angular - Angular2 NgModel ViewModel -

i trying create directive convert number percentage example

number / 100

but don't want user see example 5/100 = 0.05 in model want see 5

this example: user sees 5.12/ it's value send in backend should changed 5.12/100

my code looks this

import { directive, hostlistener, elementref, oninit  }   '@angular/core'; import { ngmodel } '@angular/forms';  @directive({   selector: '[topercentage]',   providers: [ngmodel] }) export class topercentagedirective implements oninit {    constructor(private element: elementref,            private ngmodel: ngmodel) { }   ngoninit() {      console.log("init");       this.ngmodel.valuechanges.subscribe(function (value){       var percent = value / 100;       $(this.element.nativeelement).data("newvalue",percent);       console.log(percent)     });    $(this.element.nativeelement).bind("customevent", function(newval){      this.ngmodel.update.emit(newval);  }); 

}

how achieve ?

when comes backend multiplied *100 , when goes backend divided /100