I have a grid that uses javascript to perform calculations on the group total rows as described in other posts, to properly calculate certain earned value metrics fields, including percent complete and PF:

When exporting the grid to excel, or using the copy/paste functionality, the basic summed values are exported/copied rather than the updated values:

The formatting changes that are made through the same javascript are exporting properly:

    // SampleGridFunctions.aggregatePF
    // panel: https://demos.wijmo.com/5/Angular/WijmoHelp/WijmoHelp/topic/wijmo.grid.GridPanel.Class.html
    // row: index of the row
    // column: index of the column
    // cell: HTMLElement
    aggregatePF: function(panel, row, column, cell) {
        var _column = panel.columns[column];
        var _row = panel.rows[row];
        var _binding = _column.binding;
        var _item = _row.dataItem;
        var group = _row instanceof wijmo.grid.GroupRow ? _item : null;
        var itemPF = _item.PF;
        var _class = '';
        
        if (_binding == 'PF' && _item !==undefined)  {
            var amount = group
                ? group.getAggregate('Sum', 'Earned') / group.getAggregate('Sum', 'Actual')
                : itemPF;
  
                if (isNaN(amount) || !isFinite(amount)) {
                    amount = '';
                }
                
                cell.textContent = wijmo.Globalize.format(amount);
                if (amount <= 0.95) {
                    _class = 'font-red-threshold';
                    wijmo.addClass(cell, _class);
                }
        }
    
        if (itemPF <= 0.95) {
            _class = 'font-red-threshold';
            wijmo.addClass(cell, _class);
        }            
  
    },

Thanks,

Coy Kissee