John Resig - Re-Securing JSON
Back in March/April of this year there was a lot of hub-bub concerning the discovery of a JSON data leak, or sorts. What it boils down to is “JavaScript is incredibly flexible, even to the degree of letting you redefine basic objects, like Array or Object itself.” For example, here’s an exploit that works in Firefox 2, Opera 9, and Safari 3. It goes about redefining the global Array object then ma
John Resig - Processing.js
As a sort-of reverse birthday present I’ve decided to release one of my largest projects, in recent memory. This is the project that I’ve been alluding to for quite some time now: I’ve ported the Processing visualization language to JavaScript, using the Canvas element. I’ve been working on this project, off-and-on now, for the past 7 months – it’s been a fun, and quite rewarding, challenge. The f
John Resig - Embedding and Encoding in JavaScript
A crude JavaScript implementation of the first stage of Super Mario Brothers has been making the rounds today. It’s roughly playable but misses many key aspects (no mushrooms, no flag, no one-ups, etc.). However, that’s not what’s particularly interesting about the game. Perhaps the most interesting part of the application is not within the game mechanics itself but in the fact that all of the gam
John Resig - Classy Query
NOTE: This was an April Fools joke for April 1st, 2008. Over the past two years, seeing hundreds of thousands of people use jQuery, a major point has become apparent: jQuery simply isn’t able to scale to handle the development needs of most power users. It lacks the clarity and power functionality that most developers need in order build applications in a collaborative environment. For this reason
John Resig - Simple JavaScript Inheritance
I’ve been doing a lot of work, lately, with JavaScript inheritance – namely for my work-in-progress JavaScript book – and in doing so have examined a number of different JavaScript classical-inheritance-simulating techniques. Out of all the ones that I’ve looked at I think my favorites were the implementations employed by base2 and Prototype. I wanted to go about extracting the soul of these techn
John Resig - JavaScript Talk at Northeastern
Yesterday I gave a presentation for the local ACM of Northeastern University. I covered the basics of JavaScript – targeted to a Computer Science major (in the case of the students at NU, they learn Scheme and Java so I emphasized the subject matter to that audience). I did a fast run-through of the whole language, covering the main points, and move on to a quick inspection of jQuery and the DOM –
John Resig - Bad Object Detection
A common technique for writing cross-browser JavaScript code is to detect the features that you wish to use before you actually use them. Good object detection is done on a case-by-case basis, analyzing each feature as it’s encountered. Some common examples of object detection: // Is XPath querying available? if ( document.evaluate ) {} // Does the element have style information? if ( element.styl
John Resig - A Typical HTML Page
When doing DOM-based performance testing you frequently need to pick a sample HTML document to work against. This raises the question: What is a good, representative, HTML document? For many people a good document seems to file into one of two categories: A large web page with a lot of content. When we did our initial performance testing with jQuery we used Shakespeare’s As You Like It (lots of el
John Resig - The State of JSON
I wanted to pull together some of the recent events that have occurred, related to native JSON support within a web browser, that should be of importance to many web developers. This should serve as a sort-of follow-up to my previous post: Native JSON Support is Required. Early API Standardization Attempts – Last year, a number of attempts were made by the ECMAScript language committee to standard
John Resig - Sub-Pixel Problems in CSS
Something that jumped at me, recently, was a rendering dilemma that browsers have to encounter, and gracefully handle, on a day-by-day basis with little, to no, standardization. Take the following page for example. You have 4 floated divs, each with a width of 25%, contained within a parent div of width 50px. Here’s the question: How wide are each of the divs? The problem lies in the fact that eac
John Resig - ECMAScript 4 Speaking Tour
During the past two weeks I’ve given three presentations on Tamarin and ECMAScript 4. I’ve gotten a ton of great feedback, criticism, and commentary – all of which has been very helpful. » Tamarin and ECMAScript 4 Here’s a quick re-cap of how the talks went: Ajax Experience East (The Future of JavaScript) There were some very smart questions asked by the audience here – and some pressing concerns.
John Resig - Secrets: Table of Contents
After all the terrific feedback that I received from my post on the Untold Secrets of JavaScript I began to compile a Table of Contents that would serve as a guide for the rest of my next book (final title or publisher as yet to be determined). I’d love some feedback as to the structure and contents of the full table of contents, as it stands: Introduction (Overview of the contents of the book; in
John Resig - The World of ECMAScript
So I did a little bit of digging and I’ve pulled together something fun: I call it “The World of ECMAScript“. It’s a full map detailing everything that exists within the world of ECMAScript (with JavaScript, ActionScript, and JScript being its most-famous implementations). Right now I’m only showing things that can be built on top of (languages, engines, browsers, servers, etc.) – not end user app
John Resig - Future of Firefox and JavaScript
I just finished giving a presentation at the Future of Web Apps conference, here in London. Thanks to everyone who attended – I hope I didn’t sound too sleep deprived! In this talk I covered new features coming in Firefox (that should be interesting to developers) and talk a little bit about how the JavaScript language is advancing. You can find the full slides here: The Future of Firefox and Java
John Resig - Bringing the Browser to the Server
This weekend I took a big step in upping the ante for JavaScript as a Language. At some point last Friday evening I started coding and didn’t stop until sometime mid-Monday. The result is a good-enough browser/DOM environment, written in JavaScript, that runs on top of Rhino; capable of running jQuery, Prototype, and MochiKit (at the very least). The implications of this are phenomenal, and I’m no
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John Resig - JavaScript Development Tools
John Resig - The Seedy Underbelly of JavaScript