clearFilters method Null safety

void clearFilters(
  1. {String? columnName}
)

Clear the FilterCondition from a given column or clear all the filter conditions from all the columns.

Pass the required columnName to remove the filter conditions from the specific column.

@override
Widget build(BuildContext context) {
  return Column(
    children: [
      Expanded(
        child: SfDataGrid(source: _employeeDataSource, columns: [
          GridColumn(columnName: 'id', label: Text('ID')),
          GridColumn(columnName: 'name', label: Text('Name')),
          GridColumn(columnName: 'designation', label: Text('Designation')),
          GridColumn(columnName: 'salary', label: Text('Salary')),
        ]),
      ),
      MaterialButton(
          child: Text('Clear Filters'),
          onPressed: () {
            _employeeDataSource.clearFilters();
          }),
    ],
  );
}

Implementation

void clearFilters({String? columnName}) {
  if (_filterConditions.isNotEmpty) {
    if (columnName != null && _filterConditions.containsKey(columnName)) {
      _filterConditions.remove(columnName);
      if (_dataGridStateDetails != null) {
        _refreshFilter(_dataGridStateDetails!());
      }
    } else if (columnName == null) {
      _filterConditions.clear();
      if (_dataGridStateDetails != null) {
        _refreshFilter(_dataGridStateDetails!());
      }
    }
  }
}