javascript - How to add user UID in the place of firestore document ID - Stack Overflow

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i'm trying to get user UID in the place of auto generated document ID in Firebase/Firestore but can't get it because of this error

TypeError: firebase.auth(...).currentUser is null

this is my index.js file:-

// Firestore Cloud Database 
var db = firebase.firestore();
function reg(){
//window.alert("Working..!");
const txtname = document.getElementById('txtuname').value;
const txtEmail = document.getElementById('txtemail').value;
const txtPass = document.getElementById('txtpass').value;
//window.alert(txtname);
 firebase.auth().createUserWithEmailAndPassword(txtEmail, txtPass).catch(function(error) {
        // Handle Errors here.


        var errorCode = error.code;
        var errorMessage = error.message;
        // [START_EXCLUDE]
        if (errorCode == 'auth/weak-password') {
          alert('The password is too weak.');
        } else {
          //alert(errorMessage);
        }
        console.log(error);
        // [END_EXCLUDE]

      });

 // Getting user id
var uid = firebase.auth().currentUser.uid;
//User Data Insertion
if(uid !=null){
 db.collection("users").doc(uid).add({
    UserName: txtname,
    Email: txtEmail,
    Password: txtPass
})
// .then(function(uid) {
//     console.log("Document written with ID: ", uid);
// })
.catch(function(error) {
    console.error("Error adding document: ", error);
});
}

}

i'm trying to get user UID in the place of auto generated document ID in Firebase/Firestore but can't get it because of this error

TypeError: firebase.auth(...).currentUser is null

this is my index.js file:-

// Firestore Cloud Database 
var db = firebase.firestore();
function reg(){
//window.alert("Working..!");
const txtname = document.getElementById('txtuname').value;
const txtEmail = document.getElementById('txtemail').value;
const txtPass = document.getElementById('txtpass').value;
//window.alert(txtname);
 firebase.auth().createUserWithEmailAndPassword(txtEmail, txtPass).catch(function(error) {
        // Handle Errors here.


        var errorCode = error.code;
        var errorMessage = error.message;
        // [START_EXCLUDE]
        if (errorCode == 'auth/weak-password') {
          alert('The password is too weak.');
        } else {
          //alert(errorMessage);
        }
        console.log(error);
        // [END_EXCLUDE]

      });

 // Getting user id
var uid = firebase.auth().currentUser.uid;
//User Data Insertion
if(uid !=null){
 db.collection("users").doc(uid).add({
    UserName: txtname,
    Email: txtEmail,
    Password: txtPass
})
// .then(function(uid) {
//     console.log("Document written with ID: ", uid);
// })
.catch(function(error) {
    console.error("Error adding document: ", error);
});
}

}

• javascript
• firebase
• firebase-authentication
• google-cloud-firestore

Share Improve this question Follow edited Apr 24, 2018 at 10:00 KENdi 7,78122 gold badges1818 silver badges3131 bronze badges asked Apr 24, 2018 at 7:53 JM007JM007 3311 gold badge11 silver badge33 bronze badges 1

• First a little personal tip: proper code indentation makes it easyer to read (for me). Second it looks like you are trying to add some data in firestore when you create a new user. In that case you have to make sure firebase has finished creating the use: take a look at the docs – André Kool Commented Apr 24, 2018 at 8:13

Add a ment  | 

3 Answers 3

Sorted by: Reset to default 6

Since firebase.auth().createUserWithEmailAndPassword(...) is an async function, you have to wait for it to resolve before continuing.

You can try this:

// Firestore Cloud Database 
var db = firebase.firestore();
function reg(){
    //window.alert("Working..!");
    const txtname = document.getElementById('txtuname').value;
    const txtEmail = document.getElementById('txtemail').value;
    const txtPass = document.getElementById('txtpass').value;
    //window.alert(txtname);
    firebase.auth().createUserWithEmailAndPassword(txtEmail,txtPass)
        .then(function (user) {
            // insert any document you want here
        })
        .catch(function(error) {
            // handle error here
        });

}

Before I present you with my answer, BEWARE cloud functions do take unpredictable amount of time to process. So if you need to immediately start using the data stored in the users collection, maybe it's not the right method for you to take.

Using firebase cloud functions..

exports.createUser = functions.auth.user().onCreate((user) => {
  const userMap = {
    uid: user.uid,
    email: user.email,
  };
  return admin.firestore().collection('user').doc(user.uid).set(userMap);
});

You can relate the below example and generate your code

Here "_email","_password","_city","_phone" are variables for

onSaved: (value) => _email = value

taken from TextFormField() function

Code:

String userId = await widget.auth.createUserWithEmailAndPassword(_email, _password);

print('Registered user: $userId');

final new_user = await FirebaseFirestore.instance.collection('users').doc(userId).
      set({"UserUID":'$userId',"Email":_email,"Password":_password,"City":_city,"Phone 
Number":_phone});

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