Question

使用firestore数据库创建应用程序。我有一个问题，我想在其他功能中访问用户ID，我该怎么办？

我正在使用firebase.auth（）。onAuthStateChanged函数观察用户是否已登录，我可以在此处访问用户ID。

点击btnName后如何访问它？现在我必须遵循错误：

未捕获的ReferenceError：未定义uid

HTML

<html lang="en">
<head>
  <meta charset="utf-8">

  <title></title>

  <meta name="description" content="">
  <meta name="viewport" content="user-scalable=no, initial-scale=1.0, width=device-width, maximum-scale=1.0" />

  <script src="https://www.gstatic.com/firebasejs/4.9.0/firebase.js"></script>
  <script src="https://www.gstatic.com/firebasejs/4.9.0/firebase-firestore.js"></script>

</head>

<body>

    <h1>Welcome</h1>
    <button id="btnLogout" class="hide">Logout</button>
    <br><br>
    <input id="txtName" type="" placeholder="Name">
    <button id="btnName">Add name</button>

    <script src="js/app.js"></script>

</body>
</html>

JS

// Initialize Firebase
var config = {
  apiKey: "AIzaSyBAQYQxSU0JkskvXKqBKzAHHWViutuP_lg",
  authDomain: "crypto-3171a.firebaseapp.com",
  databaseURL: "https://crypto-3171a.firebaseio.com",
  projectId: "crypto-3171a",
  storageBucket: "crypto-3171a.appspot.com",
  messagingSenderId: "86923986632"
};
firebase.initializeApp(config);

const db = firebase.firestore();

const txtName = document.getElementById('txtName');
const btnName = document.getElementById('btnName');

// log user out of app
btnLogout.addEventListener('click', e => {
    firebase.auth().signOut();
});

firebase.auth().onAuthStateChanged(function(user) {
  if (user) {
      addToUsers(user)
  } else {
  }
});

// add users to database 'users'
function addToUsers(user) {
    var email = user.email;
    var uid = user.uid;
    var users = db.collection("users").doc(uid);
    users.set({
        email: email,
        id: uid
    });
}

// when user clicks add name to 'users' document
btnName.addEventListener('click', e => {
    console.log(db.collection("users").doc(uid))
});

Answer 1

您可以使用firebase.auth().currentUser获取当前登录用户，结帐此代码

btnName.addEventListener('click', e => {
    let user = firebase.auth().currentUser;    
    console.log(user);
    if(user)
        console.log(db.collection("users").doc(uuser.uid))
    else
        alert('user not logged in')
});

Firestore可以访问其他功能中的用户ID

1 个答案: