preventing letters from being placed in an input ts

1  validateNumber(event) {
2    const keyCode = event.keyCode;
3
4    const excludedKeys = [8, 37, 39, 46];
5
6    if (!((keyCode >= 48 && keyCode <= 57) ||
7      (keyCode >= 96 && keyCode <= 105) ||
8      (excludedKeys.includes(keyCode)))) {
9      event.preventDefault();
10    }
11  }
12

1<input type="password" placeholder="Enter Mobile no" formControlName="mobile_no" (keydown)="validateNumber($event)">
2