How to Show a Popup When Reselecting a Row in Flutter DataTable?

In this article, we will show you how to show a popup when reselecting a row in Flutter DataTable.

Initialize the SfDataGrid with the necessary properties. Use a DataGridController to track selected rows via DataGridController.selectedRows. Handle the onCellTap callback to detect when a cell is tapped. If a row is already selected, extract its cell values and display them in a popup (AlertDialog).

SfDataGrid(
        source: employeeDataSource,
        selectionMode: SelectionMode.single,
        navigationMode: GridNavigationMode.cell,
        columnWidthMode: ColumnWidthMode.fill,
        controller: dataGridController,
        onCellTap: (details) {
          final rowIndex = details.rowColumnIndex.rowIndex;
          if (rowIndex > 0) {
            final selectedRow = employeeDataSource.effectiveRows[rowIndex - 1];

            if (dataGridController.selectedRows.contains(selectedRow)) {
              final cellValues = selectedRow
                  .getCells()
                  .map((cell) => cell.value.toString())
                  .toList();
              final labels = [
                'Employee ID',
                'Employee Name',
                'Designation',
                'Salary'
              ];

              showDialog(
                context: context,
                builder: (context) => AlertDialog(
                  shape: const RoundedRectangleBorder(
                    borderRadius: BorderRadius.all(Radius.circular(32.0)),
                  ),
                  content: SizedBox(
                    height: 300,
                    width: 300,
                    child: Column(
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      children: [
                        ...List.generate(labels.length, (index) {
                          return Row(
                            children: [
                              Text(labels[index]),
                              const SizedBox(width: 10),
                              const Text(':'),
                              const SizedBox(width: 10),
                              Text(cellValues[index]),
                            ],
                          );
                        }),
                        SizedBox(
                          width: 300,
                          child: ElevatedButton(
                            onPressed: () => Navigator.pop(context),
                            child: const Text("OK"),
                          ),
                        ),
                      ],
                    ),
                  ),
                ),
              );
            }
          }
        },
        columns: <GridColumn>[
          GridColumn(
              columnName: 'id',
              label: Container(
                  padding: EdgeInsets.all(16.0),
                  alignment: Alignment.center,
                  child: Text(
                    'ID',
                  ))),
          GridColumn(
              columnName: 'name',
              label: Container(
                  padding: EdgeInsets.all(8.0),
                  alignment: Alignment.center,
                  child: Text('Name'))),
          GridColumn(
              columnName: 'designation',
              label: Container(
                  padding: EdgeInsets.all(8.0),
                  alignment: Alignment.center,
                  child: Text(
                    'Designation',
                    overflow: TextOverflow.ellipsis,
                  ))),
          GridColumn(
              columnName: 'salary',
              label: Container(
                  padding: EdgeInsets.all(8.0),
                  alignment: Alignment.center,
                  child: Text('Salary'))),
    ],
),

You can download this example on GitHub.

**Conclusion
I hope you enjoyed learning how to show a popup when reselecting a row in Flutter DataTable.

You can refer to our Flutter Data Table 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 Flutter Data Table Example to understand how to create and manipulate data.
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