call parameter function to get data in flutter - flutter

Question

I'm learning and trying to add parameters when calling parameters in functions when getting data from the API, but I'm a bit confused about how I call them in widgets.
static Future<Map<String, DataKuliahModel>> getDataKuliah(String smt) async {
String url = Constant.baseURL;
String token = await UtilSharedPreferences.getToken();
await Future.delayed(const Duration(milliseconds: 1000));
// String responseJson = await rootBundle.loadString('assets/1.json');
Map<String, DataKuliahModel> finalResult = {};
final response = await http.get(
Uri.parse(
'$url/auth/mhs_siakad/perwalian/get_paket',
),
headers: {
'Authorization': 'Bearer $token',
},
);
final result = jsonDecode(response.body)['data'] as Map<String, dynamic>;
result.forEach((key, value) {
DataKuliahModel dataKuliah = DataKuliahModel.fromMap(value);
finalResult.addAll({
key: dataKuliah,
});
});
return finalResult;
}
and I want to call him here

Answer 1

When you declare a function with positional parameters you need to provide those parameters when you call that function.
import 'package:flutter/material.dart';
class Services {
static Future<String> greeting(String name) async {
/// this function doesn't need to be Future
/// but when you call API to get some data it should be a Future
return 'Hello $name';
}
}
class MyWidget extends StatelessWidget {
const MyWidget({super.key});
#override
Widget build(BuildContext context) {
return FutureBuilder(
/// pass positional parameter to [greeting] here
future: Services.greeting('Dash'),
builder: (context, AsyncSnapshot<String> snapshot) {
return Center(
child: Text(snapshot.data ?? 'default'),
);
},
);
}
}
Result: Hello Dash
In your case smt seems to be an int not a String
and you have to pass it as query parameter to http request as follows
static Future<Map<String, DataKuliahModel>> getDataKuliah(int smt) async {
String url = Constant.baseURL;
String token = await UtilSharedPreferences.getToken();
await Future.delayed(const Duration(milliseconds: 1000));
// String responseJson = await rootBundle.loadString('assets/1.json');
Map<String, DataKuliahModel> finalResult = {};
final response = await http.get(
// Uri.parse(
// '$url/auth/mhs_siakad/perwalian/get_paket',
// ),
Uri.http(url, '/auth/mhs_siakad/perwalian/get_paket',
{'smt':smt}),
headers: {
'Authorization': 'Bearer $token',
},
);
final result = jsonDecode(response.body)['data'] as Map<String, dynamic>;
result.forEach((key, value) {
DataKuliahModel dataKuliah = DataKuliahModel.fromMap(value);
finalResult.addAll({
key: dataKuliah,
});
});
return finalResult;
}

Answer 2

Have you looked at the Uri replace method?
You can do the following:
Uri.parse('$url/auth/mhs_siakad/perwalian/get_paket').replace(queryParameters:{ "smt":"$smt"});
Update on FutureBuilder:
// Put this outside your build function
Future<Map<String, DataKuliahModel>> DK ;
// Put this in your initState if you want the future to run on page load or use it for events like onTap
DK = Service.getDataKuliah(<PARAM>);
// This is in your build method
FutureBuilder(
future:DK,
builder: (context, snapshot) {
// add wigets to display results here
}
)