How to Add a Computed Column to Flutter DataTable?

In this article, we will show you how to add a computed column to a Flutter DataTable.

Initialize the SfDataGrid widget with all the required properties. Create a model class that includes the necessary properties, along with a computed property using a getter. This computed property does not store data directly; instead, it calculates and returns values based on other properties of the class. Additionally, you need to specify the columns in DataGrid, including the computed column.

 @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Syncfusion Flutter DataGrid'),
      ),
      body: SfDataGrid(
        source: employeeDataSource,
        columnWidthMode: ColumnWidthMode.fill,
        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(16.0),
              alignment: Alignment.center,
              child: const Text('Name'),
            ),
          ),
          GridColumn(
            columnName: 'credit',
            label: Container(
              padding: const EdgeInsets.all(16.0),
              alignment: Alignment.center,
              child: const Text('Credit'),
            ),
          ),
          GridColumn(
            columnName: 'debit',
            label: Container(
              padding: const EdgeInsets.all(16.0),
              alignment: Alignment.center,
              child: const Text('Debit'),
            ),
          ),
          GridColumn(
            columnName: 'balance',
            label: Container(
              padding: const EdgeInsets.all(16.0),
              alignment: Alignment.center,
              child: const Text('Balance'),
            ),
          ),
        ],
      ),
    );
  }

class Employee {
  Employee(this.id, this.name, this.credit, this.debit);

  final int id;
  final String name;
  final double credit;
  final double debit;

  double get balance => credit - debit; // Computed balance
}

View the GitHub sample here.

Conclusion
I hope you enjoyed learning how to add a computed column to 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.
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