flutter_validator_pro 0.1.0

A Flutter plugin for form validation including email, password, phone number, and custom multi-validator support.

validators

A lightweight Flutter package for simple, chainable form validation.

Right now the package focuses on email validation through a fluent API, so you can stack rules and return the first validation error as a String?.

Features

• Chain multiple email validation rules in a readable way
• Return null when validation passes
• Return the first validation message when validation fails
• Keep validation logic outside widgets and forms

Installation

Add the package to your pubspec.yaml:

dependencies:
  validators:
    path: ../validators

Then run:

flutter pub get

Import

import 'package:validators/validators.dart';

Basic Usage

Use Validatiors to start a validation chain and call validate() at the end.

final error = Validatiors()
    .emailValidator(value: '[e-mail]')
    .isRequired()
    .isValidEmail()
    .noSpaces()
    .validate();

if (error == null) {
  print('Email is valid');
} else {
  print(error);
}

This works well with Flutter form fields:

TextFormField(
  validator: (value) => Validatiors()
      .emailValidator(value: value)
      .isRequired()
      .isValidEmail()
      .noSpaces()
      .singleAtSymbol()
      .noConsecutiveDots()
      .validate(),
)

Available Email Rules

The current email validator supports these chainable methods:

• isRequired()
• isValidEmail()
• noSpaces()
• hasAtSymbol()
• allowDomain(List<String> domains)
• minLength(int length)
• maxLength(int length)
• singleAtSymbol()
• noStartingDot()
• noEndingDot()
• noConsecutiveDots()
• validate()

Examples

Validate that an email includes @:

final error = Validatiors()
    .emailValidator(value: 'bharat.sc01.com')
    .hasAtSymbol()
    .validate();

Restrict allowed domains:

final error = Validatiors()
    .emailValidator(value: '[e-mail]')
    .allowDomain(['.com', '.in', '.outlook'])
    .validate();

Apply multiple checks together:

final error = Validatiors()
    .emailValidator(value: ' [e-mail] ')
    .isRequired()
    .noSpaces()
    .singleAtSymbol()
    .noStartingDot()
    .noEndingDot()
    .noConsecutiveDots()
    .validate();

How Validation Works

Each rule checks the current value and stores the first error it finds. Once an error has been set, later rules do not replace it. validate() returns:

• null when the value passes all applied rules
• An error message when a rule fails

Current Scope

The public API currently provides:

• Email validation support through emailValidator(...)
• A placeholder contactValidator(...) method that is not yet implemented with validation rules

Testing

Run the package tests with:

flutter test

Notes

• The entry class is named Validatiors in the current implementation.
• emailValidator expects a non-null value internally, so it is safest to use it with form values that are present or passed directly from a validator callback.