Simon Willison’s Weblog

597 items tagged “javascript”

2006

Fjax: Just say no

To my utter amazement, a decent amount of buzz appears to be building around a new “technology” called Fjax—much of it centred around this interview on Webmonkey, but also benefiting from a mention on the O’Reilly Radar and of course the obligatory Digg story.

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Brad Neuberg introduces dojo.storage. Incredibly technically impressive, embodying months of accumulated expertise. # 1st May 2006, 11:33 pm

Speaking gigs

I’ve been doing a fair amount of public speaking recently, based on the principle that the only way to get good at it is to get a lot of practise. My last two talks were a session on Django and Web Application Frameworks at the ACCU 2006 conference and a talk on the Yahoo! Developer Network for NMK’s Beers and Innovation series.

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An S3 AJAX Wiki. Les continues to innovate against S3. # 22nd April 2006, 7:09 pm

JavaScript apps with read/write access to S3. JS apps hosted on S3 could read and write to the store. # 4th April 2006, 9:33 am

Learning Flash for programmers?

I’ve decided it’s about time I learnt some Flash, mainly because of the exciting opportunities posed by the Flash-JavaScript bridge. It’s become pretty obvious now that Flash is the most practical option for dealing with audio and video on the Web, and the bridge means that anything Flash can do is now available to JavaScript as well. Google Finance and the Yahoo! JS-Flash Maps API are just two recent examples of why this stuff is worth knowing more about.

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Form Hijack (via) Neat unobtrusive JavaScript trick—use document.onclick to catch events before page has loaded. # 21st March 2006, 10:43 am

My ETech JavaScript tutorial

I gave a three hour JavaScript tutorial at ETech this morning, aimed at people with previous programming experience who hadn’t yet dived deep in to JavaScript as a programming language. It seemed to go pretty well—some good questions were asked at various points and a few people told me afterwards that they had found it interesting.

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Yahoo! UI JavaScript treats

The Yahoo! Developer Network was updated yesterday with a veritable gold-mine of Exciting New Stuff, coinciding with the launch of the brand new Yahoo! User Interface Blog.

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Yahoo! UI Library. Open Source JavaScript widgets and libraries. # 14th February 2006, 1:12 am

Escaping regular expression characters in JavaScript

JavaScript’s support for regular expressions is generally pretty good, but there is one notable omission: an escaping mechanism for literal strings. Say for example you need to create a regular expression that removes a specific string from the end of a string. If you know the string you want to remove when you write the script this is easy:

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2005

The Dojo Manual (via) Dojo finally gets some really good extensive documentation. # 24th December 2005, 6:21 pm

Don’t be eval()

JavaScript is an interpreted language, and like so many of its peers it includes the all powerful eval() function. eval() takes a string and executes it as if it were regular JavaScript code. It’s incredibly powerful and incredibly easy to abuse in ways that make your code slower and harder to maintain. As a general rule, if you’re using eval() there’s probably something wrong with your design.

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Rich Text Editing With Dojo. Utterly fantastic. Beautiful API, and it even works in Safari. # 8th November 2005, 12:52 am

TurboDbAdmin. Ajax phpMyAdmin clone built on Dojo. Worth trying the live demo. # 4th November 2005, 3:27 pm

Firefox 1.5 developer highlights

Firefox 1.5 Beta 1 is out, and is the most exciting browser release in a very long time. It comes with the Gecko 1.8 rendering engine, which includes a ton of interesting new features. New in this version (unless you’ve been tinkering with the Deer Park series):

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Understanding the Greasemonkey vulnerability

If you have any version of Greasemonkey installed prior to 0.3.5, which was released a few hours ago, or if you are running any of the 0.4 alphas, you need to go and upgrade right now. All versions of Greasemonkey aside from 0.3.5 contain a nasty security hole, which could enable malicious web sites to read any file from your hard drive without you knowing.

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Staying social

June is finals month, but the call of @media 2005 is hard to resist. I won’t be attending the actual conference (sadly my student budget doesn’t stretch that far) but I’ll be in London on Saturday the 11th to ride on the coat-tails of the conference.

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Stuart’s book

I meant to mention this earlier, but Stuart’s book, DHTML Utopia: Modern Web Design Using JavaScript & DOM, has been published. I worked as a technical editor on the book, and I’m proud to have been associated with it. Don’t worry about the hairy title (apparently you have to have DHTML in it or bookshops won’t know where to put it / people won’t know what it’s about), the inside is pure gold. In their usual style, SitePoint have posted the first four chapters online for your perusal so you don’t have to take my word for it, you can try it out for yourself.

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Firefox Counter. How the Firefox counter works. # 28th April 2005, 6 pm

Safari 1.3 has a JavaScript Console

My single biggest complaint about Safari in the past has been its terrible support for JavaScript debugging. Safari 1.3 has just been released, and tucked away in the Debug menu is a brand new JavaScript console option. It’s not as good as the Firefox equivalent (it throws up far too many “Undefined value, line: 0” errors for my liking) but it’s a big step in the right direction.

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Flickr without the Flash

One of my favourite panels at SxSW this year was the Flash vs. HTML Game Show, in which a team of HTML/JavaScript gurus took on a team of Flash gurus showing off pre-prepared solutions to tasks set for the panel. One of the challenges was to come up with enhancements to Flickr using the team’s assigned technology.

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Greasemonkey: Hacking the Web with JavaScript. Greasemonkey rocks! Here’s a simple tutorial from Michael Moncur. # 8th January 2005, 12:38 pm

2004

The Register hit by XSS

Here’s a nasty one: popular tech news site The Register was hit on Saturday by the Bofra exploit, a nasty worm which uses an iframe vulnerability in (you guessed it) Internet Explorer to install nasty things on the victim’s PC. Where it gets interesting is that the attack wasn’t against the Register themselves; it came through their third party ad serving company, Falk AG.

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Executing JavaScript on page load

Peter-Paul Koch recently wrote:

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2003

Silly JavaScript Security. “Sorry, you do not have permission to press this key,” # 5th December 2003, 10:42 pm

getElementsBySelector()

Inspired by Andy, I decided to have a crack at something I’ve been thinking about trying for a long time. document.getElementsBySelector is a javascript function which takes a standard CSS style selector and returns an array of elements objects from the document that match that selector. For example:

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