Need to monitor a Firebase table for any updates

How can I ensure my Angular 2 app listens to changes in a Firebase table? I am using Angular2, Firebase, and TypeScript, but the listener is not firing when the database table is updated.

I want the listener to always trigger whenever there are updates or changes in the table. It appears that placing the listener in a global location might be necessary as it's currently located in a service file.

This is what I have tried:

this.adminNotifications = new Firebase(_environment.firebaseUrl + "/adminNotifications");

taskSchedulerListener = (): Promise<any> => { 
    this.adminNotifications.on('value', function(snapshot: any) {
        console.log("admin notification hit!");
    });
}

Please let me know if you require additional code samples. At the moment, my goal is for the listener to respond when changes occur in the adminNotifications table. Essentially, I want the console.log method from the snippet above to execute.

No errors appear in the console, but the action does not take place when the adminNotifications table is modified.

Answer №1

After encountering the same issue myself, I discovered that there is no need to encapsulate your listener within a promise before returning it. Simply modify your code as shown below:

this.adminNotifications = new Firebase(_environment.firebaseUrl + "/adminNotifications");

taskSchedulerListner = this.adminNotifications.on('value', function(snapshot: any) {
        console.log("admin notification hit!");
    });

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