How to display row indexes like Excel in Flutter DataTable?

In this article, we will show you how to display row indexes like Excel in Flutter DataTable.

Initialize the SfDataGrid widget with all the required properties. you can display indexes ranging from 1 to the visible row count by creating a separate column as the first column to show the count of rows. In the buildRow method, add the respective index to the first column by utilizing the effective rows collection. Obtaining the index from the effective rows ensures it ranges from 1 to the visible row count, even when filtering or sorting is applied.

class EmployeeDataSource extends DataGridSource {
…

  @override
  DataGridRowAdapter buildRow(DataGridRow row) {
    return DataGridRowAdapter(
        cells: row.getCells().map<Widget>((dataGridCell) {
      return Container(
        alignment: Alignment.center,
        padding: const EdgeInsets.symmetric(horizontal: 8.0),
        child: dataGridCell.columnName == 'Index'
            ? getSerialNumber(row)
            : Text(dataGridCell.value.toString()),
      );
    }).toList());
  }

  Text getSerialNumber(DataGridRow row) {
    // Get the index of the current row
    // Add header count to the index, here 1 is added
    int serialNumber = effectiveRows.indexOf(row) + 1;
    return Text((serialNumber.toString()));
  }
}

You can download this example on GitHub.