Handle changes to a text field
We can do in 2Ways
1.using text editing controller
2. onChanged()
Example:
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return const MaterialApp(
title: 'Retrieve Text Input',
home: MyCustomForm(),
);
}
}
// Define a custom Form widget.
class MyCustomForm extends StatefulWidget {
const MyCustomForm({Key? key}) : super(key: key);
@override
_MyCustomFormState createState() => _MyCustomFormState();
}
// Define a corresponding State class.
// This class holds data related to the Form.
class _MyCustomFormState extends State<MyCustomForm> {
// Create a text controller and use it to retrieve the current value
// of the TextField.
final myController = TextEditingController();
@override
void initState() {
super.initState();
// Start listening to changes.
myController.addListener(_printLatestValue);
}
@override
void dispose() {
// Clean up the controller when the widget is removed from the widget tree.
// This also removes the _printLatestValue listener.
myController.dispose();
super.dispose();
}
void _printLatestValue() {
print('Second text field: ${myController.text}');
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Retrieve Text Input'),
),
body: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
children: [
TextField(
onChanged: (text) {
print('First text field: $text');
},
),
TextField(
controller: myController,
),
],
),
),
);
}
}