form_validator 2.1.1
form_validator: ^2.1.1 copied to clipboard
Simplest form validation library for flutter's form field widgets
import 'package:flutter/material.dart';
import 'package:form_validator/form_validator.dart';
void main() {
runApp(MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: HomePage(),
));
}
class HomePage extends StatefulWidget {
@override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
GlobalKey<FormState> _form = GlobalKey<FormState>();
void _validate() {
_form.currentState.validate();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Example'),
),
body: Form(
key: _form,
child: SingleChildScrollView(
padding: const EdgeInsets.all(15),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
TextFormField(
validator: ValidationBuilder().email().maxLength(50).build(),
decoration: InputDecoration(labelText: 'Email'),
),
SizedBox(height: 30),
TextFormField(
validator:
ValidationBuilder().minLength(5).maxLength(50).build(),
decoration: InputDecoration(
labelText: 'Name',
helperText: 'Min length: 5, max length: 50',
),
),
],
),
),
),
floatingActionButton: FloatingActionButton(
onPressed: _validate,
tooltip: 'Next',
child: Icon(Icons.arrow_forward),
),
);
}
}