[JSF 2] Update the total of an editable column from a dataTable

Hi,
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.
What about listeners ? events ?
Any suggestion ?
Thanks.

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[JSF 2] Update the total of an editable column from a dataTable

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