I have a Json data , I want to pass my json Districts id to next dropdown menu to show the Area's.
Now I can show the Districts data easily but, When I try to pass the districts value to next dropdown I found this error message==>
_AssertionError ('package:flutter/src/material/dropdown.dart': Failed assertion: line 894 pos 15: 'items == null || items.isEmpty || value == null ||
items.where((DropdownMenuItem<T> item) {
return item.value == value;
}).length == 1': There should be exactly one item with [DropdownButton]'s value: 4.
Either zero or 2 or more [DropdownMenuItem]s were detected with the same value)
This is my Districts DropDown menu button::
Container(
alignment: Alignment.centerLeft,
child: DropdownButton<int>(
value: districtsC.selectedValue,
icon: Icon(
Icons.arrow_drop_down,
color: black54,
),
dropdownColor: white,
focusColor: white,
items: districtsC.districtsList
.map((e) => districtsC.dataToMenuItem(e))
.toList(),
hint: KText(
text: 'Select Districts',
color: black,
),
onChanged: (int? value) {
setState(() {
districtsC.selectedValue = value;
print(value);
RestartWidget.restartApp(context);
});
},
),
),
This is my Areas DropDown menu button::
Container(
alignment: Alignment.centerLeft,
child: DropdownButton<int>(
value: areasC.selectedValue,
icon: Icon(
Icons.arrow_drop_down,
color: black54,
),
dropdownColor: white,
focusColor: white,
items: areasC.areaList
.map((e) => areasC.dataToMenuItem(e))
.toList(),
hint: KText(
text: 'Select Area',
color: black,
),
onChanged: (int? value) {
setState(() {
// RestartWidget.restartApp(context);
areasC.selectedValue = value;
print(value);
RestartWidget.restartApp(context);
});
},
),
),
This is my Districts Controller ::
import 'package:Darucheeni/src/configs/appConfigs.dart';
import 'package:Darucheeni/src/models/customerLocationModel/districsModel.dart';
import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import '../../configs/appColors.dart';
import '../../widgets/textWidget/kText.dart';
class DistrictsController extends GetxController {
final dio = Dio();
final districtsList = RxList<Districts>();
int? selectedValue;
getAllDistricts() async {
try {
final res = await dio.get(baseUrl + 'districts');
final List<Districts> districts = res.data['districts']
.map((json) => Districts.fromJson(json))
.toList()
.cast<Districts>();
print(res.data[['districts']]);
districtsList.clear();
districtsList.addAll(districts);
} catch (e) {
print(e);
}
}
DropdownMenuItem<int> dataToMenuItem(Districts item) {
return DropdownMenuItem(
child: KText(
text: '${item.name}',
color: black,
maxLines: 1,
fontSize: 16,
),
value: item.divisionId,
);
}
}
This is my Area's Controller ::
import 'package:Darucheeni/src/configs/appConfigs.dart';
import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import '../../configs/appColors.dart';
import '../../models/customerLocationModel/areasModel.dart';
import '../../widgets/textWidget/kText.dart';
import 'districController.dart';
class AreasController extends GetxController {
final dio = Dio();
final areaList = RxList<Areas>();
int? selectedValue;
final controller = Get.put(DistrictsController());
getAllArea() async {
try {
final res = await dio.get(baseUrl + 'areas/${controller.selectedValue}');
final List<Areas> areas = res.data['areas']
.map((json) => Areas.fromJson(json))
.toList()
.cast<Areas>();
print(res.data[['areas']]);
areaList.clear();
areaList.addAll(areas);
} catch (e) {
print(e);
}
}
DropdownMenuItem<int> dataToMenuItem(Areas item) {
return DropdownMenuItem(
child: KText(
text: '${item.area}',
color: black,
maxLines: 1,
fontSize: 16,
),
value: item.districtId,
);
}
}
This is my Json data ::
{
"districts": [
{
"id": 55,
"division_id": 4,
"name": "Bagerhat",
"bn_name": "বাগেরহাট",
"lat": "22.651568",
"lon": "89.785938",
"website": "www.bagerhat.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 40,
"division_id": 2,
"name": "Bandarban",
"bn_name": "বান্দরবান",
"lat": "22.1953275",
"lon": "92.2183773",
"website": "www.bandarban.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 34,
"division_id": 1,
"name": "Barguna",
"bn_name": "বরগুনা",
"lat": "0",
"lon": "0",
"website": "www.barguna.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 35,
"division_id": 1,
"name": "Barishal",
"bn_name": "বরিশাল",
"lat": "0",
"lon": "0",
"website": "www.barisal.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 36,
"division_id": 1,
"name": "Bhola",
"bn_name": "ভোলা",
"lat": "22.685923",
"lon": "90.648179",
"website": "www.bhola.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 18,
"division_id": 5,
"name": "Bogura",
"bn_name": "বগুড়া",
"lat": "24.8465228",
