What do i use for names and id in forms with repeated rows

Question

I'm programming an order form that has multiple order items. Each line item is a row in form, identical to the previous row. I'm wondering what the convention for names and ids on the input fields. Do i use the same names and id for the fields in each row?

How do I reference an input field within a particular form row?

How do i reference the rows of the form as an array?

What's the best programming approach?

for example:

item quantity item_price total_price item quantity item_price total_price item quantity item_price total_price

thanks

Answer 1

I usually add the line number before/after it so that if I need reference it for AJAX and such, it has a unique name.