How to pass the data from the form to the next screen in flutter? - flutter

Question

I'm building an application that has a pretty long form with a lot of text fields, so I divided the text fields into multiple screens. It got three screens, the first screen has some common text fields such as phone, website, email, etc. The second screen has some more text fields and the same with the third screen. I'm trying to display all the details from the three forms at the end on a different screen.
I want to display all the details in the end when I hit the 'Done' button on a different page.
Here's the code for the first screen which has the first form:-
import 'package:flutter/material.dart';
import 'package:instaskool/model.dart';
import 'package:validators/validators.dart' as validator;
import 'package:instaskool/home_screens/homescreen_student.dart';
import 'package:instaskool/home_screens/homescreen_school.dart';
import 'package:instaskool/screens/school_signup_two.dart';
class SchoolReg extends StatefulWidget {
#override
_SchoolRegState createState() => _SchoolRegState();
}
class _SchoolRegState extends State<SchoolReg> {
final _formKey = GlobalKey<FormState>();
School school = School();
#override
Widget build(BuildContext context) {
return Scaffold(
body: SingleChildScrollView(
child: new Form(
key: _formKey,
child: Column(
children: <Widget>[
Container(
margin: EdgeInsets.only(top: 130),
alignment: Alignment.topCenter,
child: MyTextFormField(
hintText: 'School name',
validator: (String value) {
if (value.isEmpty) {
return 'Enter your school name';
}
return null;
},
onSaved: (String value) {
school.schoolName = value;
},
),
),
MyTextFormField(
hintText: 'Phone',
validator: (String value) {
if (value.isEmpty) {
return 'Enter the phone number';
}
return null;
},
onSaved: (String value) {
school.schoolPhone = value;
},
),
MyTextFormField(
hintText: 'Email',
validator: (String value) {
if (value.isEmpty) {
return 'Enter the email address';
}
return null;
},
onSaved: (String value) {
school.schoolEmail = value;
},
),
MyTextFormField(
hintText: 'School Website',
isEmail: true,
validator: (String value) {
if (value.isEmpty) {
return "Enter the school's website";
}
return null;
},
onSaved: (String value) {
school.schoolWebsite = value;
},
),
RaisedButton(
color: Colors.blueAccent,
onPressed: () {
if (_formKey.currentState.validate()) {
_formKey.currentState.save();
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => SchoolRegTwo()));
}
},
child: Text(
'Next',
style: TextStyle(
color: Colors.white,
),
),
)
],
),
),
),
);
}
}
class MyTextFormField extends StatelessWidget {
final String hintText;
final Function validator;
final Function onSaved;
final bool isPassword;
final bool isEmail;
MyTextFormField({
this.hintText,
this.validator,
this.onSaved,
this.isPassword = false,
this.isEmail = false,
});
#override
Widget build(BuildContext context) {
return Padding(
padding: EdgeInsets.all(8.0),
child: TextFormField(
decoration: InputDecoration(
hintText: hintText,
contentPadding: EdgeInsets.all(15.0),
border: InputBorder.none,
filled: true,
fillColor: Colors.grey[200],
),
obscureText: isPassword ? true : false,
validator: validator,
onSaved: onSaved,
keyboardType: isEmail ? TextInputType.emailAddress : TextInputType.text,
),
);
}
}
Here's the code for the second form:-
import 'package:flutter/material.dart';
import 'package:instaskool/model.dart';
import 'package:validators/validators.dart' as validator;
import 'package:instaskool/home_screens/homescreen_student.dart';
import 'package:instaskool/home_screens/homescreen_school.dart';
import 'package:instaskool/screens/school_signup_three.dart';
class SchoolRegTwo extends StatefulWidget {
#override
_SchoolRegTwoState createState() => _SchoolRegTwoState();
}
class _SchoolRegTwoState extends State<SchoolRegTwo> {
final _formKey = GlobalKey<FormState>();
SchoolDet schooldet = SchoolDet();
#override
Widget build(BuildContext context) {
return Scaffold(
body: SingleChildScrollView(
child: new Form(
key: _formKey,
child: Column(
children: <Widget>[
Container(
margin: EdgeInsets.only(top: 130),
alignment: Alignment.topCenter,
child: MyTextFormField(
hintText: 'School address 1',
validator: (String value) {
if (value.isEmpty) {
return "Enter your school's address";
}
return null;
},
onSaved: (String value) {
schooldet.addressOne = value;
},
),
),
MyTextFormField(
hintText: 'School address 2',
validator: (String value) {
if (value.isEmpty) {
return "Enter the school's address";
