[validate] Is it possible to trigger validation on blur without having anything in the field first?

[validate] Is it possible to trigger validation on blur without having anything in the field first?

Right now validation is only triggered when I have something entered in a field, i.e. if I click on a field, type something, delete all of it, then click on the next field, validation won't trigger.

I want to be able to trigger validation after I first focus on a field and then focus out, even if I didn't type anything.

If there's no existing option to change this, can someone point me to part of the source code where one would need to change so that I can change it myself? (Sure, I can try to decipher all the codes myself, but it's nice to save some time.)

Thanks a lot.