在 firebase (javascript) 中，如何获取当前登录用户的数据？

Question

I've spent a few days researching for the solution. I have found many answers that were quite helpful, but still I haven't been able to find a solution that fully resolved my problem. Basically all I want to do is to get current user's data (stored in firebase realtime database) and display them on the user's screen.

So far, I can display data for all the user. But how can I have it display data for only the current user ? (How can I get the push key of only the current user ?)

• I'm not an experienced programmer (less than a year). Please use a language that is easy to understand.
• I've gone through all the firebase documentation. Please don't just give me the copy of the documentation or the link to it.

Screenshot: Firebase realtime database

Screenshot: JavaScript function for retrieving current user's data

Additional JavaScript screenshot

Answer 1

User data is wherever you choose to store it--other than name , email , and a few other fields, the User object cannot actually store any other info. Therefore, you will need to decide where in the database you want to keep your extra data.

Assuming you choose to create a collection users with children named by uid , and you store the users' countries in those documents, the following will get you a specific user's data and you can use whatever fields you'd like from there:

let ref = database.ref('/users/' + currentUser.uid).once('value').then(function(snapshot) {
    let userData = snapshot.val();
    console.log(userData.country);
}

Answer 2

Here you go!

function showUser(){
   var usref=firebase.database().ref("countries/"+uid);
   //uid here is the unique code u gave to the specif user
   usref.once('value', function(snapshot) {snapshot.forEach(function(childSnapshot) {
   if((childSnapshot.key)=="country"){
     var country = childSnapshot.val();
     //use this variable here enter code here
     window.alert(country);//just for checking!!!
   }
   if((childSnapshot.key)=="age"){
     var name = childSnapshot.val();
     //use this variable here
     window.alert(name);//just for checking!!!
   }
   });
 });
}

I hope this code works for you.