Cascading or Dependent Dropdown List [country/state/city] in Angular 6/7

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Tue Sep 05 2023 15:35:36 GMT+0000 (Coordinated Universal Time)

Saved by @dayalalok #ts #angular

import { Component, OnInit } from '@angular/core';
import { FormGroup, FormControl } from '@angular/forms';
import { CscService } from '../csc.service';

@Component({
  selector: 'app-create-account',
  templateUrl: './create-account.component.html',
  styleUrls: ['./create-account.component.css']
})
export class CreateAccountComponent implements OnInit {

  createAccountForm: FormGroup;
  countries: {};
  states: {};
  cities: {};

  constructor(private cscService: CscService) { }

  ngOnInit() {
    this.cscService.getCountries().subscribe(
      data => this.countries = data
    );

    this.createAccountForm = new FormGroup({
      country: new FormControl(''),
      state: new FormControl(''),
      city: new FormControl('')
    });
  }

  onChangeCountry(countryId: number) {
    if (countryId) {
      this.cscService.getStates(countryId).subscribe(
        data => {
          this.states = data;
          this.cities = null;
        }
      );
    } else {
      this.states = null;
      this.cities = null;
    }
  }

  onChangeState(stateId: number) {
    if (stateId) {
      this.cscService.getCities(stateId).subscribe(
        data => this.cities = data
      );
    } else {
      this.cities = null;
    }
  }

}

Component .ts file for Country, State, City Cascading Dropdown

https://www.truecodex.com/course/angular-6/cascading-or-dependent-dropdown-list-country-state-city-in-angular-6-7

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