awesome_validator

A flutter form field validator that provides common validation options.

Usage

    //Basic Validator
     TextFormField(  
         validator: EmailValidator(errorText: 'Enter a valid email address')  
         );   
     

Multi validator

   
  final passwordValidator = MultiValidator([  
    RequiredValidator(errorText: 'Password is required'),  
    MinLengthValidator(8, errorText: 'Password must be at least 8 digits long'),  
 ]);  
  
  final TextEditingController password = TextEditingController();
  
  Form(  
    key: formKey,  
    child: Column(children: [  
      TextFormField(  
        obscureText: true,  
        onChanged: (val) => password = val,  
        validator: passwordValidator,  
      ),  
    ]),  
  );  
    

Example

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

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Awesome Validator'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final GlobalKey<FormState> formKey = GlobalKey<FormState>();

  final TextEditingController password = TextEditingController();
  final TextEditingController email = TextEditingController();

  final passwordValidator = MultiValidator([
    RequiredValidator(errorText: 'password is required'),
    MinLengthValidator(8, errorText: 'password must be at least 8 digits long'),
  ]);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Padding(
              padding: const EdgeInsets.all(8.0),
              child: Form(
                  key: formKey,
                  child: Column(
                    children: [
                      Padding(
                        padding: const EdgeInsets.all(8.0),
                        child: TextFormField(
                          controller: email,
                          decoration: const InputDecoration(
                            border: OutlineInputBorder(),
                            hintText: 'Enter Email',
                          ),
                          validator: EmailValidator(
                              errorText: 'Please enter valid email'),
                        ),
                      ),
                      Padding(
                        padding: const EdgeInsets.all(8.0),
                        child: TextFormField(
                          controller: password,
                          obscureText: true,
                          decoration: const InputDecoration(
                            border: OutlineInputBorder(),
                            hintText: 'Enter Password',
                          ),
                          validator: passwordValidator,
                        ),
                      ),
                    ],
                  )),
            ),
            ElevatedButton(
              onPressed: () {
                if (formKey.currentState!.validate()) {
                  // Form is validated, do something
                  print('Form is validated!');
                }
              },
              child: const Text('Submit'),
            ),
          ],
        ),
      ),
    );
  }
}