Is there any Event call in JS file when we import data in excel file?

i am importing data in excel file. I tried to use some event like , on_submit, before_save etc in my doctype js file but this function is not called. Maybe Import Data Tool inserting data directly into database. But I need to get every document when it is saved and from this document i will save some data to another doctype.

So how can I get every document ?