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onMessage() not fired when app is in background (Web javascript).

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评估

难度
3/5
预计耗时
1-2 天
新手友好度
25/100
Issue 类型
缺陷
描述清晰度
需要澄清
活跃度
停滞
技术栈
firebase, javascript
领域
frontend, web-dev

调研方向

首先，将 Firebase Web Messaging 关于 onMessage()、onBackgroundMessage() 和通知点击的文档与提供的 index 代码和 sw.js 片段进行比较。使用 Firebase SDK 8.9.1 重现后台窗口流程，然后验证文档所述的 callback 行为是否符合报告中的预期，并确定支持哪种澄清或 repository 更改。

由索引模型根据 Issue 内容生成。

描述

I building a simple demo chat app with fcm integrated for new message notification. As far as I know, in fcm doc regarding onMessage(), it said this method get called when:
(1) a message is received while the app has focus
(2) - the user clicks on an app notification created by a service worker messaging.onBackgroundMessage handler.

But I'm not sure why onMessage() callback is not fired when my app is in background.

Step 1: Describe your environment
  • Operating system: OSX Big Sur
  • Browser: All
  • Firebase SDK version: 8.9.1
Step 2: Describe the problem:

onMessage() callback is not fired when my app is in background.

Steps to reproduce:
  1. hide current browser window to make it in background state.
  2. send test message.
Observed Results:

onBackgroundMessage() from sw.js get called fine, but when I clicked on the notification to land on my app window, onMessage() did not get triggered (it's only triggered when the current browser window is in foreground state). It did not show any error or warning.

Expected Results:

onMessage() should be fired after I clicked the notification to have my app focused.

Relevant Code:

this is my index file

const messaging = firebase.messaging();

    function sendTokenToServer(fcm_token) {
        let player_sn = '{{Auth::id()}}';
        axios.post('api/save-token', {
                fcm_token,
                player_sn
            })
            .then(function(response) {
                // console.log(response);
            })
            .catch(function(error) {
                console.log(error);
            });
    }

    messaging.getToken({
        vapidKey: '{{config("fcm.VAPID")}}'
    }).then((currentToken) => {
        // console.log(currentToken)
        if (currentToken) {
            sendTokenToServer(currentToken)
        } else {
            // Show permission request UI
            console.log('No registration token available. Request permission to generate one.');
            // ...
        }
    }).catch((err) => {
        console.log('An error occurred while retrieving token. ', err);
        // ...
    });

    messaging.onMessage((payload) => {
        console.log('onMessage');
        console.log(payload)
    });

this is my sw.js

importScripts('https://cdnjs.cloudflare.com/ajax/libs/firebase/8.10.1/firebase.js');
importScripts('https://cdnjs.cloudflare.com/ajax/libs/firebase/8.10.1/firebase-messaging.min.js');

const firebaseConfig = {

    apiKey: "AIzaSyBE90OnfKk6MELQ2-Z_DVLYp4maXVzvQO8",

    authDomain: "ninja-firestore-tut-nov11.firebaseapp.com",

    databaseURL: "https://ninja-firestore-tut-nov11-default-rtdb.asia-southeast1.firebasedatabase.app",

    projectId: "ninja-firestore-tut-nov11",

    storageBucket: "ninja-firestore-tut-nov11.appspot.com",

    messagingSenderId: "28680409583",

    appId: "1:28680409583:web:66bef6c94232b88816e61a"

};
firebase.initializeApp(firebaseConfig);
const messaging = firebase.messaging();
messaging.onBackgroundMessage((payload) => {
    console.log('onBackgroundMessage ', payload);
    // Customize notification here
     const {title, body} = payload.notification;
     const notificationTitle = title;
     const notificationOptions = {
         body: body,
         icon: '/firebase-logo.png'
     };
    // self.registration.showNotification(notificationTitle,
    //     notificationOptions);



});

Note: I need to comment self.registration.showNotification(notificationTitle, notificationOptions); to avoid the notification got duplicate.

Any help on this would be much appreciated...
Thank you.

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