Alert and Cancel Submit Script When Input ==null

Alert and Cancel Submit Script When Input ==null


Hi,
 
I have created an app that is used for people to apply for a job.  Everything is fine on the form side.
 
I have fields that are hidden on the form that are shown in the view.  This is so that I can add notes for each persona from the View.
 
I am trying to make it a required field or setup a script so that when I go in to "edit" I have to enter something in this notes field.
 
Nothing in the script builder selections is working.
 
Can this be done?
 
How?