I wrote a code that should remove a Document from my Firestore Database. It works manually, but it should also work when the user closes the tab with the angular app or when refreshing it. Is there a way to do it?

I tried to call my remove method with ngOnDestroy(), but it doesn't work. After closing or refreshing the tab with the angular app, my document is still in my Firestore Database.

Thank you for helping!

CodePudding user response：

There are a few ways you can handle this in your Angular app:

1. You can use the beforeunload event to detect when the user is closing the tab or navigating away from the page. In the event handler for this event, you can call your remove method to delete the document from the Firestore database. Here's an example of how you can do this:

@HostListener('window:beforeunload', ['$event'])
unloadHandler(event: Event) {
  // Call your remove method here
  event.returnValue = false;
}

2. Another option is to use the ngOnDestroy lifecycle hook to clean up any subscriptions or resources when the component is destroyed. You can call your remove method in the ngOnDestroy method to delete the document from the Firestore database. Here's an example of how you can do this:

ngOnDestroy() {
  // Call your remove method here
}

Keep in mind that the ngOnDestroy method will only be called when the component is being destroyed as part of the Angular application, not when the user closes the tab or refreshes the page.

3. You can also consider using the PWA (Progressive Web App) feature in Angular to make your app work offline and handle the deletion of the document when the user comes back online. I hope this helps! Let me know if you have any questions.