flutter_multiselect 0.2.0

Flutter package for multi-select UI widget, that compatible to both iOS and Android and uses neutral design.

example/lib/main.dart

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo - Multiselect'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  final GlobalKey<FormState> _formKey = new GlobalKey<FormState>();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: new Form(
          key: _formKey,
          autovalidate: true,
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              new MultiSelect(
                  autovalidate: false,
                  titleText: 'Country of Residence',
                  validator: (value) {
                    if (value == null) {
                      return 'Please select one or more option(s)2';
                    }
                  },
                  errorText: 'Please select one or more option(s)1',
                  dataSource: [
                    {
                      "display": "Australia",
                      "value": 1,
                    },
                    {
                      "display": "Canada",
                      "value": 2,
                    },
                    {
                      "display": "India",
                      "value": 3,
                    },
                    {
                      "display": "United States",
                      "value": 4,
                    }
                  ],
                  textField: 'display',
                  valueField: 'value',
                  filterable: true,
                  required: true,
                  onSaved: (value) {
                    print('The value is $value');
                  }),
              SizedBox(
                width: 10.0,
              ),
              RaisedButton(
                child: Text('Save'),
                color: Colors.white,
                onPressed: () {
                  _onFormSaved();
                },
              )
            ],
          ),
        ),
      ),
      // This trailing comma makes auto-formatting nicer for build methods.
    );
  }

  void _onFormSaved() {
    final FormState form = _formKey.currentState;
    form.save();
  }
}