I tried to return data after update in firebase but it is displaying as undefined

    test().then((res) => {
        alert(res);
      });

    test() {
    var fredNameRef = new Firebase('');

    var onComplete = function(error) {
      if (error) {
        return error;
      } else {
        return "success";
      }
    };
    fredNameRef.update({ first: 'Wilma', last: 'Flintstone' }, onComplete);
    }

I tried to return data after update in firebase but it is displaying as undefined

    test().then((res) => {
        alert(res);
      });

    test() {
    var fredNameRef = new Firebase('https://docs-examples.firebaseio./samplechat/users/fred/name');

    var onComplete = function(error) {
      if (error) {
        return error;
      } else {
        return "success";
      }
    };
    fredNameRef.update({ first: 'Wilma', last: 'Flintstone' }, onComplete);
    }

• javascript
• firebase
• angular

Share Improve this question Follow asked Mar 19, 2016 at 18:46 Akash RaoAkash Rao 92833 gold badges1212 silver badges2525 bronze badges

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1 Answer 1

Sorted by: Reset to default 8

The onComplete callback is used to check for errors during the update, not to receive the data.

The Firebase SDK surfaces update first locally, and then if successful it fires the onComplete callback.

In your case you want to save the data and then listen for the update using the .on() method.

var fredNameRef = new Firebase('https://docs-examples.firebaseio./samplechat/users/fred/name');

fredNameRef.on('value', function(snap) {
  console.log(snap.val());
});

fredNameRef.update({ first: 'Wilma', last: 'Flintstone' });

After the .update() method is executed, it will trigger the .on() method.