John Resig - Asm.js: The JavaScript Compile Target
Like many developers I’ve been excited by the promise of Asm.js. Reading the recent news that Asm.js is now in Firefox nightly is what got my interest going. There’s also been a massive surge in interest after Mozilla and Epic announced (mirror) that they had ported Unreal Engine 3 to Asm.js – and that it ran really well. Getting a C++ game engine running in JavaScript, using WebGL for rendering,
John Resig - A Strategy for i18n and Node.js
Recently I internationalized a Node/Express web application that I’ve been working on and it seems to have gone fairly well (users in multiple languages are using it happily and I’m seeing a marked increase in traffic because of it!). Not much of what I’m writing up here is particular to Node, per se, just a general strategy for internationalizing a web application. I’ve used enough internationali
John Resig - Learning from Twitter
An issue popped up on Twitter this past week that caused the web site to be generally unusable for many users. It appears as if attempts to scroll were unbearably slow and caused the site to be unresponsive. The Twitter team investigated and determined that if they reverted the version of jQuery that they used back to 1.4.2 from 1.4.4 the site would be responsive again. After more investigation th
John Resig - Thoughts on querySelectorAll
I don’t think there’s a single JavaScript developer who isn’t excited about the new Selectors API specification (and the upcoming implementations). I’ve been following the progress of the specification (and implementations) and have been asked to provide some feedback to the Web API working group. What follows is an email that I sent to the public-webapi mailing list. I just wanted to quickly pull
John Resig - Secret Omens: Book Update
Jeff Atwood wrote up a post today on the merits of writing a technical book in this day-and-age and specifically called out my past post on programming book profits and my work-in-progress Secrets of the JavaScript Ninja. I wanted to give a brief status update on the book and how it’s going. I started the book in early 2008 and was actually quite productive, finishing nearly the entire book that y
John Resig - Pure JavaScript HTML Parser
Recently I was having a little bit of fun and decided to go about writing a pure JavaScript HTML parser. Some might remember my one project, env.js, which ported the native browser JavaScript features to the server-side (powered by Rhino). One thing that was lacking from that project was an HTML parser (it parsed strict XML only). I’ve been toying with the ability to port env.js to other platforms
Learning Advanced JavaScript
Double-click the code to edit the tutorial and try your own code. This tutorial contains code and discussion from the upcoming book Secrets of the JavaScript Ninja by John Resig. Our Goal Goal: To be able to understand this function: // The .bind method from Prototype.js Function.prototype.bind = function(){ var fn = this, args = Array.prototype.slice.call(arguments), object = args.shift(); return
John Resig - jQuery 1.6 and .attr()
jQuery 1.6 and 1.6.1 are out the door. Congrats to the team and everyone that was involved with the release! A relatively controversial change in 1.6 was regarding how attributes and DOM object properties were handled. In 1.6 we wanted to take the major step of completely separating the two, allowing us to create an .attr() method that wasn’t quite so mealy-mouthed with regards to how attributes w
John Resig - Revised JavaScript Dictionary Search
After my two previous posts discussing dictionary lookups in JavaScript and JavaScript Trie performance analysis even more excellent feedback came in from everyone. Out of all the results two techniques seemed to be most interesting – and promising for reducing general memory usage and load time. String-based Binary Search The first technique proposed was left as a comment by a commenter named Ran
John Resig - Next Steps in 2011
Today I’m announcing a major change in my life: I’m leaving Mozilla Corporation and joining Khan Academy. I joined the Mozilla Corporation in January of 2007, just over 4+ years ago, as a JavaScript Evangelist. During my time at the company I had an amazing opportunity to promote JavaScript. It’s been an incredible experience working with everyone at Mozilla. The company is easily one of the most
John Resig - Talk: The DOM is a Mess
I gave a talk last week at Yahoo (at the request of the YUI team) all about the DOM. I outlined some of the reasons why the current situation is such a mess, outline some strategies for working around it, and then give some examples of real world code that’s being implemented in libraries today. Posted: February 2nd, 2009 Subscribe for email updates 56 Comments (Show Comments) Comments are closed.
John Resig - .nodeName Case Sensitivity
When working with the DOM .nodeName property there are two hard-and-fast rules that most people abide by: The node names of HTML elements are always uppercase, even if they’re explicitly created using lowercase characters. <html> will result in a .nodeName === "HTML" (see the HTML 5 draft). The node names of XML elements are always in the original case, as specified when they’re created. <data> wi
John Resig - Deep Tracing of Internet Explorer
After reading a recent post by Steve Souders concerning a free tool called dynaTrace Ajax, I was intrigued. It claimed to provide full tracing analysis of Internet Explorer 6-8 (including JavaScript, rendering, and network traffic). Giving it a try I was very impressed. I tested against a few web sites but got the most interesting results running against the JavaScript-heavy Gmail in Internet Expl
John Resig - Google Groups is Dead
As far as I’m concerned, Google Groups is dead. For the jQuery project we’ve run all of our community discussions through Google Group mailing lists for the past three years. At this moment the main jQuery group is the second most popular programming group (next to Android developers) clocking in at over 21,000 members. We also have the jQuery Dev and jQuery UI groups. The main jQuery group averag
John Resig - Accuracy of JavaScript Time
There were two events recently that made me quite concerned. First, I was looking through some of the results from the Dromaeo test suite and I noticed a bunch of zero millisecond times being returned from tests. This was quite odd since the tests should’ve taken, at least, a couple milliseconds to run and getting consistent times of “0” is rather infeasible, especially for non-trivial code. Secon
John Resig - Computing with JavaScript Web Workers
Web Workers are, undoubtedly, the coolest new feature to arrive in the latest version of web browsers. Web Workers allow you to run JavaScript in parallel on a web page, without blocking the user interface. Normally in order to achieve any sort of computation using JavaScript you would need to break your jobs up into tiny chunks and split their execution apart using timers. This is both slow and u
John Resig - OCR and Neural Nets in JavaScript
A pretty amazing piece of JavaScript dropped yesterday and it’s going to take a little bit to digest it all. It’s a GreaseMonkey script, written by ‘Shaun Friedle‘, that automatically solves captchas provided by the site Megaupload. There’s a demo online if you wish to give it a spin. Now, the captchas provided by the site aren’t very “hard” to solve (in fact, they’re downright bad – some examples
John Resig - Versions of JavaScript
With the recent talk of JavaScript 1.9 there’s been some confusion as to what exactly that version means – especially in relation to other browsers. Here’s a quick breakdown: IE 6-7 support JScript 5 (which is equivalent to ECMAScript 3, JavaScript 1.5) IE 8 supports JScript 6 (which is equivalent to ECMAScript 3, JavaScript 1.5 – more bug fixes over JScript 5) Firefox 1.0 supports JavaScript 1.5
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