javascript - Why firebase database now returns null when used to work great? -


i have firebase web app used read , write firebase database fine. of week same code:

var ref = new firebase ('https://myapp.firebaseio.com/web/data'); ref.child(id + "/slot" + timeslot + "/vote").on("value",function(snapshot){ console.log(snapshot.val()); // returning null sval = (snapshot.val());

now returns null sval.

can please explain 1.why , 2.what should it? thank you.


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