CODEWITHSUNDEEP
angulardrop-down-menuangular-reactive-formscascadingdropdown
Sherif El Sherif
Sherif El Sherif

Reputation: 89

Cascade Dropdown in Angular Reactive Form

For the cascading dropdown, On changing the country, the state value must be reset.
How can i achieve that ?
This is what i did
demo

Upvotes: 0

Views: 1789

Answers (1)

Juan Vicente Berzosa Tejero
Juan Vicente Berzosa Tejero

Reputation: 3022

I leave you HERE your fork working as you need.

All you have todo do is subscribe to the changes of the 'Country' field with valueChanges, something like what I do here with the formFieldCountryValueChanges$ Observable:

private formFieldCountryValueChanges$: Observable<any>;

ngOnInit() {
    this.myForm = this.formBuilder.group({
      Country: ['', [Validators.required]],
      State: ['', [Validators.required]],
    });

    this.countries = this.selectService.getCountries();

    this.formFieldCountryValueChanges$ = this.myForm
      .get('Country')
      .valueChanges.pipe(
        tap((_arrayStates) => {
          this.myForm.patchValue({ State: '' });
          return _arrayStates;
        })
      );
    this.formFieldCountryValueChanges$.subscribe();
  }

Upvotes: 5

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