jQuery – test if element is in viewport (visible on screen)

/UPDATE: the most recent version of this plugin is now available on github: https://github.com/moagrius/isOnScreen. Forks (and hopefully improvements) welcome. /UPDATE: if you’re looking for a how-to on lazy-loading content, images, or event effects, there’s a simple outline using this plugin available here. /UPDATE: this is probably all you need. Original Version returns true if any […]

jQuery – copy style (copyCSS)

UPDATE: this is now available on github per requests – forks welcome. Added some options for white- and black-lists as well. https://github.com/moagrius/copycss UPDATE: update to address reported problems with Opera (thanks Vincent). Method to copy all styles (inherited, native, descended, inline, etc) from the @param source element, to the invoking element:

Understanding Easing (Explaining Penner’s equations) – JavaScript and ActionScript

Despite the commonality of the classic easing equations, largely attributed to Penner, there doesn’t seem to be the in-depth examination of “how it works” that a lot of code is subject to nowadays. First, a quick clarification on the most popular easing Classes. The “standard” easing classes (that provide predictable inertia), are Linear, Quad, Cubic, […]

CodeIgniter – AJAX + Session bug fix

If you’ve used AJAX-heavy web apps built on a CI backend, you might have noticed premature session expiration, even if you’re expiration was set to never expire ($config[‘sess_expiration’] = 0; in application/config/config.php) This was apparently due to AJAX requests not regenerating sessions, and apparent collisions. Long story short, last month there was a patch introduced […]

PHP – really simple linkify

we all know that it’s impossible to perfectly match URLs from human input… but i spent a little time compiling various solutions on the boards and have ended up with this (note – this is largely pieced together from other sources – I’m not claiming original work):

The more difficult part was differentiating what […]

20 Tips to Optimize your ActionScript

Update 09/29/12 This article was written several years ago for Experts Exchange, and has proven to be a little more controversial than I expected or intended, mostly due to the (admittedly vague) reference to what I call AS3’s “fake” lazy evaluation, which happened to be (rather randomly) listed as the first tip. I’m removing that […]

(Really) Simple JavaScript Inheritance

/UPDATE: newest version, provides super property, does not invoke parent constructor. can call super methods with this.super.method(args), or constructor with this.super.constructor.call(this);

/END UPDATE. From here down consider legacy There are several approaches to forcing JavaScript inheritance to behave like other, more natively-OOP languages, from Dean Edwards Base.js, to John Resig’s take on it, to […]

CSS – Horizontally center a row of floated elements

Despite the boards being full of people insisting it’s impossible, you can center a row of floated elements even with fluid (unknown) width. The process is: 1. Wrap the container in an element with:

2. On the main container, add the following:

That’s really all there is too it. An example might look […]

PHP – seriously simple Router

/UPDATE I’ve come to prefer (the very similar) RegexRouter. I’m increasingly uncomfortable with the string replacement in the route method. My upshot of PHP routers (inspired by the various micro-frameworks, like Slim, Silex, F3, Laravel, Tonic, Flight, Klein, etc).

Usage…

JavaScript RegExp to remove comments

UPDATE 02/16/13 As the gentleman in the comments pointed out, it’s (practically) impossible to use a single regular expression to appropriately remove all comments from javascript (or any construct with strings), and I’d assume virtually impossible to do so even with a series of patterns. I suspect a full-fledged (but simple) parser is required, so […]