}
return null;
},
onSaved: (String value) {
schooldet.addressTwo = value;
},
),
MyTextFormField(
hintText: 'City',
validator: (String value) {
if (value.isEmpty) {
return 'Enter the city';
}
return null;
},
onSaved: (String value) {
schooldet.city = value;
},
),
MyTextFormField(
hintText: 'Pincode',
isEmail: true,
validator: (String value) {
if (value.isEmpty) {
return "Enter the pincode";
}
return null;
},
onSaved: (String value) {
schooldet.pincode = value;
},
),
MyTextFormField(
hintText: 'State',
isEmail: true,
validator: (String value) {
if (value.isEmpty) {
return "Enter the state";
}
return null;
},
onSaved: (String value) {
schooldet.state = value;
},
),
RaisedButton(
color: Colors.blueAccent,
onPressed: () {
if (_formKey.currentState.validate()) {
_formKey.currentState.save();
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => SchoolRegThree(schooldet: this.schooldet)));
}
},
child: Text(
'Next',
style: TextStyle(
color: Colors.white,
),
),
)
],
),
),
),
);
}
}
class MyTextFormField extends StatelessWidget {
final String hintText;
final Function validator;
final Function onSaved;
final bool isPassword;
final bool isEmail;
MyTextFormField({
this.hintText,
this.validator,
this.onSaved,
this.isPassword = false,
this.isEmail = false,
});
#override
Widget build(BuildContext context) {
return Padding(
padding: EdgeInsets.all(8.0),
child: TextFormField(
decoration: InputDecoration(
hintText: hintText,
contentPadding: EdgeInsets.all(15.0),
border: InputBorder.none,
filled: true,
fillColor: Colors.grey[200],
),
obscureText: isPassword ? true : false,
validator: validator,
onSaved: onSaved,
keyboardType: isEmail ? TextInputType.emailAddress : TextInputType.text,
),
);
}
}
Here's the code for the third form:-
import 'package:flutter/material.dart';
import 'package:instaskool/model.dart';
import 'package:validators/validators.dart' as validator;
import 'package:instaskool/home_screens/homescreen_student.dart';
import 'package:instaskool/home_screens/homescreen_school.dart';
import 'package:instaskool/screens/school_signup_three.dart';
import 'package:instaskool/screens/school_code.dart';
class SchoolRegThree extends StatefulWidget {
School school;
SchoolRegThree({this.school, SchoolDet schooldet});
#override
_SchoolRegThreeState createState() => _SchoolRegThreeState();
}
class _SchoolRegThreeState extends State<SchoolRegThree> {
final _formKey = GlobalKey<FormState>();
SchoolUser schooluser = SchoolUser();
#override
Widget build(BuildContext context) {
return Scaffold(
body: SingleChildScrollView(
child: new Form(
key: _formKey,
child: Column(
children: <Widget>[
Container(
margin: EdgeInsets.only(top: 100),
child: MyTextFormField(
hintText: 'Username',
isPassword: true,
validator: (String value) {
if (value.length < 5) {
return 'Username should be at least 5 characters long';
}
_formKey.currentState.save();
return null;
},
onSaved: (String value) {
schooluser.username = value;
},
),
),
MyTextFormField(
hintText: 'New Password',
isPassword: true,
validator: (String value) {
if (value.length < 7) {
return 'Password should be at least 7 characters long';
} else if (schooluser.password != null) {
print(value);
print(schooluser.password);
}
return null;
},
onSaved: (String value) {
schooluser.password = value;
},
),
RaisedButton(
color: Colors.blueAccent,
onPressed: () {
if (_formKey.currentState.validate()) {
_formKey.currentState.save();
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => ResultSchool(schooluser: this.schooluser)));
}
},
child: Text(
'Done',
style: TextStyle(
color: Colors.white,
),
),
)
],
),
),
),
);
}
}
class MyTextFormField extends StatelessWidget {
final String hintText;
final Function validator;
final Function onSaved;
final bool isPassword;
final bool isEmail;
MyTextFormField({
this.hintText,
this.validator,
this.onSaved,
this.isPassword = false,
this.isEmail = false,
});
#override
Widget build(BuildContext context) {
return Padding(
padding: EdgeInsets.all(8.0),
child: TextFormField(
decoration: InputDecoration(
hintText: hintText,
contentPadding: EdgeInsets.all(15.0),
border: InputBorder.none,
filled: true,
fillColor: Colors.grey[200],
),
obscureText: isPassword ? true : false,
validator: validator,
onSaved: onSaved,
keyboardType: isEmail ? TextInputType.emailAddress : TextInputType.text,
),
);
}
}
Here's the model.dart which has all the variables:-
import 'package:flutter/material.dart';
import 'package:instaskool/screens/school_code.dart';
class Model {
String fullname;
