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flutter - 如何从“可搜索的下拉列表”中按名称而不是按ID搜索项目?

转载 作者:行者123 更新时间:2023-12-03 13:29:30 27 4
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如何从“可搜索的下拉列表”中按名称而不是按ID搜索项目?

SearchableDropdown(items:_vagasDisponiveis.map((item) {
return new DropdownMenuItem(
child: Text(item.v_n),
value: item.v_id
);
}
).toList(),
isExpanded: true,
value: vaga_id,
isCaseSensitiveSearch: true,
searchHint: new Text('Select ', style: new TextStyle(fontSize: 20)),
onChanged: (value) {
setState(() {
vaga_id = value;
});
},
)
示例: https://pub.dev/packages/searchable_dropdown

最佳答案

您必须覆盖类的toString(),以便它可以搜索ID和名称
因为SearchableDropdown的源代码使用item.value.toString()当您传递类名称时,它将变为I/flutter ( 7352): Instance of 'VagasDisponivei'您可以在下面复制粘贴运行完整代码

代码段

class VagasDisponivei {
String v_n;
String v_id;

VagasDisponivei({this.v_n, this.v_id});

@override
String toString() {
return '${v_n} ${v_id}';
}
}

SearchableDropdown(
items: _vagasDisponiveis.map((item) {
return new DropdownMenuItem<VagasDisponivei>(
child: Text(item.v_n), value: item);
}).toList(),
isExpanded: true,
value: selectedValue,
isCaseSensitiveSearch: true,
searchHint: new Text(
'Select ',
style: new TextStyle(fontSize: 20),
),
onChanged: (value) {
setState(() {
selectedValue = value;
print(selectedValue);
});
},
),

工作演示

enter image description here

完整的代码
import 'package:flutter/material.dart';
import 'package:searchable_dropdown/searchable_dropdown.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 VagasDisponivei {
String v_n;
String v_id;

VagasDisponivei({this.v_n, this.v_id});

@override
String toString() {
return '${v_n} ${v_id}';
}
}

class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
List<VagasDisponivei> _vagasDisponiveis;
String vaga_name;
VagasDisponivei selectedValue;
void _incrementCounter() {
setState(() {
_counter++;
});
}

@override
void initState() {
// TODO: implement initState
super.initState();
_vagasDisponiveis = [
VagasDisponivei(v_id: "1", v_n: "abc"),
VagasDisponivei(v_id: "2", v_n: "def"),
VagasDisponivei(v_id: "3", v_n: "dgg"),
];
}

@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
SearchableDropdown(
items: _vagasDisponiveis.map((item) {
return new DropdownMenuItem<VagasDisponivei>(
child: Text(item.v_n), value: item);
}).toList(),
isExpanded: true,
value: selectedValue,
isCaseSensitiveSearch: true,
searchHint: new Text(
'Select ',
style: new TextStyle(fontSize: 20),
),
onChanged: (value) {
setState(() {
selectedValue = value;
print(selectedValue);
});
},
),
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}

SearchableDropdown的代码段
if(widget.isCaseSensitiveSearch){
print(item.value.toString());
isContains = item.value.toString().contains(keyword);
}

关于flutter - 如何从“可搜索的下拉列表”中按名称而不是按ID搜索项目?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59381692/

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