validation_chain 0.0.1

Validation Chain API.

Validation Chain

A validation chain api to use with TextFormField or Backend applicaitons made with dart.

Installing

Run this command: With flutter:

$ flutter pub add validation_chain

This will add a line like this to your package's pubspec.yaml (and run an implicit flutter pub get):

dependencies:
    validation_chain: ^0.0.1

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

Import it

Now in your Dart code, you can use:

import 'package:validation_chain/validation_chain.dart';

Usage

import 'package:validation_chain/validation_chain.dart';

String? compulsory(String value) {
  return value.isEmpty ? 'Required' : null;
}

String? tooShort(String value) {
  return value.length < 5 ? 'Too Short' : null;
}

String? tooLong(String value) {
  return value.length > 10 ? 'Too Long' : null;
}

final validationChain = ValidationChain([
    compulsory,
    tooShort,
    tooLong,
]);
    
validationChain.validate('');               // 'Required'
validationChain.validate('Hey');            // 'Too Short'
validationChain.validate('Hello');          // null
validationChain.validate('Hello World');    // 'Too Long'