Created
June 9, 2024 22:44
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enable or disable btn flutter snippet code
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| import 'package:flutter/material.dart'; | |
| void main() { | |
| runApp(MyApp()); | |
| } | |
| class MyApp extends StatefulWidget { | |
| MyApp({super.key}); | |
| @override | |
| State<MyApp> createState() => _MyAppState(); | |
| } | |
| class _MyAppState extends State<MyApp> { | |
| final myController = TextEditingController(); | |
| bool enable = false; | |
| @override | |
| Widget build(BuildContext context) { | |
| return MaterialApp( | |
| debugShowCheckedModeBanner: false, | |
| home: Scaffold( | |
| body: Center( | |
| child: Column( | |
| children: [ | |
| SizedBox( | |
| width: 200, | |
| child: TextField( | |
| cursorColor: Colors.red, | |
| controller: myController, | |
| onChanged: (val) { | |
| if (myController.text.isNotEmpty) { | |
| enable = true; | |
| } else { | |
| enable = false; | |
| } | |
| setState(() { | |
| // | |
| }); | |
| }), | |
| ), | |
| SizedBox(height: 20), | |
| ElevatedButton( | |
| onPressed: (enable) | |
| ? () { | |
| print(myController.text); | |
| } | |
| : null, | |
| child: Text('login'), | |
| ), | |
| SizedBox(height: 20), | |
| ElevatedButton( | |
| onPressed: null, | |
| child: Text('sign-in'), | |
| ), | |
| ], | |
| ), | |
| ), | |
| ), | |
| ); | |
| } | |
| } |
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