TextFormField(
// The validator receives the text that the user has entered.
validator: (value) {
if (value.isEmpty) {
return 'Please enter some text';
}
return null;
},
);
Build a form with validation - Flutter Cookbook
https://docs.flutter.dev/cookbook/forms/validationBuild a form with validation - Flutter Cookbook
https://docs.flutter.dev/cookbook/forms/validationBuild a form with validation - Flutter Cookbook
https://docs.flutter.dev/cookbook/forms/validationBuild a form with validation - Flutter Cookbook
https://docs.flutter.dev/cookbook/forms/validation