import 'package:flutter/material.dart';
class AppForm extends StatefulWidget {
// Required for form validations
GlobalKey<FormState> formKey = GlobalKey<FormState>();
// Handles text onchange
TextEditingController nameController;
TextEditingController ageController;
AppForm({this.formKey, this.nameController, this.ageController});
@override
_AppFormState createState() => _AppFormState();
}
class _AppFormState extends State<AppForm> {
String _validateName(String value) {
if (value.length < 3) return 'Name must be more than 2 charater';
return null;
}
String _validateAge(String value) {
Pattern pattern = r'(?<=\s|^)\d+(?=\s|$)';
RegExp regex = new RegExp(pattern);
if (!regex.hasMatch(value)) return 'Age must be a number';
return null;
}
@override
Widget build(BuildContext context) {
return Form(
key: widget.formKey,
autovalidate: true,
child: Column(
children: <Widget>[
TextFormField(
controller: widget.nameController,
keyboardType: TextInputType.text,
decoration: InputDecoration(labelText: 'Name'),
validator: _validateName,
),
TextFormField(
controller: widget.ageController,
keyboardType: TextInputType.number,
decoration: InputDecoration(labelText: 'Age'),
validator: _validateAge,
),
],
),
);;
}
}
