dropdown selected item

import 'dart:convert';
import 'package:date_time_picker/date_time_picker.dart';
import 'package:flutter/material.dart';
import 'AllPathLabTestModel.dart';
import 'package:http/http.dart' as http;

import 'Dependent_DropDown_in_MultipleTest_Model.dart';

class MultipleTestBooking extends StatefulWidget {
  const MultipleTestBooking({Key? key}) : super(key: key);

  @override
  _MultipleTestBookingState createState() => _MultipleTestBookingState();
}

class _MultipleTestBookingState extends State<MultipleTestBooking> {


  String encLabId = '';


  void initState(){
  super.initState();
  AllPathLab();
}



  String _selectedDate = DateTime.now().toString();
  final List<String> allLabList = [
    "Select Lab",
    "Abc",
    "Xyz",
  ];
  String selectedLabFromList = "Abc";

  @override
  Widget build(BuildContext context) {
    var screenWidth = MediaQuery.of(context).size.width;
    var screenHeight = MediaQuery.of(context).size.height;
    var blockSizeHorizontal = (screenWidth / 100);
    var blockSizeVertical = (screenHeight / 100);

    return Scaffold(
      body: SafeArea(
        child: Container(
          child: Column(
            children: [
              Padding(
                padding: const EdgeInsets.all(8.0),
                child: ListTile(
                  title: Text("Booking Information",
                      style: TextStyle(
                        fontWeight: FontWeight.bold,
                        fontSize: blockSizeHorizontal * 5,
                        fontFamily: 'Poppins',
                        color: Theme.of(context).primaryColor,
                      )),
                  subtitle: Text("Preferred Visit Date"),
                ),
              ),
              //==============================================================================
              Container(
                margin: EdgeInsets.only(left: 20),
                padding: EdgeInsets.only(left: 0, right: 150),
                decoration: BoxDecoration(
                  color: Colors.lightBlue[50],
                  borderRadius: BorderRadius.all(Radius.circular(12)),

                ),
                child: Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: DateTimePicker(
                    initialValue: DateTime.now().toString(),
                    //initialValue:'', // initialValue or controller.text can be null, empty or a DateTime string otherwise it will throw an error.
                    type: DateTimePickerType.date,
                    dateLabelText: 'Select Date',
                    style: TextStyle(
                      fontWeight: FontWeight.bold,
                      fontSize: blockSizeHorizontal * 3.5,
                      fontFamily: 'Poppins',
                      color: Colors.green,
                      letterSpacing: 2.0,
                    ),
                    firstDate: DateTime.now(),
                    lastDate: DateTime.now().add(Duration(
                        days: 30)), // This will add one year from current date
                    validator: (value) {
                      return null;
                    },
                    onChanged: (value) {
                      if (value.isNotEmpty) {
                        setState(() {
                          _selectedDate = value;
                        });
                      }
                    },
                    onSaved: (value) {
                      if (value.isNotEmpty) {
                        _selectedDate = value;
                      }
                    },
                  ),
                ),
              ),

              //==============================================================================


                            ListTile(
                                title: Text(
                                  "Select Pathological Lab",
                                  style: TextStyle(
                                    fontWeight: FontWeight.bold,
                                    fontSize: blockSizeHorizontal * 4.0,
                                    fontFamily: 'Poppins',
                                    color: Theme.of(context).primaryColor,
                                  ),
                                ),
                              ),


               Container(
                      child: FutureBuilder<List<Partner>>(
                        future: AllPathLab(),
                        builder:
                            (BuildContext context, AsyncSnapshot snapshot) {
                          if (snapshot.connectionState !=ConnectionState.done) {
                            return CircularProgressIndicator();
                          }
                          if (snapshot.hasError) {
                            return Text("Somthing went wrong");
                          }

                          if (snapshot.hasData) {
                            return DropdownButton<Partner>(
                              value: _val,
                              hint: Text("Select Lab"),
                        //underline: SizedBox(),
                        //isExpanded: true,
                        items: snapshot.data.map((Partner data) =>
                        DropdownMenuItem<Partner>(
                          child: Text("${data.partnerName}"),
                        value: data,
                        )
                          ).toList().cast<DropdownMenuItem<Partner>>(),
                          onChanged: (value){
                            setState(() {
                              _val=value;
                              encLabId = value!.encPartnerId;
                              GetTestByLab(); 
                            });


                          });
                              
                            }
                          return Text("Waiting for Internet Connection");
                        },
                      ),
                    ),

                    //=========================================================== Dependent drop down===================================


                         ListTile(
                                title: Text(
                                  "Test Name",
                                  style: TextStyle(
                                    fontWeight: FontWeight.bold,
                                    fontSize: blockSizeHorizontal * 4.0,
                                    fontFamily: 'Poppins',
                                    color: Theme.of(context).primaryColor,
                                  ),
                                ),
                              ),

                    Container(
                      child: FutureBuilder<List<Datum>>(
                        future: GetTestByLab(),
                        builder:
                            (BuildContext context, AsyncSnapshot snapshot) {
                          if (snapshot.connectionState !=ConnectionState.done) {
                            return CircularProgressIndicator();
                          }
                          if (snapshot.hasError) {
                            return Text("Somthing went wrong");
                          }

                          if (snapshot.hasData) {
                            return DropdownButton<Datum>(
                              hint: Text(""),
                        //underline: SizedBox(),
                        //isExpanded: true,
                        items: snapshot.data.map((Datum data) =>
                        DropdownMenuItem<Datum>(
                          child: Text("${data.testName}"),
                        value: data,
                        )
                          ).toList().cast<DropdownMenuItem<Datum>>(),
                          onChanged: (value){
                            //GetTestByLab(value!.encPartnerId); // passing encid to my next API function

                          });
                              
                            }
                          return Text("Waiting for Internet Connection");
                        },
                      ),
                    ),










             
            ],
          ),
        ),
      ),
    );
  }
  //==========================================================================================================================================================================



  Future<List<Partner>> AllPathLab() async {
    var jsonResponse;
  
      var response = await http.post(Uri.parse("http://medbo.digitalicon.in/api/medboapi/AllPathLab"),
          body: ({
            
          }));
      if (response.statusCode == 200) {
        print("Correct");
        // print(response.body);
        jsonResponse = json.decode(response.body.toString());
        print(jsonResponse);

        AllPathLabTestModel dataModel = allPathLabTestModelFromJson(response.body);
        print(dataModel.partner.length);
        for (final item in dataModel.partner) {
        print(item.partnerName);
 
        
        }

        List<Partner> arrData = dataModel.partner; // this "partner" is actual json array of data[]
        return arrData;
      } else {
        print("Wrong URL");
        throw Exception("Faild to fetch");
      }
    
  }


//==========================================================================================================================================================================



  Future<List<Datum>> GetTestByLab() async {
    var jsonResponse;
  
      var response = await http.post(Uri.parse("http://medbo.digitalicon.in/api/medboapi/GetTestByLab"),
          body: ({
            "EncId": encLabId
            //"EncId": 'I3uXyzcuDZf21SSe5fHnSQ=='
          }));
      if (response.statusCode == 200) {
        print("Correct");
        // print(response.body);
        jsonResponse = json.decode(response.body.toString());
        print(jsonResponse);

        DependentDropDownModel dataModel = dependentDropDownModelFromJson(response.body);
        print(dataModel.data.length);
        for (final item in dataModel.data) 
        print(item.testName);
       // print(item.testId);

        List<Datum> arrData = dataModel.data; // this "partner" is actual json array of data[]
        return arrData;
      } else {
        print("Wrong URL");
        throw Exception("Faild to fetch");
      }
    
  }





}