I have similar code:

<script>

$(document).ready(function () {

    var data = @Html.Raw(ViewBag.Data);



function sumPreviousValues(instance, td, row, col, prop, value, cellProperties) {

  Handsontable.renderers.TextRenderer.apply(this, arguments);

    td.val = 'SUM SEVERAL PREVIOUS CELLS';

}



     container = document.getElementById('example1'),

      settings1 = {

        data: data,

        colHeaders: @Html.Raw(ViewBag.TableHeader),

        cells: function (row, col, prop) {

            var cellProperties = {};



            if (col == 16) {

                cellProperties.renderer = sumPreviousValues;

            }

    return cellProperties;

        }

      },



    hot = new Handsontable(container,settings1);

    hot.render();

The key is to modify the function sumPreviousValues()

But I dont know how to access the td value ? and if it is possible to access other cells' value like td[index].
Any idea? I didn't find options in documentation.

Thank you