Microsoft Ajax events - part 1: subscribing
When building Ajax applications, you basically deal with two kinds of events. First, there are DOM events , and second, events from JavaScript objects. This second category is not part of the EcmaScript specs (or of the DOM specs, of course) so each framework needs to define its own pattern to expose events. This makes it more difficult for developers to include components built on different frameworks into a single page, which is one of the problems that OpenAjax tries to solve. I'll get back to this in a future post and show how to integrate Microsoft Ajax events in the OpenAjax hub. As with other parts of the Microsoft Ajax framework, we've tried to adhere to the .NET patterns as much as possible when we designed events in Microsoft Ajax
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Read the complete post at http://weblogs.asp.net/bleroy/archive/2007/05/16/microsoft-ajax-events-part-1-subscribing.aspx