How to change data in multiple cells?

Question

JavaScript

Hello.
Please explain how this table works , I need to do the same.
Namely interests how to implement that having changed value of one cell, the data in other cells exchanged.
If it is important, formulas for calculation will come along with the REST data.

Answer 1

document.querySelectorAll('td input').forEach(function(field) {
    field.addEventListener('change', function() {
        /* Какая-то функция для пересчета данных */
    })
})

Answer 2

Namely interests how to implement that having changed value of one cell, the data in other cells exchanged.

Create a Redux store, shove your table model there in a normalized form, write actions that trigger on changing the value in the cells, write a reducer that will change the model accordingly. Profit.