How can I prevent Firebase from listening to changes in Framework 7 Vue when navigating between pages?

Assume I have a page called pageA where I am monitoring changes to a firebase document.

export default {
  mounted() {
    this.$f7ready(() => {
      this.userChanges();
    })
  },
  methods: {
    userChanges() {
      Firebase.database().ref('users/1').on('value', (resp) => {
        console.log('user data has changed');
      });
    }
  }
}

Next, I navigate to another page called pageB using

this..$f7.views.current.router.navigate('/pageB/')

When I modify the data in the /users/1 firebase route while on pageB, the message user data has changed appears in the console, even though I am on a different page.

Is there a way to prevent this behavior? Perhaps by unloading the page somehow?

I attempted to stop the listener before leaving pageA using Firebase.off(), but that caused some other issues.

Answer №1

Have you ensured that you are correctly removing the listener for a specific database reference? It is important to store the path of the reference in a separate variable in order to detach the listener properly:

let userRef
export default {
    mounted() {
        this.$f7ready(() => {
            this.userChanges();
        })
    },
    methods: {
        userChanges() {
            userRef = Firebase.database().ref('users/1')
            userRef.on('value', (resp) => {
                console.log('use data has changed');
            });
        },
        detachListener() {
            userRef.off('value')
        }
    }
}

This way, you can specifically detach the listener for that particular reference. Removing the listener from the parent would remove all listeners according to the documentation which states:

You can remove a single listener by passing it as a parameter to off(). Calling off() on the location with no arguments removes all listeners at that location.

For more information, you can refer to this link: https://firebase.google.com/docs/database/web/read-and-write#detach_listeners

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