How to Get Selected Rows Apart from Filtering in Flutter DataTable?

In this article, we will show you how to get total selected rows apart from filtering in Flutter DataTable.

Initialize the SfDataGrid with the necessary properties. Maintain a flag list to track selected rows. Use the onSelectionChanged event to add or remove rows from this list as they are selected or deselected. This callback is triggered after a row is selected. By accessing the list, you can retrieve the total number of selected rows, even after filtering.

@override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Syncfusion Flutter DataGrid')),
      body: Column(
        children: [
          TextButton(
            child: const Text('Total selected rows'),
            onPressed: () {
              // Get total selected rows by accessing the flag list.
              showDialog(
                context: context,
                builder: (BuildContext context) {
                  return AlertDialog(
                    title: const Text('Selected Rows'),
                    content: Text(
                      'Total selected rows: ${selectedRows.length}',
                    ),
                    actions: [
                      TextButton(
                        onPressed: () {
                          Navigator.of(context).pop();
                        },
                        child: const Text('OK'),
                      ),
                    ],
                  );
                },
              );
            },
          ),
          Expanded(
            child: SfDataGrid(
              controller: dataGridController,
              source: employeeDataSource,
              allowFiltering: true,
              selectionMode: SelectionMode.multiple,
              columnWidthMode: ColumnWidthMode.fill,
              onSelectionChanged: (addedRows, removedRows) {
                // Add rows if not already in selectedRows.
                selectedRows.addAll(
                  addedRows.where((row) => !selectedRows.contains(row)),
                );

                // Remove rows if they exist in selectedRows.
                selectedRows.removeWhere((row) => removedRows.contains(row));
              },
              columns: <GridColumn>[
                GridColumn(
                  columnName: 'id',
                  label: Container(
                    padding: const EdgeInsets.all(16.0),
                    alignment: Alignment.center,
                    child: const Text('ID'),
                  ),
                ),
                GridColumn(
                  columnName: 'name',
                  label: Container(
                    padding: const EdgeInsets.all(8.0),
                    alignment: Alignment.center,
                    child: const Text('Name'),
                  ),
                ),
                GridColumn(
                  columnName: 'designation',
                  label: Container(
                    padding: const EdgeInsets.all(8.0),
                    alignment: Alignment.center,
                    child: const Text(
                      'Designation',
                      overflow: TextOverflow.ellipsis,
                    ),
                  ),
                ),
                GridColumn(
                  columnName: 'salary',
                  label: Container(
                    padding: const EdgeInsets.all(8.0),
                    alignment: Alignment.center,
                    child: const Text('Salary'),
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

You can download this example on GitHub.

Conclusion
I hope you enjoyed learning how to get selected rows apart from filtering in Flutter DataTable.
You can refer to our Flutter DataGrid feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our Flatter DataGrid example to understand how to create and manipulate data.
For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our other controls.
If you have any queries or require clarifications, please let us know in the comments section below. You can also contact us through our support forums, Direct-Trac, or feedback portal. We are always happy to assist you!