How to add data to firebase using for loop javascript

Question

I am wondering whether its possible to add data to firebase using a for loop because that data I am working with is more or less the same but the number increments by 1. Currently what I am doing is;

var usersRef = ref.child("users");
usersRef.set({
  Person1: {
    name: "person1",
    surname: "person1"
  },
  Person2: {
    name: "person2",
    surname: "person2"
  },
  Person3: {
    name: "person3",
    surname: "person3"
  },
  .........
  .........
  Person28: {
    name: "person28",
    surname: "person28"
  }
});

What I would instead want to do is:

    var ref = new Firebase("https://docs-examples.firebaseio.com/web/saving-data/fireblog");
    var usersRef = ref.child("users");
 for (var i = 0; i <= 28; ++i) {
    usersRef.set({
    Person+i: {
    name: "person" + i,
    surname: "person" + i
    }
   });
}

Is it possible to something like this? any help is welcomed.

Ilya · Accepted Answer · 2016-02-26 09:06:12Z

2

Sure:

var person = {};

for (var i = 1; i <= 28; ++i) {
    person[ "Person" + i ] = { "name": "person" + i, surname: "person" + i };
}

var ref = new Firebase("https://docs-examples.firebaseio.com/web/saving-data/fireblog");
var usersRef = ref.child("users");
usersRef.set( person );

NB: index should start at 1

edited Feb 26, 2016 at 9:06

answered Feb 26, 2016 at 8:46

Ilya

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6 Comments

Henry Over a year ago

Thanks @llya I will try this now and let you know how I get along, quick question does 'var usersRef = ref.child("users");' have to be inside or outisde for loop?

Ilya Over a year ago

@Henry sorry, I didn't pay attention to the way the object was constructed (only to the prop. set the syntax), I've fixed the code.

Henry Over a year ago

Hi, this only seem to take the last number of the loop (28) and therefore overwriting previous data.

Ilya Over a year ago

It should work, but there's a typo ("name": "person" + 1 instead of "name": "person" + i)

Ilya Over a year ago

@Henry I've fixed the typo and tested, it's working for me.

|

user2687646 · Accepted Answer · 2016-02-26 08:55:55Z

0

I don't see why not but I don't recommend newing up Firebase on each iteration unless the docs explicitly specify to do so. And the same goes for the child getter. I would move them to outside the loop like so:

var ref = new Firebase("https://docs-examples.firebaseio.com/web/saving-data/fireblog");
var usersRef = ref.child("users");
for (var i = 0; i <= 28; ++i) {
    var persons = {};
    persons['Person'+i] = {
        name: "person" + i,
        surname: "person" + i
    }
}
usersRef.set(persons);

The bracket notation can be used for getting/setting properties programmatically as well as using keys that are invalid JavaScript.

edited Feb 26, 2016 at 8:55

answered Feb 26, 2016 at 8:43

user2687646

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4 Comments

Henry Over a year ago

but how can I increment each record by 1 using the loop, when I use 'Person+i' it does not work.

user2687646 Over a year ago

Sorry, missed the point of the question entirely. See the update.

Henry Over a year ago

Hi, this only seem to take the last number of the loop (28) and therefore overwriting previous data.

Frank van Puffelen Over a year ago

@user2687646 you should declare var persons = {} outside of the for loop.

Frank van Puffelen · Accepted Answer · 2016-02-26 09:51:33Z

0

In your current approach (even if you fix the syntax errors), each new user that you add replaces the previous user(s), since you're calling usersRef.set(). If you use update() instead of set, it will not overwrite the existing data.

But this seems simpler to me:

var ref = new Firebase("https://yours.firebaseio.com/");
var usersRef = ref.child("users");
for (var i = 0; i <= 28; ++i) {
    usersRef.child("Person"+i).set({
        name: "person" + i,
        surname: "person" + i
    });
}

answered Feb 26, 2016 at 9:51

Frank van Puffelen

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