i am using JSF 2.
I would like to update a field which is outside a dataTable and is the sum of a column from a dataTable.
The fields of this column are editable, so the user can change the quantities.
Then he clicks on a button and it should update the total.
I have been thinking about working with the DataModel of the list i use to populate that dataTable but i am still trying to find out what the DataModel can do for me in that case.
I am new with the DataModel class.