检测 Firebase 连接是否丢失/恢复 [英] Detect if Firebase connection is lost/regained

问题描述

是否有一种策略可以在当前的 Firebase 产品中使用来检测服务器连接是否丢失和/或重新获得?

Is there a strategy that would work within the current Firebase offering to detect if the server connection is lost and/or regained?

我正在考虑针对移动设备的一些离线突发事件，我想要一种可靠的方法来确定 Firebase 数据层何时可用.

I'm considering some offline contingencies for mobile devices and I would like a reliable means to determine when the Firebase data layer is available.

推荐答案

这是一个普遍要求的功能，我们刚刚发布了一个 API 更新来让您做到这一点！

This is a commonly requested feature, and we just released an API update to let you do this!

var firebaseRef = new Firebase('http://INSTANCE.firebaseio.com');
firebaseRef.child('.info/connected').on('value', function(connectedSnap) {
  if (connectedSnap.val() === true) {
    /* we're connected! */
  } else {
    /* we're disconnected! */
  }
});

完整文档可在 https://firebase.google.com/docs/database/web/offline-capabilities.

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