Javascript library to manage Flash Local Stored Objects

In an earlier post, I explained how to use Javascript to talk to a Flash file to create and read Local stored objects, a.k.a. Flash cookies.

The only hitch I met was that I couldn’t create cross domain cookies this way as I was hitting the same domain policy. However as pointed out in the comments, it is possible, and simple too… I just needed to add… Continue reading “Javascript library to manage Flash Local Stored Objects”

Create a smart, cross browser floating menu using Javascript

I recently wrote a Javascript library to show a floating menu that works cross browser and displays the menu based on a set of co-ordinates that you pass it.

The floating menu is just an absolute div that is hidden from view.

The library is smart in the sense that it determines where best to display the menu. It works out where you have scrolled to on the page and figures out if there is space at the top or bottom and to the left or right of where ever your target co-ordinates are.

This is useful where you want to display a menu, or some div, but you don’t know (or care) where the menu is going to be needed on the page.
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JavaScript Tricks; URLEncode, Foreach and Remove last character

I have come across some neat (if not mind blowing) tricks with JavaScript recently.

Firstly, I needed JavaScript code that copied PHP’s urlencode().
This function returns an encoded string where all non-alphanumeric characters except – _ . are replaced with a percent (%) sign followed by two hex digits and spaces encoded as plus (+) signs.

JavaScript has 2 functions to emulate urlencode(), but both fall short…
The escape function encodes all non-alphanumeric characters except * @ / + – _ .
The encodeURIComponent function encodes all non-alphanumeric characters except spaces and ! ‘ ( ) * ~

The winner for me though is encodeURIComponent as it encodes all UTF-8 characters while escape only encodes ISO Latin characters.

With this in hand, mozilla help provide a neat function.
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JavaScript, ExternalInterface, Flash and Local Shared Objects

I was looking into flash’s local shared objects ( from here on LSO’s ) recently as a method of data persistence on a clients browser as the plain old HTTP cookie has its limitations.

LSO’s are like cookies and are sometimes referred to flash cookies but there are 2 main differences between them. A normal HTTP cookie can store around 4k of data, while the flash cookie can store up to 100k. Also a normal cookie is pretty easy to remove while removing a flash cookie is far more convoluted, which is a matter of some contention.
Continue reading “JavaScript, ExternalInterface, Flash and Local Shared Objects”