Add placeholder to select tag in angular2

Question

I have simple component that contains only form:

import {Component, FORM_DIRECTIVES, NgFor} from \'angular2/angular2\';


@Component({
  selector: \'test-com         


        

Answer 1

    searchByRegion
    All
    Asia
    Europe
    Africa
    Australia


this [ngValue]="undefined" is very important in 2nd line