Quelltext der Seite Custom Select Component (AngularForm)

<pre>
import { Component, OnInit, forwardRef, Input } from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';

import { VideoArchiveService } from 'src/app/shared/video-archive.service';

@Component({
  selector: 'vac-actor-country-combo-box',
  templateUrl: './actor-country-combo-box.component.html',
  styleUrls: ['./actor-country-combo-box.component.css'],
  providers: [
    {
      provide: NG_VALUE_ACCESSOR,
      useExisting: forwardRef(() => ActorCountryComboBoxComponent),
      multi: true
    }
  ]
})
export class ActorCountryComboBoxComponent implements OnInit, ControlValueAccessor {
  @Input()
  name: string;

  // tslint:disable-next-line:no-input-rename
  @Input('value')
  val: string;

  isDisabled: boolean;

  private countries: string[];

  onChange: any = () => { };
  onTouched: any = () => { };

  constructor(
    private videoService: VideoArchiveService
  ) { }

  ngOnInit() {
    this.videoService.getActorCountries().subscribe(countries => this.countries = countries);
  }

  get value() {
    return this.val;
  }

  set value(val) {
    this.val = val;
    this.onChange(val);
    this.onTouched();
  }

  writeValue(value: any): void {
    if (value) {
      this.val = value;
    } else {
      this.val = '';
    }
  }

  registerOnChange(fn: any): void {
    this.onChange = fn;
  }

  registerOnTouched(fn: any): void {
    this.onTouched = fn;
  }

  setDisabledState(isDisabled: boolean) {
    this.isDisabled = isDisabled;
  }
}
</pre>

<pre>
<select *ngIf=isDisabled [name]="name" [(ngModel)]="value" disabled>
  <option value=""></option>
  <option *ngFor="let country of countries" [value]="country">{{country}}</option>
</select>
<select *ngIf=!isDisabled [name]="name" [(ngModel)]="value">
  <option value=""></option>
  <option *ngFor="let country of countries" [value]="country">{{country}}</option>
</select>
</pre>


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