在Flutter中创建动态单选按钮 [英] Create dynamic radio buttons in Flutter
本文介绍了在Flutter中创建动态单选按钮的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试创建一个动态表单，其中包含一些文本框和单选按钮.我也使用RadioListTile.
I am trying to create a dynamic form which contains some textbox and radio button. I am using RadioListTile for the same.
在下面的代码中，您可以看到我正在使用 var nameController = TextEditingController(); 来获取文本框的值.我不确定RadioListTile可以使用什么.
In the below code you can see I am using var nameController = TextEditingController(); to get the value of textbox. I am not sure what can be used for RadioListTile.
我也在努力展示动态单选按钮.我在下面添加了完整的代码.如何使单选按钮正常工作并获取所选项目的值，以便将其保存到数据库中?
I am also struggling to show Radio Button Dynamically. I have added full code in the below. How can I get the radio button working and get the value of the selected items, so they can be saved to the database?
class Price extends StatefulWidget {
@override
_PriceState createState() => _PriceState();
}
class FruitsList {
String name;
int index;
FruitsList({this.name, this.index});
}
class _PriceState extends State<Price> {
static final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
final _scaffoldKey = GlobalKey<ScaffoldState>();
int currentIndex = 0;
String person;
String age;
String job;
// Default Radio Button Item
String radioItem = 'Mango';
// Group Value for Radio Button.
int id = 1;
List<FruitsList> fList = [
FruitsList(
index: 1,
name: "Mango",
),
FruitsList(
index: 2,
name: "Banana",
),
FruitsList(
index: 3,
name: "Apple",
),
FruitsList(
index: 4,
name: "Cherry",
),
];
@override
void initState() {
super.initState();
cards.add(createCard());
}
var nameTECs = <TextEditingController>[];
var ageTECs = <TextEditingController>[];
var jobTECs = <TextEditingController>[];
--- Need to help to add Controller for Radio Button ---
var cards = <Card>[];
Card createCard() {
var nameController = TextEditingController();
var ageController = TextEditingController();
var jobController = TextEditingController();
nameTECs.add(nameController);
ageTECs.add(ageController);
jobTECs.add(jobController);
return Card(
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text('Service ${cards.length + 1}'),
TextFormField(
style: TextStyle(color: Colors.blue),
controller: nameController,
decoration: InputDecoration(labelText: 'Name'),
validator: validatetext,
onSaved: (String val) {
person = val;
},
),
TextFormField(
style: TextStyle(color: Colors.blue),
controller: ageController,
decoration: InputDecoration(labelText: 'age'),
validator: validatetext,
onSaved: (String val) {
age = val;
},
),
TextFormField(
style: TextStyle(color: Colors.blue),
controller: jobController,
decoration: InputDecoration(labelText: 'Job'),
validator: validatetext,
onSaved: (String val) {
job = val;
},
),
//Expanded(
// child: Container(
// height: 350.0,
// child:
Row(
children:
fList.map((data) => RadioListTile(
title: Text("${data.name}"),
groupValue: id,
value: data.index,
onChanged: (val) {
setState(() {
radioItem = data.name ;
id = data.index;
});
},
)).toList(),
),
//)),
/* CheckboxListTile(
title: Text("title text"),
value: checkedValue,
onChanged: (newValue) {
setState(() {
checkedValue = newValue;
});
},
//onChanged: (newValue) { ... },
controlAffinity: ListTileControlAffinity.leading, // <-- leading Checkbox
), */
SizedBox(height: 10),
],
),
// ),
);
}
void _validateInputs() {
print('button');
if (_formKey.currentState.validate()) {
_formKey.currentState.save();
_onDone();
} else {
}
}
_onDone() {
updateProfile();
List<PersonEntry> entries = [];
for (int i = 0; i < cards.length; i++) {
var name = nameTECs[i].text;
var age = ageTECs[i].text;
var job = jobTECs[i].text;
entries.add(PersonEntry(name, age, job));
}
}
///////// Save to DB ////////////////////
Future updateProfile() async{
try{
for (int i = 0; i < cards.length; i++) {
var name = nameTECs[i].text;
var age = ageTECs[i].text;
var job = jobTECs[i].text;
Map<String, dynamic> body = {'name': name, 'age': age, 'job' : job };
print(body);
nameTECs[i].clear();
//if(rang == true){
Response response =
await Dio().post("http://192.168.1.102:8080/adddetails.php", data: body);
print(response.statusCode);
if(response.statusCode == 404){
print('404');
}
if(response.statusCode == 200){
nameTECs[i].clear();
}
}
} catch (e) {
print("Exception Caught: $e");
}
}
///////////////////////////////
@override
Widget build(BuildContext context) {
return Scaffold(
key: _scaffoldKey,
appBar: myAppBar(),
endDrawer: myDrawer(),
body: Column(
children: <Widget>[
Expanded(
child:new Form(
key: _formKey,
child: ListView.builder(
itemCount: cards.length,
itemBuilder: (BuildContext context, int index) {
return cards[index];
},
),
),
),
Container(
padding: EdgeInsets.symmetric(horizontal: 2.0),
color: Colors.grey,
child:Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
// Container(
Padding(
padding: const EdgeInsets.all(16.0),
child: FloatingActionButton(
heroTag: "btn1",
child: Icon(Icons.add),
onPressed: () => setState(() => cards.add(createCard())),
backgroundColor: Colors.green,
)
/*RaisedButton(
child: Text('Add new'),
onPressed: () => setState(() => cards.add(createCard())),
),*/
),
Padding(
padding: const EdgeInsets.all(16.0),
child: FloatingActionButton(
heroTag: "btn2",
child: Icon(Icons.remove), onPressed: () => setState(() => cards.removeLast()),
backgroundColor: Colors.red,
)
),
Padding(
padding: const EdgeInsets.all(16.0),
child: FloatingActionButton(
heroTag: "btn3",
child: Icon(Icons.save), onPressed: _validateInputs),
)
],
),
),
],
),
);
}
);
}
}
class PersonEntry {
final String name;
final String age;
final String studyJob;
PersonEntry(this.name, this.age, this.studyJob);
@override
String toString() {
return 'Person: name= $name, age= $age, study job= $studyJob';
}
}
Size get preferredSize => Size.fromHeight(kToolbarHeight);
String validatetext(String value) {
if (value.length < 5)
return 'More than 5 char is required';
else
return null;
}
更新
我想显示用户可以选择的单选按钮，并且一旦用户提交表单，我就可以获取http请求的那些值.您可以添加添加或删除卡的选项.因此，这些单选按钮也会生成.
Update
I want to show Radio buttons that user can select and once user submit the form I can get those value for http request. As you can I have added options to add or remove cards. So, these radio buttons will also generated.
推荐答案
创建字段int _selectedRadioIndex
Create field int _selectedRadioIndex
并更改代码
fList.map((data) => RadioListTile(
title: Text("${data.name}"),
groupValue: id,
value: data.index,
onChanged: (val) {
setState(() {
radioItem = data.name ;
id = data.index;
});
},
)).toList(),
到
fList.map((data) => RadioListTile(
title: Text("${data.name}"),
groupValue: id,
value: data.index,
onChanged: (val) {
setState(() {
radioItem = data.name ;
id = data.index;
_selectedRadioIndex = val;
});
},
)).toList(),
然后在代码中得到它fList.firstWhere((element)=> element.index == _selectedRadioIndex)
then in code just get it fList.firstWhere((element) => element.index == _selectedRadioIndex)
这篇关于在Flutter中创建动态单选按钮的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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