[T4] ValidationDelegate to edit attributes?

[Norman Franke]

I'm trying to develop a customized ValidationDelegate that add a  
class to fields with an error. It works if the field doesn't already  
have a class attribute. What I want to do is add the class name to  
the existing attribute. Just adding one yields two class=""  
attributes, which doesn't seem to render properly. (The second one is  
completely ignored in some browsers.)

How can this be done? This is using Tapestry 4.0.2.
-Norman




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