我无法显示“选项”并获取（在终端中打印）所选选项的“ID”。
如何将 json 作为地图检索并在 flutter_form_builder 中有效使用它？
这是json对象：
{
id: 7,
poll: What is the capital of Egypt?,
created_at: 2020-10-22 10:53:41,
votes_count: 4,
likes_count: 0,
options: [
{
id: 20,
option: Tunis,
pollId: 7,
votes_count: 1
}, {
id: 21,
option: Cairo,
pollId: 7,
votes_count: 3
}, {
id: 22,
option: New York,
pollId: 7,
votes_count: 0
}],
user_name: salem,
user_image: null,
topics: []
}
这是我的 poll_details 页面：
import 'package:flutter/material.dart';
import 'package:circular_profile_avatar/circular_profile_avatar.dart';
import 'package:flutter_form_builder/flutter_form_builder.dart';
import 'package:like_button/like_button.dart';
import '../services/poll_services.dart';
import '../widgets/loading_widget.dart';
class PollDetails extends StatefulWidget {
final id;
PollDetails({this.id});
@override
_PollDetailsState createState() => _PollDetailsState(id);
}
class _PollDetailsState extends State<PollDetails> {
var id;
_PollDetailsState(this.id);
final GlobalKey<FormBuilderState> _fbKey = GlobalKey<FormBuilderState>();
@override
void initState() {
super.initState();
optionsList.clear();
}
@override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
appBar: AppBar(title: Text("Details")),
body: FutureBuilder(
future: singlePoll(id),
builder: (context, snapshot) {
if(snapshot.hasData){
return ListView(
padding: EdgeInsets.fromLTRB(18, 40, 18, 0),
children: [
Padding(
padding: EdgeInsets.only(bottom: 20),
child: Container(
padding: EdgeInsets.fromLTRB(10, 40, 0, 40),
decoration: BoxDecoration(
shape: BoxShape.rectangle,
borderRadius: BorderRadius.circular(10.0),
border: Border.all(
color: Theme.of(context).primaryColor,
width: 5.0,
style: BorderStyle.solid
)
),
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
if(imgPath(snapshot.data) == null) CircleAvatar(radius: 35,child: Image.asset('images/avatar.png'))
else CircularProfileAvatar(
imgPath(snapshot.data),
radius: 35,
borderWidth: 3.0,
borderColor: Colors.white,
backgroundColor: Colors.transparent,
foregroundColor: Colors.transparent,
errorWidget: (context, url, error) => Container(child: Icon(Icons.error)),
placeHolder: (context, url) => Container(
width: 50,
height: 50,
child: Text("Loading image..."),
)
),
SizedBox(width: 10.0),
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
children: [
Text(
userName(snapshot.data),
style: TextStyle(fontSize: 20)
),
Flexible(
fit: FlexFit.loose,
child: Text(
votesCount(snapshot.data).toString()+" participants to this poll",
style: TextStyle(fontSize: 13)
)
)
]
)
)
]
)
)
),
///////////////////////////////// POLLS //////////////////////////////////////////////
FormBuilder(
key: _fbKey,
autovalidateMode: AutovalidateMode.always,
child: FormBuilderRadioGroup(
attribute: 'options',
decoration: InputDecoration(labelText: 'Choose only one:'),
validators: [FormBuilderValidators.required()],
orientation: GroupedRadioOrientation.vertical,
options: [
for (var i in optionsList) i['option'].toString()
]
.map((option) => FormBuilderFieldOption(value: option))
.toList(growable: false),
)
),
RaisedButton(
child: Text("Submit"),
onPressed: () async{
_fbKey.currentState.save();
if (_fbKey.currentState.validate()) {
// Loading().show(context);
var option = _fbKey.currentState.value['options'];
print(option);
// var resp = await createPoll(question, tagS, choiceS);
// if(resp['status'] == "success"){
// Navigator.pop(context); //pop dialog
// } else {
// Navigator.pop(context); //pop dialog
// }
}
}
),
//////////////////////////// Like Button ///////////////////////////////
Row(
children: [
LikeButton(
size: 40,
circleColor:
CircleColor(start: Colors.red, end: Colors.red),
bubblesColor: BubblesColor(
dotPrimaryColor: Colors.red,
dotSecondaryColor: Colors.red,
),
likeBuilder: (bool isLiked) {
return Icon(
Icons.favorite,
color: isLiked ? Colors.red : Colors.grey,
size: 40,
);
},
likeCount: likes(snapshot.data),
countBuilder: (int count, bool isLiked, String text) {
var color = isLiked ? Colors.red : Colors.grey;
Widget result;
if (count == 0) {
result = Text(
"0",
style: TextStyle(color: color),
);
} else
result = Text(
text,
style: TextStyle(color: color),
);
return result;
}
),
Expanded(child: Text(" have liked this. Show some love, too!"))
]
),
Column(
children: [
// optionsList.forEach((element) => Text('option'))
for (var i in optionsList) Text(i['option'].toString())
]
),
RaisedButton(
child: Text("data"),
onPressed: (){singlePoll(id);}
)
]
);
}else {
return Center(child: CircularProgressIndicator());
}
}
)
)
);
}
}
这是我用来获取响应的请求：
Future singlePoll(int id) async {
String url = baseUrl+"poll/get";
var stringID = id.toString();
var token = await storage.read(key: "jwt");
try{
final response = await http.post(
url,
headers: {'Accept':'application/json', 'Authorization':token},
body: {'pollId':stringID}
);
var dataToJson = jsonDecode(response.body);
for (var option in dataToJson['options']){
var optionID = option['id'];
var optionTitle = option['option'].toString();
var votesCount = option['votes_count'];
optionsList.add(option);
}
print(dataToJson);
return dataToJson;
} catch (e){
print('error caught: $e');
}
}
如您所见，我使用了一种变通方法来获取列表并显示它。
任何建议都是有价值的。
提前致谢...