Datatable filtered sum total column

[vitoco]

Hello, I have a datatable PrimeFaces problem. I want to calculate the total value of a column using the PF filter ('widgervar'). filter () works perfectly. but I can not add up the total value of the column when the table is filtered.

Code: Select all

public float getValorneto() {
        float valor_neto = 0.0f;
        for (Detallepre d : tbldetallepresupuesto) {
            valor_neto += (d.getRedimiento() * d.getPrecioUnitario());
        }
        return valor_neto;
    }

I can only add up the total value but entire table unfiltered there any way
and filtered through the table to perform the calculations.

Thank You.