dart validate form

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; Form( key: _formKey, child: Column(children: [ TextFormField( obscureText: true, onChanged: (val) => password = val, // assign the the multi validator to the TextFormField validator validator: passwordValidator, ), // using the match validator to confirm password TextFormField( validator: (val) => MatchValidator(errorText: 'passwords do not match').validateMatch(val, password), ) ]), );

create a validator in flutter

// Define a custom Form widget.
class MyCustomForm extends StatefulWidget {
  @override
  MyCustomFormState createState() {
    return MyCustomFormState();
  }
}

// Define a corresponding State class.
// This class holds data related to the form.
class MyCustomFormState extends State<MyCustomForm> {
  // Create a global key that uniquely identifies the Form widget
  // and allows validation of the form.
  //
  // Note: This is a `GlobalKey<FormState>`,
  // not a GlobalKey<MyCustomFormState>.
  final _formKey = GlobalKey<FormState>();

  @override
  Widget build(BuildContext context) {
    // Build a Form widget using the _formKey created above.
    return Form(
      key: _formKey,
      child: Column(
        children: <Widget>[
              // Add TextFormFields and ElevatedButton here.
        ]
     )
    );
  }
}

Posted by: Guest on November-19-2020

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