flutter_formik

Description:

flutter formik

Flutter Formik #
Flutter Formik is a form management library for Flutter inspired by the React Formik package. It provides an easy and intuitive way to handle form state, validation, and submission in your Flutter applications. Flutter Formik is designed to be simple, flexible, and extensible, allowing you to build complex forms with minimal boilerplate code. It is built on top of the form_validator package to provide customizable validation rules and error messages, this package remind of yup js library lol.
Features #

Simple and declarative API for managing form state
Built-in validation support with customizable validation rules using form_validator package
Form submission handling with optional asynchronous operations
Integration with Flutter's widget tree for seamless rendering
Designed to promote separation of concerns and reusability

Installation #
To use Flutter Formik in your Flutter project, add the following line to your pubspec.yaml file:
dependencies:
flutter_formik: ^1.0.0
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Then run flutter pub get to install the package.
Usage #
Here's a basic example of how to use Flutter Formik:
import 'package:flutter/material.dart';
import 'package:flutter_formik/flutter_formik.dart';
import 'package:form_validator/form_validator.dart';

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

class Demo extends StatelessWidget {
const Demo({super.key});

@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Formik Demo',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
useMaterial3: true,
),
home: Scaffold(
appBar: AppBar(
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
title: const Text('Flutter Formik Demo'),
),
body: Formik(
initialValues: {
'email': '',
'password': '',
},
validationSchema: {
'email': ValidationBuilder().required('Email is required').email('Email is not valid'),
'password': ValidationBuilder().required('Password is required').minLength(6, 'Password must be at least 6 characters'),
},
onSubmit: (payload, errors) {
if (errors.isNotEmpty) {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: Text(errors.values.first),
),
);
return;
}
UserModel user = UserModel.fromJson(payload);
// Send user object to your business logic
// ...
},
child: (values, isValid, handleSubmit, handleReset, handleChange, errors) {
return Column(
children: <Widget>[
TextField(
decoration: InputDecoration(
labelText: 'Email',
errorText: errors['email'],
),
onChanged: (value) {
handleChange('email', value);
},
),
TextField(
decoration: InputDecoration(
labelText: 'Password',
errorText: errors['password'],
),
onChanged: (value) {
handleChange('password', value);
},
),
ElevatedButton(
onPressed: () {
handleSubmit();
},
child: const Text('Submit'),
),
],
);
},
),
),
);
}
}
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For more detailed examples and advanced usage, please refer to the examples folder in the Flutter Formik GitHub repository.
Documentation #
The documentation for Flutter Formik is available in the GitHub repository. It provides detailed explanations of the available features, usage guidelines, and API references.
Contributing #
Contributions to Flutter Formik are welcome and encouraged! If you have any ideas, suggestions, or bug reports, please feel free to open an issue or submit a pull request on the GitHub repository.
License #
Flutter Formik is licensed under the MIT License. See the LICENSE file for more information.
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