ngBackAndForthMultipleInputs.ts

    onEdit($event: Event) {
        if( $event instanceof KeyboardEvent ) {
            let key = ($event.keyCode || $event.charCode);
            let maxLength = ($event.target as HTMLInputElement).maxLength;
            let valueLength = ($event.target as HTMLInputElement).value.length;
            if(maxLength === valueLength) {
                let index = this.inputs.map(e => e.nativeElement)
                    .findIndex(e => e === $event.target);
                let next = (index + 1) > (this.inputs.length - 1) ? (this.inputs.length - 1) : (index + 1);
                (this.inputs[next].nativeElement as HTMLInputElement).focus();
            }

            if( (key == 8 || key == 46) && valueLength == 0 ){
                let index = this.inputs.map(e => e.nativeElement)
                        .findIndex(e => e === $event.target);
                let prev = (index - 1) == -1 ? 0 : (index - 1);
                (this.inputs[prev].nativeElement as HTMLInputElement).focus();
            }
        } else if ( $event instanceof FocusEvent ) {
        }
        //var value = this.editor.nativeElement.textContent;
        this.update.emit(this.val);
    }

// (keyup)="onEdit($event)"