View#serialize Enhancement

[gf3]

Ran into an issue the other day of trying to detect the case when a serialize fails (due to validateInput returning errors). I had resorted to a once listener for the invalid event and then cancelling the listener if serialize passes.

I think a better solution would be for serialize to either return a promise or accept an error callback (or both—success and error callbacks could be sugar on a promise).

Anyway, I'd be willing to submit this patch, I just wanted to gauge interest first.

Thoughts?

[kpdecker]

promises: we're not going to convert a single API to this due to both overhead of including a promises library and having just one API using promises is weird.

callback: This seems reasonable as there is already another callback here. Glad to look at a PR.