String code;
String standard;
String section;
String username;
String password;
Model({this.fullname, this.code, this.standard, this.section, this.username, this.password});
}
class School {
String schoolName;
String schoolPhone;
String schoolEmail;
String schoolWebsite;
School({this.schoolName, this.schoolPhone, this.schoolEmail, this.schoolWebsite});
}
class SchoolDet {
String addressOne;
String addressTwo;
String city;
String pincode;
String state;
SchoolDet({this.addressOne, this.addressTwo, this.city, this.pincode, this.state});
}
class SchoolUser{
String username;
String password;
SchoolUser({this.username, this.password});
}
class SchoolCode{
String principalCode;
String teacherCode;
String studentCode;
SchoolCode({this.principalCode, this.teacherCode, this.studentCode});
}
Here's the result screen where I wanna display all the data:-
import 'package:flutter/material.dart';
import 'package:instaskool/model.dart';
class ResultSchool extends StatelessWidget {
School school;
SchoolDet schooldet;
SchoolCode schoolcode;
SchoolUser schooluser;
ResultSchool({this.school, this.schooldet, this.schooluser});
#override
Widget build(BuildContext context) {
return (Scaffold(
appBar: AppBar(title: Text('School details')),
body: Container(
margin: EdgeInsets.all(10.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(school.schoolName, style: TextStyle(fontSize: 22)),
Text(school.schoolPhone, style: TextStyle(fontSize: 22)),
Text(school.schoolEmail, style: TextStyle(fontSize: 22)),
Text(school.schoolWebsite, style: TextStyle(fontSize: 22)),
Text(schooldet.addressOne, style: TextStyle(fontSize: 22)),
Text(schooldet.addressTwo, style: TextStyle(fontSize: 22)),
Text(schooldet.city, style: TextStyle(fontSize: 22)),
Text(schooldet.pincode, style: TextStyle(fontSize: 22)),
Text(schooldet.state, style: TextStyle(fontSize: 22)),
Text(schooluser.username, style: TextStyle(fontSize: 22)),
Text(schooluser.password, style: TextStyle(fontSize: 22)),
Text(schoolcode.teacherCode, style: TextStyle(fontSize: 22)),
Text(schoolcode.principalCode, style: TextStyle(fontSize: 22)),
],
),
),
));
}
}

Answer 1

Add a widget to manage form transitions
enum SchoolFormPhase { BASIC_DTL, ADDRESS, USER_DTL }
class SchoolRegistration extends StatefulWidget {
#override
_SchoolRegistrationState createState() => _SchoolRegistrationState();
}
class _SchoolRegistrationState extends State<SchoolRegistration> {
SchoolFormPhase phase;
School schoolForm;
#override
void initState() {
phase = SchoolFormPhase.BASIC_DTL;
schoolForm = School();
super.initState();
}
#override
Widget build(BuildContext context) {
switch (phase) {
case SchoolFormPhase.BASIC_DTL:
return SchoolReg(
school: schoolForm,
onSaved: (school) {
setState(() {
schoolForm = school;
phase = SchoolFormPhase.ADDRESS;
});
});
case SchoolFormPhase.ADDRESS:
return SchoolRegTwo(
school: schoolForm,
onSaved: (school) {
setState(() {
schoolForm = school;
phase = SchoolFormPhase.USER_DTL;
});
});
case SchoolFormPhase.USER_DTL:
return SchoolRegThree(
school: schoolForm,
onSaved: (school) {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => ResultSchool(
schooluser: school.user,
school: school,
schooldet: school.address)));
},
);
}
return Container();
}
}
change the Form widget to accept inputs
class SchoolReg extends StatefulWidget {
final School school;
final Function(School) onSaved;
const SchoolReg({Key key, this.school, this.onSaved}) : super(key: key);
#override
_SchoolRegState createState() => _SchoolRegState();
}
class _SchoolRegState extends State<SchoolReg> {
final _formKey = GlobalKey<FormState>();
School _school;
#override
void initState() {
_school = widget.school;
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: SingleChildScrollView(
child: new Form(
key: _formKey,
child: Column(children: <Widget>[
Container(
margin: EdgeInsets.only(top: 130),
alignment: Alignment.topCenter,
child: MyTextFormField(
hintText: 'School name',
validator: (String value) {
return value.isEmpty
? 'Enter your school name'
: null;
},
onSaved: (value) => _school.schoolName = value)),
MyTextFormField(
hintText: 'Phone',
validator: (String value) {
if (value.isEmpty) {
return 'Enter the phone number';
}
return null;
},
onSaved: (String value) {
_school.schoolPhone = value;
},
),
MyTextFormField(
hintText: 'Email',
validator: (String value) {
if (value.isEmpty) {
return 'Enter the email address';
}
return null;
},
onSaved: (String value) {
_school.schoolEmail = value;
},
),
MyTextFormField(
hintText: 'School Website',
