CODEWITHSUNDEEP
javascriptfirebasefirebase-realtime-database
Ultra
Ultra

Reputation: 21

How to get values data from child

How to get last 20 records from firebase? I got:

dataset: undefined undefined

My firebase looks like this:

firebase

my code

var rootRefData = db.ref().child("users_db/user1/dataset");
rootRefData.once("value", snap => {
    var key = snap.key;
    var timestamp = snap.val().timestamp;
    var log = snap.val().log;
    var custom = "";

    // create line chart
    custom += key + ": " + timestamp + " " + log + "<br />";
    console.log(custom);

    counter++;
    $("#chartsl-container-all").append(custom);
});

Upvotes: 1

Views: 51

Answers (1)

Peter Haddad
Peter Haddad

Reputation: 80914

Try this:

var rootRefData = db.ref().child("users_db/user1/dataset");
rootRefData.once("value", snap => {
snap.forEach(function (snapshot) {
var key = snapshot.key;
var timestamp = snapshot.val().timestamp;
var log = snapshot.val().log;
var custom = "";

rootRefData is at node dataset, since you want to get timestamp and log, then you need to iterate inside the randomid using forEach to be able to get those values and the random id.

Upvotes: 1

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