javascript – Angular 2 Custom Validator：检查输入值是否为整数？

app.component.html：

<input formControlName="mynumber">

app.component.ts：

export class AppComponent {
    mynumber:FormControl

    constructor(private _Validatorsservice: ValidatorsservicE){
    }

    this.mynumber= new FormControl('DefaultValue',[ Validators.required,this._Validatorsservice.isInteger ]);
}

validators.service.ts：

function check_if_is_Integer(value){
   if((parseFloat(value) == parseInt(value)) && !isNaN(value)){ 
      // I can have spacespacespace1 - which is 1 and validators pases but
      // spacespacespace doesn't - which is what i wanted.
      // 1space2 doesn't pass - good
      // of course,when saving data you do another parseInt.
       return true;
   } else {
       return false;
   }
}

@Injectable()
export class Validatorsservice {

   public isInteger = (control:FormControl) => {
        return check_if_is_Integer(control.value) ? null : {
           notNumeric: true
        }
   }

}

请享用！