Mini Shell

document.addEventListener("DOMContentLoaded", function() {
    function isEmptyRow(instance, row) {
        for (var rowData = instance.getData()[row], i = 0, ilen = rowData.length; i < ilen; i++)
            if (null !== rowData[i]) return !1;
        return !0
    }

    function defaultValueRenderer(instance, td, row, col, prop, value, cellProperties) {
        var args = arguments;
        null === args[5] && isEmptyRow(instance, row) ? (args[5] = tpl[col], td.style.color = "#999") : td.style.color = "", Handsontable.renderers.TextRenderer.apply(this, args)
    }
    var hot1, tpl = ["one", "two", "three"],
        data = [
            ["", "Kia", "Nissan", "Toyota", "Honda"],
            ["2014", 10, 11, 12, 13],
            ["2015", 20, 11, 14, 13],
            ["2016", 30, 15, 12, 13]
        ],
        container = document.getElementById("populating");
    hot1 = new Handsontable(container, {
        startRows: 8,
        startCols: 5,
        minSpareRows: 1,
        contextMenu: !0,
        cells: function(row, col, prop) {
            var cellProperties = {};
            return cellProperties.renderer = defaultValueRenderer, cellProperties
        },
        beforeChange: function(changes) {
            var i, c, instance = hot1,
                ilen = changes.length,
                clen = instance.colCount,
                rowColumnSeen = {},
                rowsToFill = {};
            for (i = 0; i < ilen; i++) null === changes[i][2] && null !== changes[i][3] && isEmptyRow(instance, changes[i][0]) && (rowColumnSeen[changes[i][0] + "/" + changes[i][1]] = !0, rowsToFill[changes[i][0]] = !0);
            for (var r in rowsToFill)
                if (rowsToFill.hasOwnProperty(r))
                    for (c = 0; c < clen; c++) rowColumnSeen[r + "/" + c] || changes.push([r, c, null, tpl[c]])
        }
    }), hot1.loadData(data)
});