[Rails] Doint something with each field in form as it is entered

Is there a callback or some mechanism that will allow me to modify a
view once a field in a form is finished .... asumming that there are
multiple fields in a form.

As a silly example, let's say the bacground of the filed is white by
default ... but once the user goes on to the next field, then make the
background of that field red if the number of characters in the field is
even.
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