Using a single validator of a schema

Hi,

Is there a way to use just one validator out of a schema?

I use javascript on the client-side to send a request
asking "is this input field ok?" when the field loses focus.
It would be great if I could somehow reuse a part of a schema
without having a full dictionary of values.

Any links to documentation I may have missed greatly appreciated.

-Ari Turpeinen


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