Question 249372 in Javascript Question posted in
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Javascript – How to access variable outside of function scope

I am receiving data in my public folder file, which is firebase-messaging-sw.js from source code e.g main thread with postMessage method. I want to use that data received into messaging.onBackgroundMessage function. Here is my code:

self.addEventListener("message", event => {
  const messageData = event.data
  console.log(messageData)
})
messaging.onBackgroundMessage((payload) => {
  // const notification = new Notification(messageData[keywords][lang]![title], {
  //   body: messageData[keywords][lang]![body]
  // });
  storeMessage(payload.data);
});

I want to use that messageData into messaging.onBackgroundMessage function. I have tried declaring let messageData outside of function scopes but it doesn’t work.

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2

Answers


  1. 0

    you can return the value of variable.

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  2. 0

    In the code snippet below, messageData is available in messaging.bar

    So either your messageData variable isn’t accessible, or the second event handler (onBackgroundMessage) is occurring before the first (message event)

    let self = {}, messaging = {}, messageData;

self.foo = (event => {
  messageData = event.data
  console.log(messageData)
})
messaging.bar = ((payload) => {
  // const notification = new Notification(messageData[keywords][lang]![title], {
  //   body: messageData[keywords][lang]![body]
  // });
//  storeMessage(payload.data);
  console.log(messageData);
});

var event = {};
event.data = "test";
self.foo(event);
messaging.bar();
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