有時候需要防止用戶誤點擊按鈕,特別是用flutter web做前端, 和後端交互的時候.
通過對點擊按鈕事件的時間間隔做控制,來實現對按鈕點擊的控制.
方法定義
var lastPopTime = DateTime.now();
void intervalClick(int needTime){
// 防重複提交
if(lastPopTime == null || DateTime.now().difference(lastPopTime) > Duration(seconds: needTime)){
print(lastPopTime);
lastPopTime = DateTime.now();
print("允許點擊");
}else{
// lastPopTime = DateTime.now(); //如果不註釋這行,則強制用戶一定要間隔2s後才能成功點擊. 而不是以上一次點擊成功的時間開始計算.
print("請勿重複點擊!");
}
}
調用
floatingActionButton: FloatingActionButton(
onPressed:(){
intervalClick(2);
},
tooltip: 'Increment',
child: Icon(Icons.add),
),
完整demo代碼
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
var lastPopTime = DateTime.now();
void intervalClick(int needTime){
// 防重複提交
if(lastPopTime == null || DateTime.now().difference(lastPopTime) > Duration(seconds: needTime)){
print(lastPopTime);
lastPopTime = DateTime.now();
print("允許點擊");
}else{
// lastPopTime = DateTime.now(); //如果不註釋這行,則強制用戶一定要間隔2s後才能成功點擊. 而不是以上一次點擊成功的時間開始計算.
print("請勿重複點擊!");
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed:(){
intervalClick(2);
},
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}