如何删除/移除 Firebase 上的节点 [英] How to delete/remove nodes on Firebase

问题描述

我将 Firebase 用于网络应用.它是用纯 Javascript 编写的，没有使用外部库.

I'm using Firebase for a web app. It's written in plain Javascript using no external libraries.

我可以使用 '.on("child_ added")' 来推送"和检索数据，但是 '.remove()' 并不能像它所说的那样工作.根据 API，

I can "push" and retrieve data with '.on("child_added")', but '.remove()' does not work the way it says it should. According to the API,

"Firebase.remove() -删除此 Firebase 位置的数据.子位置的任何数据也将被删除.删除的效果立马可见."

"Firebase.remove() - Remove the data at this Firebase location. Any data at child locations will also be deleted. The effect of the delete will be visible immediately."

然而，移除不会立即发生；只有当整个脚本完成运行时.我需要立即删除并使用清除的树.

However, the remove is not occurring immediately; only when the entire script is done running. I need to remove and then use the cleared tree immediately after.

示例代码:

ref = new Firebase("myfirebase.com") //works
ref.push({key:val}) //works

ref.on('child_added', function(snapshot){
//do stuff
}); //works

ref.remove()
//does not remove until the entire script/page is done

这里有一个类似的帖子，但我是不使用 Ember 库，即便如此，它似乎是一种解决方法，它应该像 API 解释的那样简单.

There is a similar post here but I am not using Ember libraries, and even so it seems like a workaround for what should be as simple as the API explains it to be.

推荐答案

问题是你在 Firebase 的根上调用了 remove:

The problem is that you call remove on the root of your Firebase:

ref = new Firebase("myfirebase.com")
ref.remove();

这将通过 API 删除整个 Firebase.

This will remove the entire Firebase through the API.

您通常希望删除它下面的特定子节点，您可以这样做:

You'll typically want to remove specific child nodes under it though, which you do with:

ref.child(key).remove();

这篇关于如何删除/移除 Firebase 上的节点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！