>Only had time for a quick look.
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>If you use the default angular $asyncValidator then there's a built behaviour which means a resolved promise translates to valid and a rejected promise to invalid (so basically a true/false option) but I don't see how you could access any parameters passed in the resolve() or reject() (e.g. messages from server).
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>OTOH, a role your own directive (as in the examples in my link) would allow you to display the messages.
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>But the obvious disadvantage with the latter is that it would not have the angular behaviour of only running if all local validations have succeeded - which may or may not be a factor in your situation......
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That particular field has MaxLength 100 condition. I also realized that in addition to the value I need to also pass an Id so if the value already exists for that same Id, it's OK.

It is going to be a tricky implementation.