"lon": "89.377755",
"website": "www.bogra.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 41,
"division_id": 2,
"name": "Brahmanbaria",
"bn_name": "ব্রাহ্মণবাড়িয়া",
"lat": "23.9570904",
"lon": "91.1119286",
"website": "www.brahmanbaria.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 42,
"division_id": 2,
"name": "Chandpur",
"bn_name": "চাঁদপুর",
"lat": "23.2332585",
"lon": "90.6712912",
"website": "www.chandpur.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 22,
"division_id": 5,
"name": "Chapainawabganj",
"bn_name": "চাঁপাইনবাবগঞ্জ",
"lat": "24.5965034",
"lon": "88.2775122",
"website": "www.chapainawabganj.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 43,
"division_id": 2,
"name": "Chattogram",
"bn_name": "চট্টগ্রাম",
"lat": "22.335109",
"lon": "91.834073",
"website": "www.chittagong.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 56,
"division_id": 4,
"name": "Chuadanga",
"bn_name": "চুয়াডাঙ্গা",
"lat": "23.6401961",
"lon": "88.841841",
"website": "www.chuadanga.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 45,
"division_id": 2,
"name": "Cox's Bazar",
"bn_name": "কক্স বাজার",
"lat": "0",
"lon": "0",
"website": "www.coxsbazar.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 44,
"division_id": 2,
"name": "Cumilla",
"bn_name": "কুমিল্লা",
"lat": "23.4682747",
"lon": "91.1788135",
"website": "www.comilla.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 1,
"division_id": 3,
"name": "Dhaka",
"bn_name": "ঢাকা",
"lat": "23.7115253",
"lon": "90.4111451",
"website": "www.dhaka.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 26,
"division_id": 6,
"name": "Dinajpur",
"bn_name": "দিনাজপুর",
"lat": "25.6217061",
"lon": "88.6354504",
"website": "www.dinajpur.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 2,
"division_id": 3,
"name": "Faridpur",
"bn_name": "ফরিদপুর",
"lat": "23.6070822",
"lon": "89.8429406",
"website": "www.faridpur.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 46,
"division_id": 2,
"name": "Feni",
"bn_name": "ফেনী",
"lat": "23.023231",
"lon": "91.3840844",
"website": "www.feni.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 27,
"division_id": 6,
"name": "Gaibandha",
"bn_name": "গাইবান্ধা",
"lat": "25.328751",
"lon": "89.528088",
"website": "www.gaibandha.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 3,
"division_id": 3,
"name": "Gazipur",
"bn_name": "গাজীপুর",
"lat": "24.0022858",
"lon": "90.4264283",
"website": "www.gazipur.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 4,
"division_id": 3,
"name": "Gopalganj",
"bn_name": "গোপালগঞ্জ",
"lat": "23.0050857",
"lon": "89.8266059",
"website": "www.gopalganj.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 51,
"division_id": 7,
"name": "Habiganj",
"bn_name": "হবিগঞ্জ",
"lat": "24.374945",
"lon": "91.41553",
"website": "www.habiganj.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 5,
"division_id": 8,
"name": "Jamalpur",
"bn_name": "জামালপুর",
"lat": "24.937533",
"lon": "89.937775",
"website": "www.jamalpur.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 57,
"division_id": 4,
"name": "Jashore",
"bn_name": "যশোর",
"lat": "23.16643",
"lon": "89.2081126",
"website": "www.jessore.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 37,
"division_id": 1,
"name": "Jhalokati",
"bn_name": "ঝালকাঠি",
"lat": "0",
"lon": "0",
"website": "www.jhalakathi.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 58,
"division_id": 4,
"name": "Jhenaidah",
"bn_name": "ঝিনাইদহ",
"lat": "23.5448176",
"lon": "89.1539213",
"website": "www.jhenaidah.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 19,
"division_id": 5,
"name": "Joypurhat",
"bn_name": "জয়পুরহাট",
"lat": "0",
"lon": "0",
"website": "www.joypurhat.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 47,
"division_id": 2,
"name": "Khagrachhari",
"bn_name": "খাগড়াছড়ি",
"lat": "23.119285",
"lon": "91.984663",
"website": "www.khagrachhari.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 59,
"division_id": 4,
"name": "Khulna",
"bn_name": "খুলনা",
"lat": "22.815774",
"lon": "89.568679",
"website": "www.khulna.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 6,
"division_id": 3,
"name": "Kishoreganj",
"bn_name": "কিশোরগঞ্জ",
"lat": "24.444937",
"lon": "90.776575",
"website": "www.kishoreganj.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 28,
"division_id": 6,
"name": "Kurigram",
"bn_name": "কুড়িগ্রাম",
"lat": "25.805445",
"lon": "89.636174",
"website": "www.kurigram.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 60,
"division_id": 4,
"name": "Kushtia",
"bn_name": "কুষ্টিয়া",
"lat": "23.901258",
"lon": "89.120482",
