JQScriptGenerator changes event attribute methods so they don't create the attribute

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Philippe and I were discussing this at ESUG - it's been sitting in my email 
inbox as a todo since then so I want to put it here so it isn't lost.

We noticed that all the event attribute methods on WATagBrush (#onChange, 
#onSelect:, etc) delegate through the script generator and that 
JQScriptGenerator implements #event:do:on: such that the attribute requested is 
never actually created (IDs are instead generated and load scripts are added).

We weren't convinced this was very nice since behaviour on WATagBrush tends to 
be pretty low-level and fairly directly mapped to HTML. This implementation 
makes it tricker to generate specific HTML (you would have to resort to using 
#attributeAt:put:).

Our suggestion was to have have the methods that map to attribute names simply 
set the attributes and have a higher-level interface that can make smarter 
decisions. Rather than implementing a duplicate set of methods for all the 
events, perhaps WATagBrush could simply implement #on:do:? (or #on:script: or 
similar? it's maybe better not to reuse #on:do: here...). The first parameter 
could be strings/symbols or maybe it would be nicer to have some kind of 
JSEvent object(s) that could be passed in?

Original issue reported on code.google.com by [email protected] on 12 Jan 2012 at 9:49