Angular 8 value won't update on view after change

Question

I have a small component in Angular with a method that (for now) sets a timeout and changes the value of a variable.

import { Component, ChangeDetectionStrategy } from '@angular/core';

@Component({
  selector: 'my-component',
  templateUrl: './my-view.html',
  styleUrls: ['./my-view.scss'],
  changeDetection: ChangeDetectionStrategy.Default
})
export class MyComponent {

  status: boolean = false;

  changeStatus(): void {

    setTimeout(() => {
      this.status = true;
    }, 1500);
  }
}

And the HTML

<div>
  <form #myForm="ngForm">
    <input name="code" type="text" class="form-control" [(ngModel)]="code" #codeInput="ngModel" required placeholder="Enter your code" />
  </form>
</div>

<div class="row">
  <div class="col-md-5" (click)="changeStatus()">
    <mat-icon aria-label="clear-all" *ngIf="!status">&#xe042;</mat-icon>
    <a>Change status</a>
  </div>
  <div class="col-md-7">
    <button type="button" class="btn-flat app-btn-flat">Cancel</button>
    <button type="button" class="btn app-btn" [disabled]="myForm.invalid || myForm.pristine">Save</button>
  </div>
</div>

If I log the value of 'status' in the component. I get the new value of 'true' but it won't change on the view unless I focus the cursor on the input and then click anywhere outside it.

Why is that happening? how can I solve it?

Answer 1

Why is that happening?

You set changeDetection to OnPush in one of the ancestor component. That property cannot be overridden. Ref: https://angular.io/api/core/ChangeDetectionStrategy

how can I solve it?

Unset changeDetection in the ancestor component, or manually detect changes like Adam's answer.

constructor(private _cdr: ChangeDetectorRef) {}

changeStatus(): void {
  setTimeout(() => {
    this.status = true;
    this._cdr.detectChanges()
  }, 1500);
}