flutter :how can I fetch data from json?
-2
I trying fetch data from json by below code,but in this process I getting a error (type 'List' is not a subtype of type 'Map'). Please help me in this
json structure is below
[{id: 1, fname: Semester Fees, sname: 1st Semester, fee_amount: 4000, status: 0}, {id: 2, fname: Admission Fees, sname: 2nd Semester, fee_amount: 4000, status: 0}]
String url = 'http://192.168.42.124/my_payment/getcoursefee.php';
List data;
Future<String> makeRequest() async {
var response = await http
.post(Uri.encodeFull(url), headers: {"Accept": "application/json"},
body: {
"student_id": "261",
});
setState(() {
var extractdata = json.decode(response.body);
Student student =new Student.fromJson(extractdata);
print(student.studentId);
print(extractdata);
});
}
@override
void initState() {
this.makeRequest();
}
my student class is below
class Student{
String studentId;
Student({
this.studentId,
});
factory Student.fromJson(Map<String, dynamic> parsedJson){
return Student(
studentId: parsedJson['id'],
);
}
}
json
flutter edited Nov 18 '18 at 7:38
Barr J
6,10911031
asked Nov 18 '18 at 7:23
Hitanshu GogoiHitanshu Gogoi
107110
add a comment |
-2
I trying fetch data from json by below code,but in this process I getting a error (type 'List' is not a subtype of type 'Map'). Please help me in this
json structure is below
[{id: 1, fname: Semester Fees, sname: 1st Semester, fee_amount: 4000, status: 0}, {id: 2, fname: Admission Fees, sname: 2nd Semester, fee_amount: 4000, status: 0}]
String url = 'http://192.168.42.124/my_payment/getcoursefee.php';
List data;
Future<String> makeRequest() async {
var response = await http
.post(Uri.encodeFull(url), headers: {"Accept": "application/json"},
body: {
"student_id": "261",
});
setState(() {
var extractdata = json.decode(response.body);
Student student =new Student.fromJson(extractdata);
print(student.studentId);
print(extractdata);
});
}
@override
void initState() {
this.makeRequest();
}
my student class is below
class Student{
String studentId;
Student({
this.studentId,
});
factory Student.fromJson(Map<String, dynamic> parsedJson){
return Student(
studentId: parsedJson['id'],
);
}
}
json
flutter edited Nov 18 '18 at 7:38
Barr J
6,10911031
asked Nov 18 '18 at 7:23
Hitanshu GogoiHitanshu Gogoi
107110
The JSON in your example is a List, not a Map. So, what is unclear to you?
– Andrey Turkovsky
Nov 18 '18 at 8:00
how can i get the list value
– Hitanshu Gogoi
Nov 18 '18 at 8:36
The issue is that you are getting JSON list and you are trying to pass it to constructor where is expected a Map. And also that you are passing multiple entities. You have to split the list in for cycle and create multiple objects from those entities inside. See the @AndreyTurkovsky solution, that is what you want!
– tenhobi
Nov 18 '18 at 9:12
add a comment |
-2
-2
-2
I trying fetch data from json by below code,but in this process I getting a error (type 'List' is not a subtype of type 'Map'). Please help me in this
json structure is below
[{id: 1, fname: Semester Fees, sname: 1st Semester, fee_amount: 4000, status: 0}, {id: 2, fname: Admission Fees, sname: 2nd Semester, fee_amount: 4000, status: 0}]
String url = 'http://192.168.42.124/my_payment/getcoursefee.php';
List data;
Future<String> makeRequest() async {
var response = await http
.post(Uri.encodeFull(url), headers: {"Accept": "application/json"},
body: {
"student_id": "261",
});
setState(() {
var extractdata = json.decode(response.body);
Student student =new Student.fromJson(extractdata);
print(student.studentId);
print(extractdata);
});
}
@override
void initState() {
this.makeRequest();
}
my student class is below
class Student{
String studentId;
Student({
this.studentId,
});
factory Student.fromJson(Map<String, dynamic> parsedJson){
return Student(
studentId: parsedJson['id'],
);
}
}
json
flutter edited Nov 18 '18 at 7:38
Barr J
6,10911031
asked Nov 18 '18 at 7:23
Hitanshu GogoiHitanshu Gogoi
107110
I trying fetch data from json by below code,but in this process I getting a error (type 'List' is not a subtype of type 'Map'). Please help me in this
json structure is below
[{id: 1, fname: Semester Fees, sname: 1st Semester, fee_amount: 4000, status: 0}, {id: 2, fname: Admission Fees, sname: 2nd Semester, fee_amount: 4000, status: 0}]
String url = 'http://192.168.42.124/my_payment/getcoursefee.php';
List data;
Future<String> makeRequest() async {
var response = await http
.post(Uri.encodeFull(url), headers: {"Accept": "application/json"},
body: {
"student_id": "261",
});
setState(() {
var extractdata = json.decode(response.body);
Student student =new Student.fromJson(extractdata);
print(student.studentId);
print(extractdata);
});
}
@override
void initState() {
this.makeRequest();
}
my student class is below
class Student{
String studentId;
Student({
this.studentId,
});
factory Student.fromJson(Map<String, dynamic> parsedJson){
return Student(
studentId: parsedJson['id'],
);
}
}
json
flutter json
flutter edited Nov 18 '18 at 7:38
Barr J
6,10911031
asked Nov 18 '18 at 7:23
Hitanshu GogoiHitanshu Gogoi
107110
edited Nov 18 '18 at 7:38
Barr J
6,10911031
asked Nov 18 '18 at 7:23
Hitanshu GogoiHitanshu Gogoi
107110
edited Nov 18 '18 at 7:38
Barr J
6,10911031
edited Nov 18 '18 at 7:38
Barr J
6,10911031
edited Nov 18 '18 at 7:38
Barr J
6,10911031
6,10911031
asked Nov 18 '18 at 7:23
Hitanshu GogoiHitanshu Gogoi
107110
asked Nov 18 '18 at 7:23
Hitanshu GogoiHitanshu Gogoi
107110
asked Nov 18 '18 at 7:23
Hitanshu GogoiHitanshu Gogoi
107110
107110
The JSON in your example is a List, not a Map. So, what is unclear to you?
