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flutter textformfield validator

Clever Civet answered on August 2, 2022 Popularity 10/10 Helpfulness 6/10

answer flutter textformfield validator

related validator in form field flutter

flutter textformfield validator

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class _LoginForm extends State<LoginForm> {
  // GlobalKey<FormState> formKey = GlobalKey();
  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
  String _email;
  String _password;

  void validateAndSave() {
    final FormState form = _formKey.currentState;
    if (form.validate()) {
      print('Form is valid');
    } else {
      print('Form is invalid');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: EdgeInsets.only(left: 15.0, right: 15.0),
      child: Form(
        key: _formKey,
        child: Column(
          // mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: <Widget>[
            SizedBox(
              height: 150.0,
            ),
            // input field for email
            TextFormField(
              decoration: InputDecoration(labelText: 'Email'),
              validator: (value) =>
                  value.isEmpty ? 'Email cannot be blank' : null,
              // onSaved: (value) => _email = value,
            ),
            // input field for password
            TextFormField(
              decoration: InputDecoration(labelText: 'Password'),
              obscureText: true,
              validator: (value) =>
                  value.isEmpty ? 'Password cannot be blank' : null,
              // onSaved: (value) => _password = value,
            ),
            RaisedButton(
              child: Text(
                'Login',
                style: TextStyle(fontSize: 20.0),
              ),
              onPressed: validateAndSave,
            ),
          ],
        ),
      ),
    );
  }
}

Popularity 10/10 Helpfulness 6/10 Language whatever

Source: stackoverflow.com

Tags: flutter-textformfield whatever

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Contributed on Aug 28 2022

Clever Civet

0 Answers Avg Quality 2/10

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validator in form field flutter

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mixin InputValidationMixin {
  bool isPasswordValid(String password) => password.length == 6;

  bool isEmailValid(String email) {
    Pattern pattern =
      r '^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$';
    RegExp regex = new RegExp(pattern);
    return regex.hasMatch(email);
  }
}

Popularity 10/10 Helpfulness 1/10 Language whatever

Source: www.topcoder.com

Tags: field fiel

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Contributed on Aug 02 2022

Wide-eyed Worm

0 Answers Avg Quality 2/10

flutter textformfield validator

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