Angular 2 | How to handle input type file in FormControl?

Question

Good day,

How can i handle input type file in formControl? im using reactive form but when i get the value of my form it returns null value on my

Answer 1

You need to write your own FileInputValueAccessor. Here is the plunker and the code:

@Directive({
  selector: 'input[type=file]',
  providers: [
    {
      provide: NG_VALUE_ACCESSOR,
      useExisting: FileValueAccessorDirective,
      multi: true
    }
  ]
})
export class FileValueAccessorDirective implements ControlValueAccessor {
  onChange;

  @HostListener('change', ['$event.target.value']) _handleInput(event) {
    this.onChange(event);
  }

  constructor(private element: ElementRef, private render: Renderer2) {  }

  writeValue(value: any) {
    const normalizedValue = value == null ? '' : value;
    this.render.setProperty(this.element.nativeElement, 'value', normalizedValue);
  }

  registerOnChange(fn) {    this.onChange = fn;  }

  registerOnTouched(fn: any) {  }

  nOnDestroy() {  }
}

And then you will be able to get updates like this:

@Component({
  moduleId: module.id,
  selector: 'my-app',
  template: `
      
Hello {{name}}
      
File path is: {{path}}
      
  `
})
export class AppComponent {
  name = 'Angular';
  path = '';
  ctrl = new FormControl('');

  ngOnInit() {
    this.ctrl.valueChanges.subscribe((v) => {
      this.path = v;
    });
  }
}