未捕获的TypeError：无法使用网站读取null的属性'uid' [英] Uncaught TypeError: Cannot read property 'uid' of null using website
问题描述
我想从firestore获取注册用户详细信息到html页面。当用户点击我的个人资料页面时，它会导航到下一个html页面，其中包含名字和姓氏等字段。这些字段已在注册页面输入。所以我想从firestore获取这些细节到下一个html页面。但我得到的错误如无法读取属性'uid'为null。如何解决这个问题这是我的html页面：
I want to get registered user details from firestore into html page. When user clicks my profile page it navigate to next html page with fields like first name and last name etc.. . This fields are already entered at the time of signup page. so i want get those details from firestore into next html page. But i got the error like "Cannot read property 'uid' of null ". How to resolve that problem this is my html page :
<!doctype html>
<html lang="en">
<head>
<title> deyaPay</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<script src="https://www.gstatic.com/firebasejs/4.6.2/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/4.6.2/firebase-auth.js"></script>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.6/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>
<script src="https://www.gstatic.com/firebasejs/4.6.2/firebase-firestore.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous">
<script>
var config = {
apiKey: "AIzaSyAJsAstiMsrB2QGJyoqiTELw0vsWFVVahw",
authDomain: "websignin-79fec.firebaseapp.com",
databaseURL: "https://websignin-79fec.firebaseio.com",
projectId: "websignin-79fec",
storageBucket: "",
messagingSenderId: "480214472501"
};
firebase.initializeApp(config);
</script>
<script src="https://www.gstatic.com/firebasejs/4.6.2/firebase-firestore.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous">
<style>
// css goes here..
</style>
<script type="text/javascript">
function myProfile() {
var user = firebase.auth().currentUser.uid;
var db = firebase.firestore();
var docRef = db.collection("deyaPayusers").doc(user);
docRef.get().then(function(doc) {
if(doc && doc.exists) {
const myData = doc.data();
const ffname = myData.FirstName;
const llname = myData.LastName;
const phonen = myData.PhoneNumber;
document.getElementById("fname").value = ffname;
document.getElementById("lname").value = llname;
document.getElementById("phone").value = phonen;
}
}).catch(function(error) {
console.log("Got an error: ",error);
});
}
</script>
</head>
<body onload='myProfile()'>
<div class= "login-form">
<form method="post">
<h2>Profile</h2>
<div class="form-group">
<input type="text" name="firstname" id="fnmae" placeholder="FirstName" class="form-control" >
</div>
<div class="form-group">
<input type="text" name="lastname" id="lnmae" placeholder="LastName" class="form-control" >
</div>
<div class="form-group">
<input type="text" name="phone" id="phone" placeholder="PhoneNumber" class="form-control" >
</div>
</form>
</div>
</body>
</html>
推荐答案
您的错误说无法阅读属性'uid'为null 。这意味着你在页面加载时加载 myProfile（）这个函数，到那时 user 可能为null。从firebase获取auth详细信息会有滞后。试试这种方式
Your error says Cannot read property 'uid' of null. which means you are loading myProfile() this function on page load, by that time user may be null. There will be a lag to fetch auth details from firebase. Try this way
firebase.auth().onAuthStateChanged(function(user) {
if (user) {
// User is signed in.
var db = firebase.firestore();
var docRef = db.collection("deyaPayusers").doc(user.uid);
docRef.get().then(function(doc) {
if(doc && doc.exists) {
const myData = doc.data();
const ffname = myData.FirstName;
const llname = myData.LastName;
const phonen = myData.PhoneNumber;
document.getElementById("fname").value = ffname;
document.getElementById("lname").value = llname;
document.getElementById("phone").value = phonen;
}
}).catch(function(error) {
console.log("Got an error: ",error);
});
} else {
// No user is signed in.
}
});
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