I have a lightning component which contains input fileds(checkbox and picklist). These fields are not related to any object. 
How can i pass the field values from component to JS controller on click of submit button??

NOTE: I cannot make use of Component.find() or aura:attribute as the fields on the component are populated through aura:iteration.
Any help would be highly appreciated.

I have a lightning component which contains input fileds(checkbox and picklist). These fields are not related to any object. 
How can i pass the field values from component to JS controller on click of submit button??

NOTE: I cannot make use of Component.find() or aura:attribute as the fields on the component are populated through aura:iteration.
Any help would be highly appreciated.