A bit over a week ago Chris Heilmann published a post on table of contents generators, where he listed a couple of JavaScript methods to do that. It’s been always in the plans to optimize the performance of my own implementation of the HTML5 outlining routine – and what better way to measure it, than to compare it with some other approaches while I’m at it. To no surprise, I lost. Big time.
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This week I had a joy of spending several hours trying to solve and intermitently happening bug. In short, some 2 times out of 3 the YUI selector utility failed to lookup elements in an XHR loaded HTML fragment. After digging quite deep into the YUI code, I found that it was actually the fault of the way ASP.NET MVC treats partial views.

Summary

• ASP.NET MVC allows use of ASCX as “partial views”
• It correctly assumes, that uniqueness of ClientID should be preserved
• It incorrectly does not prepend an alpha-character to automatically generated GUID based IDs
• User agents and selector libraries may correctly ignore such invalid IDs
• Solution: override ViewUserControl.UniqueID

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Pretty much two weeks ago I dropped my notes from FullFrontal 2009 onto developer’s forum at work. And one full colleague of mine enquired why did I say that “javascript:void(0) must die”. I didn’t really have a chance to follow it up until now (happy birthday, dear blog).
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