如何在Firebase中观看添加子事件 [英] how to watch for sub-child added event in firebase

问题描述

是否可以通过firebase观看grandchild_add事件?

is there a way to watch for grandchild_added event with firebase?

我已经使用node.js javascript库为child_added设置了一个观察器，但是当添加一个孩子的孩子时，它不会触发.

I've set up a observer for child_added using the node.js javascript library but it won't trigger for when a child of a child is added.

我正在设置成员的状态信息，并想知道用户何时进入房间.

I'm setting member presence info and would like to know when users enter a room.

即

成员/房间/uname

members/room/uname

推荐答案

收听child_changed.添加孙代算作换一个子代.

Listen for child_changed. Adding a grandchild counts as changing a child.

不幸的是，这可能不尽如人意，但这是唯一对我有用的方法. (也许侦听价值"也是可行的，但这甚至没有那么细致.)

This might not be as granular as you like, unfortunately, but this was the only thing that worked for me. (Probably listening for 'value' works too, but this is even less granular.)

这篇关于如何在Firebase中观看添加子事件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！