How to delete remove nodes on Firebase

Question

I m using Firebase for a web app  It s written in plain Javascript using no external libraries   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   -    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     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   Example code   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   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

User · Answer

To remove a record    var db   firebase database                        var ref   db ref      var survey db ref path     path        Eg path is company employee                  survey child key  remove               Eg key is employee id

User · Answer

Firebase remove   like probably most Firebase methods is asynchronous  thus you have to listen to events to know when something happened   parent   ref parent   parent on  child removed   function  snapshot           removed     ref remove     According to Firebase docs it should work even if you lose network connection  If you want to know when the change has been actually synchronized with Firebase servers  you can pass a callback function to Firebase remove method   ref remove function  error        if   error               removed

User · Answer

As others have noted the call to  remove   is asynchronous  We should all be aware nothing happens  instantly   even if it is at the speed of light   What you mean by  instantly  is that the next line of code should be able to execute after the call to  remove    With asynchronous operations the next line may be when the data has been removed  it may not - it is totally down to chance and the amount of time that has elapsed    remove   takes one parameter a callback function to help deal with this situation to perform operations after we know that the operation has been completed  with or without an error    push   takes two params  a value and a callback just like  remove     Here is your example code with modifications   ref   new Firebase  myfirebase com    ref push  key val   function error       do stuff after push completed         deletes all data pushed so far ref remove function error       do stuff after removal

User · Answer

In case you are using axios and trying via a service call    URL  https   react-16-demo firebaseio com  Schema Name  todos Key  -Lhu8a0uoSRixdmECYPE  axios delete  https   react-16-demo firebaseio com todos -Lhu8a0uoSRixdmECYPE json    then      can help

User · Answer

The problem is that you call remove on the root of your Firebase   ref   new Firebase  myfirebase com   ref remove      This will remove the entire Firebase through the API    You ll typically want to remove specific child nodes under it though  which you do with   ref child key  remove

User · Answer

I hope this code will help someone - it is from  official Google Firebase documentation   var adaRef   firebase database   ref  users ada    adaRef remove      then function         console log  Remove succeeded            catch function error        console log  Remove failed      error message

[javascript] How to delete/remove nodes on Firebase

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