What is the reason that Ionic Lifecycle hooks (such as ionViewWillEnter and ionViewWillLeave) do not trigger when utilized as an HTML Selector?

I have a project using Angular along with Ionic 4. I encountered an issue where the Ionic Lifecycle Hooks in the child page do not fire when it is called from the parent page's HTML using the HTML Selector.

Why does this happen? How can I properly utilize these hooks?

Child Page:

@Component({
  selector: 'app-child',
  templateUrl: './child.page.html',
  styleUrls: ['./child.page.scss']
})

export class ChildPage {

     ionViewWillEnter() {
         console.log(`ionView-Will-Enter`);
         // Code goes here...
     }

     ionViewWillLeave() {
         console.log(`ionView-Will-Leave`);
         // Code goes here...
     }
}

Parent HTML:

<ng-container>
    <app-child></app-child>
</ng-container>    

Answer №1

When it comes to Ionic Page lifecycles, they are executed on routing components making routes essential for their functionality. Check it out here.

Additionally, you have the option to utilize Angular lifecycle hooks in this scenario.

It's important to note that components/pages can be loaded into your template either through selectors or via routes.

EDIT:

For testing purposes, feel free to explore this StackBlitz example. Take note of the logs generated by the execution of Angular example component lifecycle hook OnInit and the Ionic pages lifecycles.

I've included logs for ngOnInit, ngAfterViewInit, and ngOnDestroy Angular lifecycle hooks in the StackBlitz. You'll notice everything works smoothly and may meet your requirements.

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