When using ExplorerCanvas (excanvas) to emulate the Canvas object in Internet Explorer it might be a good idea to check that the excanvas lib really is loaded before trying to create a context object. If not, an informative error message may be displayed instead of some cryptic “object doesn’t support this property”. Here is a [...]
Traditional data retrieval (in JSON, XML or whatever) using XMLHttpRequest is limited to requests on the same domain. A way to work around this limitation is to use JSONP. The ‘P’ stands for Padding. The main concept is to dynamically create a script tag and set its source attribute to the URL of the service [...]
Useful convenience methods for array manipulation in Javascript. Array.indexOf() Find index of given element in array. This method is implemented in some browsers, but not all. Array.remove() Remove element in array (depends on indexOf method). Simply add these two your Javascript file augment the functionality with the existing Array implementation.
AJAX Libraries API currently hosts jQuery, prototype, script.aculo.us, MooTool and dojo.
John Resig ported the Processing visualization language to JavaScript, using the Canvas element. Get Processing.js. Fancy s*it, in JavaScript!