under the covers, so existing animations should just work (and work better). But there are also some awesome additions to make animations more general and extendable. One notable and very cool feature is the use of the progress callbacks in Promises. We’re still working on detailed documentation, but we do have a draft. Also, here’s an example of the new code in action: http://jsbin.com/odocid/1/edit.
Automatic CSS prefixing: When you use a CSS property, in either
.animate(), we’ll use the correct prefixed property (when appropriate) for that browser. For example, take
.css("user-select", "none"); in Chrome/Safari we’ll set the value as
"-webkit-user-select", Firefox will use
"-moz-user-select", and IE10 will use
More flexibility with $(html, props): In jQuery 1.8, you can use any jQuery method or plugin in the object passed to
$(html, props). Before, you could only use a short list of method names, and there was no documented way to add to the list. Now there doesn’t need to be a list at all! Be aware, however, that this can cause the behavior of your code to change if plugins are added later that have the same names as HTML attributes.
More than 160 bugs closed: The Sizzle and animation rewrites in particular provided the impetus to fix several long-standing bugs–some of which have been around for two or three years. Mike Sherov tackled most of the open CSS and positioning issues, getting us down to near-zero bugs there. We also haven’t given up and are still pounding away to eliminate annoying differences between IE 6/7/8 and modern browsers, so you don’t have to deal with them.
Smaller code size: Despite all the code cleanup, new features, and bug fixes, the gzipped file size of jQuery 1.8 is actually a few hundred bytes smaller than jQuery 1.7.2. Size reduction wasn’t our primary goal in this version, but we felt it was important to hold the line on code growth, and we definitely achieved that. Many thanks to Richard Gibson for leading the code-crunching charge across the entire project.
Modularity: If you know your project’s jQuery dependencies well, you can use the new
grunt-based build system to strip out parts of jQuery that you know you don’t need. What we’ve done here for 1.8 is really just a beginning, you’ll see even more flexibility as we move to later versions.