Utilizing Firebase messaging onMessage function is exclusively enabled within a window environment

Question

Utilizing Firebase messaging onMessage function is exclusively enabled within a window environment

Incorporating Firebase Cloud Messaging into my project allowed me to send and receive push notifications successfully. While I can receive the push notifications, unfortunately, I am encountering issues with getting the notification events to function properly. Specifically, I am aiming to have the onMessage event operational; however, I keep receiving an error message:

Messaging: This method is available in a Window context. (messaging/only-available-in-window).

This section showcases my service-worker code related to messaging:

// Granting the service worker access to Firebase Messaging.
// Only Firebase Messaging is accessible here as other Firebase libraries are not supported.
importScripts('https://www.gstatic.com/firebasejs/6.3.4/firebase-app.js')
importScripts('https://www.gstatic.com/firebasejs/6.3.4/firebase-messaging.js')

// Initializing the Firebase app in the service worker by providing the
// messagingSenderId value.
firebase.initializeApp({
  messagingSenderId: 'XXXXXXXX'
})

// Obtaining an instance of Firebase Messaging to manage background
// messages.
const messaging = firebase.messaging()
// messaging.setBackgroundMessageHandler(payload => {
//   console.log(payload)
// })
messaging.onMessage(function(payload) {
  // Messages received, either due to the
  // application being active or
  // because the notification was interacted with.
  // `payload` will include your data.
  console.log('Message received. ', payload)
})

I also attempted embedding the function within my Vue component, but the issue persists. Can someone please help me identify what may be causing this problem?

javascript firebase vue.js vuejs2 firebase-cloud-messaging

Answer 1

Answer №1

It is important to note that the onMessage callback should not be implemented within a service worker. Instead, in a service worker, you should utilize the following code snippet (refer to the Firebase documentation):

messaging.setBackgroundMessageHandler(function(payload) {
  console.log('[firebase-messaging-sw.js] Received background message ', payload);
  // ...
});

I have personally verified that this method works effectively. Keep in mind that this will only activate when your app is running in the background, and if you are sending data messages. In the case of sending notifications, the SDK will handle the message display automatically without triggering your setBackgroundMessageHandler callback. Even when incorporating both data and notification content in the payload, the SDK will take over the process.

If you wish to respond to messages outside of a service worker, ensure that the tab displaying your website is active in the foreground. At that point, the following code segment will function as expected (same as your initial setup):

messaging.onMessage((payload) => {
  console.log('Message received. ', payload);
  // ...
});

In my Vue component (with Vue 3), I have applied the above code snippet with no errors occurring, although the callback does not execute. It may work differently for you. This callback should trigger regardless of the message type—be it data, notification, or a combination of both.

Additionally, make sure to refer to the table provided in the linked documentation to understand which callback will be activated under specific circumstances.

Edit: An essential note is that the onMessage callback will not be initialized if there is a version mismatch between the Firebase JS SDK installed via npm/Yarn and the one being imported by the service worker. For example, encountering versions 7.2.3 and 6.3.4 caused issues in my case. After aligning the service worker with version 7.2.3, the onMessage callback started executing while the app was in focus. Acknowledgment goes to ErAz7 for shedding light on this matter. Source!

Answer 2

It is important to note that the onMessage callback should not be implemented within a service worker. Instead, in a service worker, you should utilize the following code snippet (refer to the Firebase documentation):

messaging.setBackgroundMessageHandler(function(payload) {
  console.log('[firebase-messaging-sw.js] Received background message ', payload);
  // ...
});

I have personally verified that this method works effectively. Keep in mind that this will only activate when your app is running in the background, and if you are sending data messages. In the case of sending notifications, the SDK will handle the message display automatically without triggering your setBackgroundMessageHandler callback. Even when incorporating both data and notification content in the payload, the SDK will take over the process.

If you wish to respond to messages outside of a service worker, ensure that the tab displaying your website is active in the foreground. At that point, the following code segment will function as expected (same as your initial setup):

messaging.onMessage((payload) => {
  console.log('Message received. ', payload);
  // ...
});

In my Vue component (with Vue 3), I have applied the above code snippet with no errors occurring, although the callback does not execute. It may work differently for you. This callback should trigger regardless of the message type—be it data, notification, or a combination of both.

Additionally, make sure to refer to the table provided in the linked documentation to understand which callback will be activated under specific circumstances.

Edit: An essential note is that the onMessage callback will not be initialized if there is a version mismatch between the Firebase JS SDK installed via npm/Yarn and the one being imported by the service worker. For example, encountering versions 7.2.3 and 6.3.4 caused issues in my case. After aligning the service worker with version 7.2.3, the onMessage callback started executing while the app was in focus. Acknowledgment goes to ErAz7 for shedding light on this matter. Source!

Utilizing Firebase messaging onMessage function is exclusively enabled within a window environment

Answer №1

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