– Andrey Turkovsky
Nov 18 '18 at 8:00
how can i get the list value
– Hitanshu Gogoi
Nov 18 '18 at 8:36
The issue is that you are getting JSON list and you are trying to pass it to constructor where is expected a Map. And also that you are passing multiple entities. You have to split the list in for cycle and create multiple objects from those entities inside. See the @AndreyTurkovsky solution, that is what you want!
– tenhobi
Nov 18 '18 at 9:12
add a comment |
The JSON in your example is a List, not a Map. So, what is unclear to you?
– Andrey Turkovsky
Nov 18 '18 at 8:00
how can i get the list value
– Hitanshu Gogoi
Nov 18 '18 at 8:36
The issue is that you are getting JSON list and you are trying to pass it to constructor where is expected a Map. And also that you are passing multiple entities. You have to split the list in for cycle and create multiple objects from those entities inside. See the @AndreyTurkovsky solution, that is what you want!
– tenhobi
Nov 18 '18 at 9:12
The JSON in your example is a List, not a Map. So, what is unclear to you?
– Andrey Turkovsky
Nov 18 '18 at 8:00
The JSON in your example is a List, not a Map. So, what is unclear to you?
– Andrey Turkovsky
Nov 18 '18 at 8:00
how can i get the list value
– Hitanshu Gogoi
Nov 18 '18 at 8:36
how can i get the list value
– Hitanshu Gogoi
Nov 18 '18 at 8:36
The issue is that you are getting JSON list and you are trying to pass it to constructor where is expected a Map. And also that you are passing multiple entities. You have to split the list in for cycle and create multiple objects from those entities inside. See the @AndreyTurkovsky solution, that is what you want!
– tenhobi
Nov 18 '18 at 9:12
The issue is that you are getting JSON list and you are trying to pass it to constructor where is expected a Map. And also that you are passing multiple entities. You have to split the list in for cycle and create multiple objects from those entities inside. See the @AndreyTurkovsky solution, that is what you want!
– tenhobi
Nov 18 '18 at 9:12
add a comment |
1 Answer
1
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List<Map<String, dynamic>> extractdata = json.decode(response.body);
for (map in extractdata) {
Student student = new Student.fromJson(map);
print(student.studentId);
print(map);
}
Somethimg like this
answered Nov 18 '18 at 9:06
Andrey TurkovskyAndrey Turkovsky
2,4222828
add a comment |
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1 Answer
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active
oldest
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oldest
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oldest
votes
1
List<Map<String, dynamic>> extractdata = json.decode(response.body);
for (map in extractdata) {
Student student = new Student.fromJson(map);
print(student.studentId);
print(map);
}
Somethimg like this
answered Nov 18 '18 at 9:06
Andrey TurkovskyAndrey Turkovsky
2,4222828
add a comment |
1
List<Map<String, dynamic>> extractdata = json.decode(response.body);
for (map in extractdata) {
Student student = new Student.fromJson(map);
print(student.studentId);
print(map);
}
Somethimg like this
answered Nov 18 '18 at 9:06
Andrey TurkovskyAndrey Turkovsky
2,4222828
add a comment |
1
1
1
List<Map<String, dynamic>> extractdata = json.decode(response.body);
for (map in extractdata) {
Student student = new Student.fromJson(map);
print(student.studentId);
print(map);
}
Somethimg like this
answered Nov 18 '18 at 9:06
Andrey TurkovskyAndrey Turkovsky
2,4222828
List<Map<String, dynamic>> extractdata = json.decode(response.body);
for (map in extractdata) {
Student student = new Student.fromJson(map);
print(student.studentId);
print(map);
}
Somethimg like this
answered Nov 18 '18 at 9:06
Andrey TurkovskyAndrey Turkovsky
2,4222828
answered Nov 18 '18 at 9:06
Andrey TurkovskyAndrey Turkovsky
2,4222828
answered Nov 18 '18 at 9:06
Andrey TurkovskyAndrey Turkovsky
2,4222828
answered Nov 18 '18 at 9:06
Andrey TurkovskyAndrey Turkovsky
2,4222828
2,4222828
add a comment |
add a comment |
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The JSON in your example is a List, not a Map. So, what is unclear to you?
– Andrey Turkovsky
Nov 18 '18 at 8:00
how can i get the list value
– Hitanshu Gogoi
Nov 18 '18 at 8:36
The issue is that you are getting JSON list and you are trying to pass it to constructor where is expected a Map. And also that you are passing multiple entities. You have to split the list in for cycle and create multiple objects from those entities inside. See the @AndreyTurkovsky solution, that is what you want!
– tenhobi
Nov 18 '18 at 9:12