Designing a Form Submission Page in Flutter

Designing a form submission page is an important part of creating applications with Flutter. In this blog, we'll explore how to design a form submission page in Flutter with an example.

First, let's create a basic form submission page with a text field, a drop-down menu, and a button to submit the form.

import 'package:flutter/material.dart';
class FormSubmissionPage extends StatefulWidget {
  @override
  _FormSubmissionPageState createState() => _FormSubmissionPageState();
}
class _FormSubmissionPageState extends State<FormSubmissionPage> {
  final _formKey = GlobalKey<FormState>();
  String _name;
  String _gender;
  List<String> _genderOptions = ['Male', 'Female', 'Other'];
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Form Submission Page'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Form(
          key: _formKey,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
              Text(
                'Name',
                style: TextStyle(
                  fontSize: 16.0,
                  fontWeight: FontWeight.bold,
                ),
              ),
              TextFormField(
                decoration: InputDecoration(
                  hintText: 'Enter your name',
                ),
                validator: (value) {
                  if (value.isEmpty) {
                    return 'Please enter your name';
                  }
                  return null;
                },
                onSaved: (value) {
                  _name = value;
                },
              ),
              SizedBox(height: 16.0),
              Text(
                'Gender',
                style: TextStyle(
                  fontSize: 16.0,
                  fontWeight: FontWeight.bold,
                ),
              ),
              DropdownButtonFormField<String>(
                value: _gender,
                decoration: InputDecoration(
                  hintText: 'Select your gender',
                ),
                validator: (value) {
                  if (value == null) {
                    return 'Please select your gender';
                  }
                  return null;
                },
                onChanged: (value) {
                  setState(() {
                    _gender = value;
                  });
                },
                items: _genderOptions.map((String value) {
                  return DropdownMenuItem<String>(
                    value: value,
                    child: Text(value),
                  );
                }).toList(),
              ),
              SizedBox(height: 16.0),
              RaisedButton(
                child: Text('Submit'),
                onPressed: () {
                  if (_formKey.currentState.validate()) {
                    _formKey.currentState.save();
                    _submit();
                  }
                },
              ),
            ],
          ),
        ),
      ),
    );
  }
  void _submit() {
    // Handle form submission
  }
}​

In this code, we're using the Form widget to create a form with a TextFormField for the user's name and a DropdownButtonFormField for the user's gender. We're also using the validator property to ensure that the entered name and selected gender are valid.

The onSaved property of the TextFormField and DropdownButtonFormField is used to save the entered values to variables. These variables can then be used in the _submit() function to handle the form submission.

The DropdownButtonFormField is created with a list of options for the user to select from. We're using the map method to create a list of DropdownMenuItem widgets for each option.

In terms of styling, we're using the TextStyle property to create bold text for the field names. We're also using the SizedBox widget to add spacing between the form fields and the submit button.

Overall, this code provides a basic example of how to design a form submission page