Develop Reference

Why is firebase creating a random identifier between parent and child?

I'm playing around with a firebase web app and having some difficulty diagnosing where something is coming from.
I am trying to simply push some data to my project under the heading of the uid created when authentication takes place. The authentication works fine and it is returning the uid correctly however, when values are passed it seems to be adding a second layer before the actual values.
function registerAccount() {
var firebase = app_firebase;
var firebaseRef = app_firebase.database(); //database reference
var user = firebase.auth().currentUser;
uid = user.uid;
var ref = firebaseRef.ref('User').child(uid); //referencing node
var userName = document.getElementById("txtUsernameInput").value;
if (user) {
// User is signed in.
var data = { //data being added
Username: userName,
}
window.location = 'myHome.aspx';
} else {
// No user is signed in.
console.log("Cannot get UID");
}
ref.push(data);
}
I am expecting the data entry to show with the child of user to be the uid taken from the authentication (this is working) then have the passed values immediately in the uid without the seemingly auto generated child between the uid and the values.
Image shows the unwanted field being generated
[See here][1]

André Kool's suggestion in a comment:
Change ref.push(data); to ref.set(data);
worked.

Firebase - Check if logged in user id equals realtime database value

currently I'm working on a new Firebase web project.
I want to check if the current logged in user ID is saved in the realtime database to give the user some specific possibilities / rights on my site.
Realtime Database:
users
>*User ID* (the value to compare)
My question: Which JavaScript code can compare the currently logged in Firebase user with this db value?

I'm sure by now you have found that all your questions have been answered on the firebase documentation.
On your web app, the currently signed in user can be gotten using
firebase.auth().currentUser;
To compare the logged in user with child key do this
var user_id = firebase.auth().currentUser.uid;
firebase.database().ref('users/'+user_id).once('value').then(userSnapshot => {
if(userSnapshot.exists()){
//allow user perform action
}else{
// do not allow
}
}).catch(error => {
console.error(error);
});

How can i store the registration details in local storage without overwriting it the next time?

So basically i have a registration form and everytime the user registers, i store their data in HTML local storage, but i want the data to look like this for example:
user| [{"username":"Maximillian","password":"whatever","address":""whatever".... and so on. So far i have this code but i am confused with why it doesn't work the way i want it to. And how do i make sure that when another person registers, their details does not overwrite the current register details already on local storage?

You could store an array of the users. For example:
var users = JSON.parse(localStorage.getItem('Users')) || [];
var userData = [{Username:document.getElementById("UserName").value},
{Email:document.getElementById("EmailAddress").value},
{Password:document.getElementById("PassWord").value},
{Address:document.getElementById("Address1").value},
{Phone:document.getElementById("PhoneNumber").value}];
users.push(userData);
localStorage.setItem('Users', JSON.stringify(users));
Then access the users as such:
var users = JSON.parse(localStorage.getItem('Users')) || [];
users.forEach(console.log);
users[0];
users[1];
[etc.]

How to insert a lead through forcetk in salesforce

js to get data from salesforce .The following function fetches data of a current logged In user from salesforce .
function init() {
// Get an instance of the REST API client and set the session ID
var client = new forcetk.Client();
client.setSessionToken(getValueFromCookie("sid"));
// Retrieve the data representing the current user
client.currentUser(function(response){
var user = response;
console.log(user);
// Find cases that belong to the current user
client.query("SELECT Name FROM User", function(response){
console.log(response);
Tinycon.setBubble(response.totalSize);
});
});
}
Now i want to insert a lead in salesforce through forcetk in current user which is logged In.

AngularFire simple login

I have a FireBase db with a users store. I also use simple login email/pw. In the User store I save some extra info of a user - e.g. the lastlogin date. This is my workflow - from registering to logging in:
I register a user;
when registered it is added to the simple login email/pw sote;
I also add the registered user (includng the id returned from the simplelogin) in the users store. It is stored under a Firebase generated unique key.
I log in as that new user
When successful I get a user object from the simplelogin store:
email-"testuser1#test.com"
firebaseAuthToken-"eyJ0eXAiOiJKV1QiLCJhbGci...SoXkddR3A88vAkENCy5ilIk"
id-"46"
isTemporaryPassword-false
md5_hash-"6a4b6cb2045fd55f706eaebd6ab5d4f7"
provider-"password"
uid-"simplelogin:46"
Now I want to update the corresponding user in the User store - e.g. set the lastlogin key to now. But I only can update that user when I know the Firebase generated key it's under. How can I access that key?
The only other way to identify the user in the Users store is by retrieving all users in the Users store, looping through all of them and checking : does the current id key value match the id key value of the logged-in user. Looks a bit clumsy to me but I fear this is the only way I can do lookups with firebase?

When you save a registered user you should save them by their uid rather than a generated id. This way when the user logs back in we'll user the uid to get the user from the users node.
var fbRef = new Firebase('https://<YOUR-FIREBASE>.firebaseio.com');
var auth = new FirebaseSimpleLogin(fbRef, function(error, user) {
if (error) {
console.error(error);
} else if (user) {
// when a user logs in we can update their lastLogin here
// set the key to the uid for the user
// this would look like: https://myapp.firebaseio.com/users/1
fbRef.child('users').child(user.uid).update({
lastLogin: Firebase.ServerValue.TIMESTAMP // the time they logged in
});
}
});
// here when we create a user we will set the key to the uid under the users node
auth.createUser(email, password, function(error, user) {
// if there is no error
if (!error) {
// go to the users node, then set a location at the user's uid
// this would look like: https://myapp.firebaseio.com/users/1
fbRef.child('users').child(user.uid).set(user);
}
});
As the users are created our users node will look like this: