rog_app/lib/widgets/perfecture_widget.dart

import 'package:flutter/material.dart';
import 'package:geojson/geojson.dart';
import 'package:get/get.dart';
import 'package:rogapp/pages/home/home_controller.dart';



class PerfectureWidget extends StatefulWidget {

  HomeController homeController;

  PerfectureWidget({required this.homeController});

  @override
  State<PerfectureWidget> createState() => _PerfectureWidgetState();
}

class _PerfectureWidgetState extends State<PerfectureWidget> {
  String dropdownValue = "1";  

  List<DropdownMenuItem<String>> getDropdownItems() {
    List<DropdownMenuItem<String>> dropDownItems = [];

    for (Map<String, dynamic> currency in widget.homeController.perfectures[0]) {
      //print(currency["id"].toString());
      var newDropdown = DropdownMenuItem(
        child: Text(currency["adm1_ja"].toString()),
        value: currency["id"].toString(),
      );

      dropDownItems.add(newDropdown);
    }
    return dropDownItems;
  }

  List<DropdownMenuItem<String>> getSubDropdownItems() {
    List<DropdownMenuItem<String>> dropDownItems = [];
    if(widget.homeController.subPerfs.length > 0){
      for (Map<String, dynamic> currency in widget.homeController.subPerfs[0]) {
      //print(currency["id"].toString());
      var newDropdown = DropdownMenuItem(
        child: Text(currency["adm2_l"].toString()),
        value: currency["id"].toString(),
      );

      dropDownItems.add(newDropdown);
    }
    }
    return dropDownItems;
  }



  @override
  Widget build(BuildContext context) {
    return Obx(() =>
      Row(
        children: [
          DropdownButton<String>(
      value: dropdownValue,
      icon: const Icon(Icons.arrow_downward),
      elevation: 16,
      style: const TextStyle(color: Colors.deepPurple),
      underline: Container(
        height: 2,
        color: Colors.deepPurpleAccent,
      ),
      onChanged: (String? newValue) {
        setState(() {
          dropdownValue = newValue!;
          print(newValue);
          widget.homeController.loadLocationforPerf(newValue);
          widget.homeController.loadSubPerfFor(newValue);
        });
      },
      items:getDropdownItems()),
      
      widget.homeController.subPerfs.length > 0 ?

      DropdownButton<String>(
      value: widget.homeController.getSubInitialVal(),
      icon: const Icon(Icons.arrow_downward),
      elevation: 16,
      style: const TextStyle(color: Colors.deepPurple),
      underline: Container(
        height: 2,
        color: Colors.deepPurpleAccent,
      ),
      onChanged: (String? newValue) {
        setState(() {
          dropdownValue = newValue!;
          print(newValue);
          //widget.homeController.loadLocationforPerf(newValue);
        });
      },
      items:getSubDropdownItems()) :
      Text("--")

        ],
      )
    );
  }
}