form_field_validator 1.0.0+1

  • Readme
  • Changelog
  • Installing
  • new71

form_field_validator #

A straightforward flutter form field validator that provides common validation options.

Usage #

     // assign it directly to a TextFormField validator  
     // you don't have the pass the value your self like  
     // validator: (value) => EmailValidator(errorText: 'invalid email address').call(value)  
         validator: EmailValidator(errorText: 'enter a valid email address')  
     // create a reusable instance  
     final requiredValidator = RequiredValidator(errorText: 'this field is required');  
     // again assign it directly to the validator  
     TextFormField(validator: requiredValidator);  

Multi rules validation #

  final passwordValidator = MultiValidator([  
    RequiredValidator(errorText: 'password is required'),  
    MinLengthValidator(8, errorText: 'password must be at least 8 digits long'),  
    PatternValidator(r'(?=.*?[#?!@$%^&*-])', errorText: 'passwords must have at least one special character')  
  String password;  
    key: _formKey,  
    child: Column(children: [  
        obscureText: true,  
        onChanged: (val) => password = val,  
        // assign the the multi validator to the TextFormField validator  
        validator: passwordValidator,  
      // using the match validator to confirm password  
        validator: (val) => MatchValidator(errorText: 'passwords do not match').validateMatch(val, password),  

Make your own validator #

class LYDPhoneValidator extends TextFieldValidator {  
  // pass the error text to the super constructor  
  LYDPhoneValidator({String errorText = 'enter a valid LYD phone number'}) : super(errorText);  
  // return false if you want the validator to return error  
  // message when the value is empty.  
   bool get ignoreEmptyValues => true;  
	  bool isValid(String value) {  
	    // return true if the value is valid according the your condition  
	    return hasMatch(r'^((+|00)?218|0?)?(9[0-9]{8})$', value);  

   // use it by assigning it to the TextFormField validator  
   TextFormField(validator: LYDPhoneValidator());  

// you can also extend the base FieldValidator class   
// to work with non string values  
class CustomValidator extends FieldValidator<T>{  
   CustomValidator(String errorText) : super(errorText);  
	  bool isValid(T value) {  
	    // TODO: implement isValid  
	    return null;  


typo fix #


  • initial release.

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  form_field_validator: ^1.0.0+1

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter pub get

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

3. Import it

Now in your Dart code, you can use:

import 'package:form_field_validator/form_field_validator.dart';
Describes how popular the package is relative to other packages. [more]
Code health derived from static analysis. [more]
Reflects how tidy and up-to-date the package is. [more]
Weighted score of the above. [more]
Learn more about scoring.

We analyzed this package on Oct 21, 2019, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.5.1
  • pana: 0.12.21
  • Flutter: 1.9.1+hotfix.4


Detected platforms: Flutter

References Flutter, and has no conflicting libraries.

Maintenance suggestions

Maintain an example. (-10 points)

Create a short demo in the example/ directory to show how to use this package.

Common filename patterns include main.dart, example.dart, and form_field_validator.dart. Packages with multiple examples should provide example/

For more information see the pub package layout conventions.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.1.0 <3.0.0
flutter 0.0.0
intl >=0.16.0 <1.0.0 0.16.0
Transitive dependencies
collection 1.14.11 1.14.12
meta 1.1.7
path 1.6.4
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies