Example of sortable DataTable in Flutter

The example below shows you how to implement a sortable table in Flutter by using the DataTable widget.

Preview

This sample app contains a DataTable which displays a list of fiction products. In the beginning, the products are sorted in ascending ID order. However, the user can sort them in ascending or descending price order by touching the heading of the price column, as shown in the following screen capture:Advertisements

The code

The full code in main.dart with explanations:

import 'package:flutter/material.dart';
import 'dart:math';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Kindacode.com',
      home: HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  const HomePage({Key? key}) : super(key: key);

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  // Generate a list of fiction prodcts
  final List<Map> _products = List.generate(30, (i) {
    return {"id": i, "name": "Product $i", "price": Random().nextInt(200) + 1};
  });

  int _currentSortColumn = 0;
  bool _isAscending = true;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: const Text('Kindacode.com'),
        ),
        body: SizedBox(
          width: double.infinity,
          child: SingleChildScrollView(
            child: DataTable(
              sortColumnIndex: _currentSortColumn,
              sortAscending: _isAscending,
              headingRowColor: MaterialStateProperty.all(Colors.amber[200]),
              columns: [
                const DataColumn(label: Text('Id')),
                const DataColumn(label: Text('Name')),
                DataColumn(
                    label: const Text(
                      'Price',
                      style: TextStyle(
                          color: Colors.blue, fontWeight: FontWeight.bold),
                    ),
                    // Sorting function
                    onSort: (columnIndex, _) {
                      setState(() {
                        _currentSortColumn = columnIndex;
                        if (_isAscending == true) {
                          _isAscending = false;
                          // sort the product list in Ascending, order by Price
                          _products.sort((productA, productB) =>
                              productB['price'].compareTo(productA['price']));
                        } else {
                          _isAscending = true;
                          // sort the product list in Descending, order by Price
                          _products.sort((productA, productB) =>
                              productA['price'].compareTo(productB['price']));
                        }
                      });
                    }),
              ],
              rows: _products.map((item) {
                return DataRow(cells: [
                  DataCell(Text(item['id'].toString())),
                  DataCell(Text(item['name'])),
                  DataCell(Text(item['price'].toString()))
                ]);
              }).toList(),
            ),
          ),
        ));
  }
}

Hope this example can help you a little. Besides DataTable, Flutter also provides a couple of other widgets to implement tables:

• Flutter PaginatedDataTable Example
• Working with Table in Flutter

If you would like to learn more about Flutter, take a look at the following articles: 5 Ways to Store Data Offline in Flutter – Flutter SliverAppBar Example (with Explanations) – 2 ways to remove duplicate items from a list in Dart – Dart regular expression to check people’s names – Flutter & Dart Regular Expression Examples.

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