flutter

// Copyright 2018 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:http/http.dart' as http;
import 'dart:convert' show jsonEncode;

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => new _MyAppState();
}

class _MyAppState extends State<MyApp> {


  String _number = '';
  String _comment = '';
  String _question1 = 'true';
  String _question2 = 'true';
  String _question3 = 'true';
  String _question4 = 'true';

  void _setQuestion1(String value) => setState(() => _question1 = value);
  void _setQuestion2(String value) => setState(() => _question2 = value);
  void _setQuestion3(String value) => setState(() => _question3 = value);
  void _setQuestion4(String value) => setState(() => _question4 = value);
  final _formKey = GlobalKey<FormState>();

  Future<http.Response> sendRequest() {
    return http.post(
      'https://web.kern-info.eu/test.cgi',
      headers: <String, String>{
        'Content-Type': 'application/json; charset=UTF-8',
      },
      body: jsonEncode(<String, String>{
        'number': _number,
        'question1': _question1,
        'question2': _question2,
        'question3': _question3,
        'question4': _question4,
        'comment': _comment,

      }),
    );
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: new Scaffold(
            resizeToAvoidBottomInset: false, // set it to false
            appBar: AppBar(
              title: new Text('Survey'),
              centerTitle: true,
              backgroundColor: Colors.blue,
            ),
            body: new Form (
              key: _formKey,
                child: new Column(
                  children: <Widget>[
                    new TextField(
                      decoration: new InputDecoration(labelText: "Enter number"),
                      keyboardType: TextInputType.number,
                      inputFormatters: <TextInputFormatter>[
                        WhitelistingTextInputFormatter.digitsOnly
                      ], // Only numbers can be entered
                      onChanged: (value) { _number = value; },
                    ),
                    new Text('Question 1',
                        style: new TextStyle(fontWeight: FontWeight.bold)),
                    new Row(mainAxisAlignment: MainAxisAlignment.center,
                        children: <Widget>[
                          new Radio(value: "true",
                              groupValue: _question1,
                              onChanged: _setQuestion1),
                          new Text('Yes'),
                          new Radio(value: "false",
                              groupValue: _question1,
                              onChanged: _setQuestion1),
                          new Text('No'),
                        ]
                    ),
                    new Text('Question 2',
                        style: new TextStyle(fontWeight: FontWeight.bold)),
                    new Row(mainAxisAlignment: MainAxisAlignment.center,
                        children: <Widget>[
                          new Radio(value: 'true',
                              groupValue: _question2,
                              onChanged: _setQuestion2),
                          new Text('Yes'),
                          new Radio(value: 'false',
                              groupValue: _question2,
                              onChanged: _setQuestion2),
                          new Text('No'),
                        ]
                    ),
                    new Text('Question 3',
                        style: new TextStyle(fontWeight: FontWeight.bold)),
                    new Row(mainAxisAlignment: MainAxisAlignment.center,
                        children: <Widget>[
                          new Radio(value: 'true',
                              groupValue: _question3,
                              onChanged: _setQuestion3),
                          new Text('Yes'),
                          new Radio(value: 'false',
                              groupValue: _question3,
                              onChanged: _setQuestion3),
                          new Text('No'),
                        ]
                    ),
                    new Text('Question 4',
                        style: new TextStyle(fontWeight: FontWeight.bold)),
                    new Row(mainAxisAlignment: MainAxisAlignment.center,
                        children: <Widget>[
                          new Radio(value: 'true',
                              groupValue: _question4,
                              onChanged: _setQuestion4),
                          new Text('Yes'),
                          new Radio(value: 'false',
                              groupValue: _question4,
                              onChanged: _setQuestion4),
                          new Text('No'),
                        ]
                    ),
                    new Text('Free Comment',
                        style: new TextStyle(fontWeight: FontWeight.bold)),
                    new TextField(
                        decoration: InputDecoration(
                            border: OutlineInputBorder(),
                            labelText: 'Insert Comment',
                        ),
                        onChanged: (value) { _comment = value; },
                    ),
                    new Padding(
                      padding: const EdgeInsets.symmetric(vertical: 16.0),
                      child: new RaisedButton(
                        onPressed: () {
                          sendRequest();
                        },
                        child: Text('Submit'),
                      ),
                    ),
                  ],
                )
            )
            )
        );
  }
}