Flutter DataTable - How to add DataRow (without repeating HeaderRow) on button click(tap)?

Question

I have the following code that runs fine for creating a DataTable on button press, except that the logic creates another table where I just want to add a DataRow.

List<Widget> _datatableList = [];
...
  void _addDataTableWidget() {
setState(() {
  _datatableList.add(_buildEmptyDataTable());
});
}

On Tap:

_addDataTableWidget();

DataTable:

 _buildEmptyDataTable(){
 return
  DataTable(

    columns: const [

      DataColumn(
        label: Text(
          "Weight",
          style: TextStyle(
            fontStyle: FontStyle.italic,
            color: kBlack,
          ),
        ),
        numeric: true,
        
      ),
      DataColumn(
        label: Text(
          "Reps",
          style: TextStyle(
            fontStyle: FontStyle.italic,
            color: kBlack,
          ),
        ),
        numeric: true,
      ),

    ],
    rows: sets
        .map(
          (sets) => DataRow(cells: [              
            DataCell(Text(weightController.text)),
            DataCell(Text(repsController.text)),
          ]),
        )
        .toList(),
  ),
}

How do I add just the next datarows on button click?

Answer 1

Instead of creating DataTable on click, you can handle by checking if rows contains data or not. and add row on click event.

  List<DataRow> dataRows = [];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        children: [
          TextField(
            controller: weightController,
          ),
          TextField(
            controller: repsController,
          ),
          if (dataRows.isNotEmpty)
            DataTable(
              columns: const [
                DataColumn(
                  label: Text(
                    "Weight",
                    style: TextStyle(
                      fontStyle: FontStyle.italic,
                      // color: kBlack,
                    ),
                  ),
                  numeric: true,
                ),
                DataColumn(
                  label: Text(
                    "Reps",
                    style: TextStyle(
                      fontStyle: FontStyle.italic,
                      color: Colors.black,
                    ),
                  ),
                  numeric: true,
                ),
              ],
              rows: dataRows,
            ),
        ],
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          setState(() {
            dataRows.add(DataRow(cells: [
              DataCell(Text(weightController.text)),
              DataCell(Text(repsController.text)),
            ]));
          });
        },
      ),
    );
  }
}