Firebase设置后台消息处理程序

本文介绍了Firebase设置后台消息处理程序的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我一直在尝试在前端自定义通知消息，即，如果未设置发送通知字段，我将尝试添加它.

I have been trying to customise notification message in front end, i.e if a field is not set send in notification, I am trying to add it.

importScripts('www.gstatic/firebasejs/5.0.4/firebase-app.js'); importScripts('www.gstatic/firebasejs/5.0.4/firebase-messaging.js'); var config = { apiKey: "x", authDomain: "y", databaseURL: "z", projectId: "a", storageBucket: "b", messagingSenderId: "1" }; firebase.initializeApp(config); const messaging = firebase.messaging(); console.log('came here'); console.log(messaging.bgMessageHandler); console.log(messaging.setBackgroundMessageHandler,'dsafdsadasfd') messaging.setBackgroundMessageHandler(function(payload) { console.log('[firebase-messaging-sw.js] Received background message ', payload); // Customize notification here var notificationTitle = 'Background Message Title'; var notificationOptions = { body: 'Background Message body.', icon: '/firebase-logo.png' }; console.log(notificationOptions) return self.registration.showNotification(notificationTitle, notificationOptions); }); console.log(messaging.bgMessageHandler);

在执行上面的代码时，即使收到通知，我也没有获得[firebase-messaging-sw.js] Received background message ', payload的控制台.

while executing the above code, I am not getting an console of [firebase-messaging-sw.js] Received background message ', payload, even though i am getting notification.

为什么setBackgroundMessageHandler不起作用?

推荐答案

在应用程序在后台运行时，您发出了发送消息的json请求中的问题.

It looks like problem within the json request that you made to send the message while app is running in background.

注意:如果您在HTTP或XMPP发送请求中设置了通知字段，则这些值将优先于服务工作者中指定的任何值.

firebase.google/docs/cloud- messages/js/topic-messaging

因此，以下格式不会调用后台处理程序:

So,Following format won't call the background handler :

{ to: "e-DLMv........._DiL", notification: { body: "Backgound-Message" } }

在数据内部发送带有通知的消息(它将起作用):

Send message with notification inside data (It will work) :

{ to: "e-DLMv........._DiL", data: { notification: { body: "Backgound-Message" } } }