[jQuery] AutoComplete and Validate

Hello,
I am using AutoComplete which gets a list using JSon.
Then I also have Validate to check if all values inserted are valid.
This uses JSon true.
What happens is when I am typing and the list is visible the input are
also being validated.
Is not possible to make the validate fired only when I select one item
from the list or when I submit the form?
Thanks,
Miguel