nex_validation 0.0.3

A set of extension methods for performing common validations on strings in Dart applications.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:nex_validation/extensions/nex_validations_extensions.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
     debugShowCheckedModeBanner: false,
      title: 'Validation Example',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: ValidationScreen(),
    );
  }
}


class ValidationScreen extends StatefulWidget {
  const ValidationScreen({super.key});

  @override
  State<ValidationScreen> createState() => _ValidationScreenState();
}

class _ValidationScreenState extends State<ValidationScreen> {
  final _formKey = GlobalKey<FormState>();

  final _nameController = TextEditingController();
  final _emailController = TextEditingController();
  final _phoneController = TextEditingController();
  final _passwordController = TextEditingController();

  String? _nameError;
  String? _emailError;
  String? _phoneError;
  String? _passwordError;

  void _validateForm() {
    setState(() {
      _nameError = _nameController.text.nameValidations(
        min: 3,
        emptyMsg: 'Name cannot be empty',
        lengthMsg: 'Name must be between 3 and 20 characters',
        validMsg: 'Name contains invalid characters',
      );

      _emailError = _emailController.text.emailValidations(
        emptyMsg: 'Email address cannot be empty',
        validMsg: 'Invalid email address format',
      );

      _phoneError = _phoneController.text.phoneNumberValidations(
        emptyMsg: 'Phone number cannot be empty',
        minLengthMsg: 'Phone number must be at least 5 digits long',
        maxLengthMsg: 'Phone number cannot exceed maximum length',
      );

      _passwordError = _passwordController.text.passwordValidations(
        min: 6,
        max: 12,
        emptyMsg: 'Password cannot be empty',
        minLengthMsg: 'Password must be at least 6 characters long',
        maxLengthMsg: 'Password cannot exceed 12 characters',
      );
    });

    if (_nameError == null &&
        _emailError == null &&
        _phoneError == null &&
        _passwordError == null) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Form submitted successfully!')),
      );
    }
  }

  Widget _buildTextField({
    required String label,
    required TextEditingController controller,
    String? errorText,
    bool obscure = false,
    TextInputType type = TextInputType.text,
  }) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        TextField(
          controller: controller,
          obscureText: obscure,
          keyboardType: type,
          decoration: InputDecoration(
            labelText: label,
            border: const OutlineInputBorder(),
            errorText: errorText?.isEmpty == true ? null : errorText,
          ),
        ),
        const SizedBox(height: 16),
      ],
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Validation Example')),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Form(
          key: _formKey,
          child: SingleChildScrollView(
            child: Column(
              children: [
                _buildTextField(
                  label: "Name",
                  controller: _nameController,
                  errorText: _nameError,
                ),
                _buildTextField(
                  label: "Email",
                  controller: _emailController,
                  errorText: _emailError,
                  type: TextInputType.emailAddress,
                ),
                _buildTextField(
                  label: "Phone Number",
                  controller: _phoneController,
                  errorText: _phoneError,
                  type: TextInputType.phone,
                ),
                _buildTextField(
                  label: "Password",
                  controller: _passwordController,
                  errorText: _passwordError,
                  obscure: true,
                ),
                const SizedBox(height: 20),
                ElevatedButton(
                  onPressed: _validateForm,
                  style: ElevatedButton.styleFrom(
                    minimumSize: const Size(double.infinity, 50),
                  ),
                  child: const Text("Submit"),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}