Populating a dropdown list with array built from items in a table

I'm trying to script a form which would include a user-defined dropdown list.

So in my form, I have a simple single-column dynamic table in which the user can add and delete rows. In the same form, I have a dropdown list. I want to build an array from the table, and then populate the dropdown list from that array.

Can anyone help me figure this out?

Thanks!

Jo