isEmail: true,
validator: (String value) {
if (value.isEmpty) {
return "Enter the school's website";
}
return null;
},
onSaved: (String value) {
_school.schoolWebsite = value;
},
),
RaisedButton(
color: Colors.blueAccent,
onPressed: () {
if (_formKey.currentState.validate()) {
_formKey.currentState.save();
widget.onSaved(_school);
}
},
child:
Text('Next', style: TextStyle(color: Colors.white)))
]))));
}
}
form 2
class SchoolRegTwo extends StatefulWidget {
final School school;
final Function(School) onSaved;
const SchoolRegTwo({Key key, this.school, this.onSaved}) : super(key: key);
#override
_SchoolRegTwoState createState() => _SchoolRegTwoState();
}
class _SchoolRegTwoState extends State<SchoolRegTwo> {
final _formKey = GlobalKey<FormState>();
SchoolDet schooldet;
#override
void initState() {
schooldet = widget.school.address;
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: SingleChildScrollView(
child: new Form(
key: _formKey,
child: Column(children: <Widget>[
Container(
margin: EdgeInsets.only(top: 130),
alignment: Alignment.topCenter,
child: MyTextFormField(
hintText: 'School address 1',
validator: (String value) {
if (value.isEmpty) {
return "Enter your school's address";
}
return null;
},
onSaved: (String value) {
schooldet.addressOne = value;
},
),
),
MyTextFormField(
hintText: 'School address 2',
validator: (String value) {
if (value.isEmpty) {
return "Enter the school's address";
}
return null;
},
onSaved: (String value) {
schooldet.addressTwo = value;
},
),
MyTextFormField(
hintText: 'City',
validator: (String value) {
if (value.isEmpty) {
return 'Enter the city';
}
return null;
},
onSaved: (String value) {
schooldet.city = value;
},
),
MyTextFormField(
hintText: 'Pincode',
isEmail: true,
validator: (String value) {
if (value.isEmpty) {
return "Enter the pincode";
}
return null;
},
onSaved: (String value) {
schooldet.pincode = value;
},
),
MyTextFormField(
hintText: 'State',
isEmail: true,
validator: (String value) {
if (value.isEmpty) {
return "Enter the state";
}
return null;
},
onSaved: (String value) {
schooldet.state = value;
},
),
RaisedButton(
color: Colors.blueAccent,
onPressed: () {
if (_formKey.currentState.validate()) {
_formKey.currentState.save();
widget.school.address = schooldet;
widget.onSaved(widget.school);
}
},
child:
Text('Next', style: TextStyle(color: Colors.white)))
]))));
}
}
form 3
class SchoolRegThree extends StatefulWidget {
School school;
final Function(School) onSaved;
SchoolRegThree({this.school, this.onSaved});
#override
_SchoolRegThreeState createState() => _SchoolRegThreeState();
}
class _SchoolRegThreeState extends State<SchoolRegThree> {
final _formKey = GlobalKey<FormState>();
SchoolUser schooluser;
#override
void initState() {
schooluser = widget.school.user;
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: SingleChildScrollView(
child: new Form(
key: _formKey,
child: Column(children: <Widget>[
Container(
margin: EdgeInsets.only(top: 100),
child: MyTextFormField(
hintText: 'Username',
isPassword: true,
validator: (String value) {
if (value.length < 5) {
return 'Username should be at least 5 characters long';
}
_formKey.currentState.save();
return null;
},
onSaved: (String value) {
schooluser.username = value;
},
),
),
MyTextFormField(
hintText: 'New Password',
isPassword: true,
validator: (String value) {
if (value.length < 7) {
return 'Password should be at least 7 characters long';
} else if (schooluser.password != null) {
print(value);
print(schooluser.password);
}
return null;
},
onSaved: (String value) {
schooluser.password = value;
},
),
RaisedButton(
color: Colors.blueAccent,
onPressed: () {
if (_formKey.currentState.validate()) {
_formKey.currentState.save();
widget.school.user = schooluser;
widget.onSaved(widget.school);
}
},
child: Text('Done',
style: TextStyle(
color: Colors.white,
)))
]))));
}
}
and finally consolidate the model to a single model class
class School {
String schoolName;
String schoolPhone;
String schoolEmail;
String schoolWebsite;
SchoolDet address;
SchoolUser user;
}
class SchoolDet {
String addressOne;
String addressTwo;
String city;
String pincode;
String state;
}
class SchoolUser {
String username;
String password;
}

Answer 2

Best is to use a state management solution like flutter_bloc, provider, etc.
Store it in an array on a different file using state management.
Make the bloc/provider available to all the screens.
You can pass through constructor but I don't recommend that as it will be too messy.