Nativescript - ChangeDetectorRef does not exist in my component

Question

I try to automatically update an array used in a Listview. To do that, I use ChangeDetectorRef like this :

import { Component, OnInit, ChangeDetectionStrategy, Input, ChangeDetectorRef } from "@angular/core";

@Component({
    selector: "register",
    templateUrl: "./register.html",
    styleUrls: ["./register.css"],
    changeDetection: ChangeDetectionStrategy.OnPush
})

export class RegisterComponent implements OnInit {

@Input regis = Array<string>;

constructor(cdr: ChangeDetectorRef){}

ngAfterContentChecked() {
    this.cdr.detectChanges();
}

However, I get this error :

error TS2339: Property 'cdr' does not exist on type 'RegisterComponent'.

Could someone explain me what I misunderstood ?

Answer 1

It's a local variable within constructor until you add a accessor like public / private.

import { Component, OnInit, ChangeDetectionStrategy, Input, ChangeDetectorRef } from "@angular/core";

@Component({
    selector: "register",
    templateUrl: "./register.html",
    styleUrls: ["./register.css"],
    changeDetection: ChangeDetectionStrategy.OnPush
})

export class RegisterComponent implements OnInit {

@Input regis = Array<string>;

constructor(private cdr: ChangeDetectorRef){}

ngAfterContentChecked() {
    this.cdr.detectChanges();
}