event onchange mat-option in mat-select by arrows in angular

 

  getCities(item: any) {
    this.cities = [];
    for (let element of item.states) {
      this.cities.push(element);
    }
  }

  _getCities(event: any) {
    if (event.value) {
      this.cities = this.countries.find(element => { return element.iso2 === event.value }).states;
    }
  }


                        <!-- الدولة -->
                        <div fxFlex="50" fxLayout="column" fxLayoutAlign="space-between center">
                            <!-- الجنسية: من هنا يمكنك استدعاء أعلام البلدان https://flagcdn.com/ua.svg -->
                            <mat-form-field class="w-95" appearance="outline">
                                <mat-label>{{'LABELS.COUNTRY' | translate}}</mat-label>
                                <mat-select [(ngModel)]="data.country" (selectionChange)="_getCities($event)"
                                    (keydown)="_getCities($event)" [placeholder]="'PLACEHOLDERS.COUNTRY' | translate"
                                    formControlName="country">
                                    <mat-option *ngFor="let item of countries" (click)="getCities(item)"
                                        (change)="getCities(item)" [value]="item.iso2">
                                        <img alt="{{item.iso2}}" class="example-option-img"
                                            [src]="'https://flagcdn.com/' + item.iso2.toLowerCase() + '.svg'"
                                            height="25" width="30">
                                        <span class="mx-2">{{'COUNTRIES.'+ item.iso2 | translate}}</span>
                                    </mat-option>
                                </mat-select>
                                <mat-icon *ngIf="data.country" matSuffix class="icon-edit">
                                    <img alt="{{data.country}}" class="example-option-img"
                                        [src]="'https://flagcdn.com/' + data.country.toLowerCase() + '.svg'" height="25"
                                        width="30">
                                </mat-icon>
                                <mat-error *ngIf="secondForm.controls.country.errors?.required">
                                    {{'ERRORS.REQUIRED' | translate}}
                                </mat-error>
                            </mat-form-field>
                        </div>













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