onChangeView event or .invalid state on .prev and .next

[jcubic]

I need this event, but I actually I need .prev and .next to have class .invalid when you can't go prev or next because the date is out of range. I have my own style on top of the library and I need to hide .next and .prev, when you can't got next or prev month.

I've tried to use:

$(document).on('change', '... select', function() {
});

but this event is not triggered, I have no idea why, I don't see return false or .preventDefault() in the library for change event. Some part of my application code may interfere with the library.

I can contribute with the code if you're willing to merge. I wanted to modify my copy, but it would be nice to have this in library.