Thinking this through a bit more (why hasn't somebody written a 
"delay-submission-whilst-the-<talk-to-the-duck>-effect-takes-place" browser 
plugin yet?), this is part of a bigger question about om's app-state and the UI 
system-of-record.

I am treating the app-state as *the* system-of-record, not just as the 
knowledge the UI needs to function. Changes to this system-of-record are of 
more interest then the user entering data into the UI for example, even if they 
are functionally equivalent. In addition, "Controllers" are much less a 1st 
class citizen as the app-state is starting to act like a communication channel. 
Things happen in response to changes in the app-state. 

It will be interesting to see how scalable this approach is or whether 
"Controllers" end up being justified...

On Monday, 12 January 2015 10:28:55 UTC, Colin Yates  wrote:
> Hi all,
> 
> My use-case is that if anything in a form changes I want to do the same thing 
> (e.g. validation). Actually, for this use-case I want to see if an existing 
> record matches when they enter a new record.
> 
> In general, I want to do action X if any of a set of cursor paths value's 
> change.
> 
> I could add a call to (action-x) in the on-change event for each UI 
> component, which is a bit noisy. Similarly, the on-change events could put! 
> into a tapped channel, one reader is the real on-change the other is 
> (action-x) and so on.
> 
> Or, and I really don't know if this is great or awful, I could define an 
> om-component which has no UI at all, but implements (action-x) on render.
> 
> How do you handle this?
> 
> (P.S. It is at times like this I miss AspectJ)

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