How to count characters in keyup in angular 6

Question

how do you count characters including space in keyup event in angular 6?

import { Component } from '@angular/core';
@Component({
  selector: 'app-loop-back',
  template: `
    <input #box (keyup)="0">
    <p>{{box.value}}</p>
  `
})
export class LoopbackComponent { }

Answer 1

You can count character by box.value.length or box.value?.length

? after the property will check for undefined..