"website": "www.kushtia.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 48,
"division_id": 2,
"name": "Lakshmipur",
"bn_name": "লক্ষ্মীপুর",
"lat": "22.942477",
"lon": "90.841184",
"website": "www.lakshmipur.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 29,
"division_id": 6,
"name": "Lalmonirhat",
"bn_name": "লালমনিরহাট",
"lat": "0",
"lon": "0",
"website": "www.lalmonirhat.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 7,
"division_id": 3,
"name": "Madaripur",
"bn_name": "মাদারীপুর",
"lat": "23.164102",
"lon": "90.1896805",
"website": "www.madaripur.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 61,
"division_id": 4,
"name": "Magura",
"bn_name": "মাগুরা",
"lat": "23.487337",
"lon": "89.419956",
"website": "www.magura.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 8,
"division_id": 3,
"name": "Manikganj",
"bn_name": "মানিকগঞ্জ",
"lat": "0",
"lon": "0",
"website": "www.manikganj.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 62,
"division_id": 4,
"name": "Meherpur",
"bn_name": "মেহেরপুর",
"lat": "23.762213",
"lon": "88.631821",
"website": "www.meherpur.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 52,
"division_id": 7,
"name": "Moulvibazar",
"bn_name": "মৌলভীবাজার",
"lat": "24.482934",
"lon": "91.777417",
"website": "www.moulvibazar.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 9,
"division_id": 3,
"name": "Munshiganj",
"bn_name": "মুন্সিগঞ্জ",
"lat": "0",
"lon": "0",
"website": "www.munshiganj.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 10,
"division_id": 8,
"name": "Mymensingh",
"bn_name": "ময়মনসিংহ",
"lat": "0",
"lon": "0",
"website": "www.mymensingh.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 20,
"division_id": 5,
"name": "Naogaon",
"bn_name": "নওগাঁ",
"lat": "0",
"lon": "0",
"website": "www.naogaon.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 63,
"division_id": 4,
"name": "Narail",
"bn_name": "নড়াইল",
"lat": "23.172534",
"lon": "89.512672",
"website": "www.narail.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 11,
"division_id": 3,
"name": "Narayanganj",
"bn_name": "নারায়াণগঞ্জ",
"lat": "23.63366",
"lon": "90.496482",
"website": "www.narayanganj.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 12,
"division_id": 3,
"name": "Narsingdi",
"bn_name": "নরসিংদী",
"lat": "23.932233",
"lon": "90.71541",
"website": "www.narsingdi.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 21,
"division_id": 5,
"name": "Natore",
"bn_name": "নাটোর",
"lat": "24.420556",
"lon": "89.000282",
"website": "www.natore.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 13,
"division_id": 8,
"name": "Netrokona",
"bn_name": "নেত্রকোণা",
"lat": "24.870955",
"lon": "90.727887",
"website": "www.netrokona.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 30,
"division_id": 6,
"name": "Nilphamari",
"bn_name": "নীলফামারী",
"lat": "25.931794",
"lon": "88.856006",
"website": "www.nilphamari.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 49,
"division_id": 2,
"name": "Noakhali",
"bn_name": "নোয়াখালী",
"lat": "22.869563",
"lon": "91.099398",
"website": "www.noakhali.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 23,
"division_id": 5,
"name": "Pabna",
"bn_name": "পাবনা",
"lat": "23.998524",
"lon": "89.233645",
"website": "www.pabna.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 31,
"division_id": 6,
"name": "Panchagarh",
"bn_name": "পঞ্চগড়",
"lat": "26.3411",
"lon": "88.5541606",
"website": "www.panchagarh.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 38,
"division_id": 1,
"name": "Patuakhali",
"bn_name": "পটুয়াখালী",
"lat": "22.3596316",
"lon": "90.3298712",
"website": "www.patuakhali.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 39,
"division_id": 1,
"name": "Pirojpur",
"bn_name": "পিরোজপুর",
"lat": "0",
"lon": "0",
"website": "www.pirojpur.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 14,
"division_id": 3,
"name": "Rajbari",
"bn_name": "রাজবাড়ি",
"lat": "23.7574305",
"lon": "89.6444665",
"website": "www.rajbari.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 17,
"division_id": 3,
"name": "Tangail",
"bn_name": "টাঙ্গাইল",
"lat": "0",
"lon": "0",
"website": "www.tangail.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
},
{
"id": 33,
"division_id": 6,
"name": "Thakurgaon",
"bn_name": "ঠাকুরগাঁও",
"lat": "26.0336945",
"lon": "88.4616834",
"website": "www.thakurgaon.gov.bd",
"status": 1,
"created_at": null,
"updated_at": null
}
]
}
I want to pass the districts api "division_id" to Area's Api and the "name": to pass in backend...
DropDown Like this ====>
This is I already created==> I just pass dropdown value to area api
