我正在将Firebase用于Web应用程序。目标是允许熟悉的登录/注册用户注册或登录一页，并在成功验证后进入主页。
流程看起来像这样： 登录/注册 - ＆gt; （允许访问） - ＆gt; [主页，简介，搜索，朋友等]
我正在使用Javascript（没有AngularJs，因为我完全不熟悉它）。我遇到的问题是，一旦用户成功登录或注册，他们的“用户对象”在使用时将变为空
window.location = 'home.html'
这是完整的代码。我现在使用找到Firebase的示例进行身份验证过程，但home.html正在执行：
<!DOCTYPE html>
<html>
<head>
<!--Bootstrap CSS CDN-->
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<!---jQuery CDN-->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script type="text/javascript">
/**
* Handles the sign in button press.
*/
function toggleSignIn() {
if (firebase.auth().currentUser) {
// [START signout]
firebase.auth().signOut();
// [END signout]
} else {
var email = document.getElementById('email').value;
var password = document.getElementById('password').value;
if (email.length < 4) {
alert('Please enter an email address.');
return;
}
if (password.length < 4) {
alert('Please enter a password.');
return;
}
// Sign in with email and pass.
// [START authwithemail]
firebase.auth().signInWithEmailAndPassword(email, password).catch(function(error) {
// Handle Errors here.
var errorCode = error.code;
var errorMessage = error.message;
// [START_EXCLUDE]
if (errorCode === 'auth/wrong-password') {
alert('Wrong password.');
} else {
alert(errorMessage);
}
console.log(error);
document.getElementById('quickstart-sign-in').disabled = false;
// [END_EXCLUDE]
});
// [END authwithemail]
window.location = '/1home.php'
}
document.getElementById('quickstart-sign-in').disabled = true;
}
/**
* Handles the sign up button press.
*/
function handleSignUp() {
var email = document.getElementById('email').value;
var password = document.getElementById('password').value;
if (email.length < 4) {
alert('Please enter an email address.');
return;
}
if (password.length < 4) {
alert('Please enter a password.');
return;
}
// Sign in with email and pass.
// [START createwithemail]
firebase.auth().createUserWithEmailAndPassword(email, password).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]
});
// [END createwithemail]
}
/**
* Sends an email verification to the user.
*/
function sendEmailVerification() {
// [START sendemailverification]
firebase.auth().currentUser.sendEmailVerification().then(function() {
// Email Verification sent!
// [START_EXCLUDE]
alert('Email Verification Sent!');
// [END_EXCLUDE]
});
// [END sendemailverification]
}
function sendPasswordReset() {
var email = document.getElementById('email').value;
// [START sendpasswordemail]
firebase.auth().sendPasswordResetEmail(email).then(function() {
// Password Reset Email Sent!
// [START_EXCLUDE]
alert('Password Reset Email Sent!');
// [END_EXCLUDE]
}).catch(function(error) {
// Handle Errors here.
var errorCode = error.code;
var errorMessage = error.message;
// [START_EXCLUDE]
if (errorCode == 'auth/invalid-email') {
alert(errorMessage);
} else if (errorCode == 'auth/user-not-found') {
alert(errorMessage);
}
console.log(error);
// [END_EXCLUDE]
});
// [END sendpasswordemail];
}
/**
* Handles registering callbacks for the auth status.
*
* This method registers a listener with firebase.auth().onAuthStateChanged. This listener is called when
* the user is signed in or out, and that is where we update the UI.
*
* When signed in, we also authenticate to the Firebase Realtime Database.
*/
function initApp() {
// Listening for auth state changes.
// [START authstatelistener]
firebase.auth().onAuthStateChanged(function(user) {
// [START_EXCLUDE silent]
document.getElementById('quickstart-verify-email').disabled = true;
// [END_EXCLUDE]
if (user) {
// User is signed in.
var displayName = user.displayName;
var email = user.email;
var emailVerified = user.emailVerified;
var photoURL = user.photoURL;
var isAnonymous = user.isAnonymous;
var uid = user.uid;
var refreshToken = user.refreshToken;
var providerData = user.providerData;
// [START_EXCLUDE silent]
document.getElementById('quickstart-sign-in-status').textContent = 'Signed in';
document.getElementById('quickstart-sign-in').textContent = 'Sign out';
document.getElementById('quickstart-account-details').textContent = JSON.stringify({
displayName: displayName,
email: email,
emailVerified: emailVerified,
photoURL: photoURL,
isAnonymous: isAnonymous,
uid: uid,
refreshToken: refreshToken,
providerData: providerData
}, null, ' ');
if (!emailVerified) {
document.getElementById('quickstart-verify-email').disabled = false;
}
// [END_EXCLUDE]
} else {
// User is signed out.
// [START_EXCLUDE silent]
document.getElementById('quickstart-sign-in-status').textContent = 'Signed out';
document.getElementById('quickstart-sign-in').textContent = 'Sign in';
document.getElementById('quickstart-account-details').textContent = 'null';
// [END_EXCLUDE]
}
// [START_EXCLUDE silent]
document.getElementById('quickstart-sign-in').disabled = false;
// [END_EXCLUDE]
});
// [END authstatelistener]
document.getElementById('quickstart-sign-in').addEventListener('click', toggleSignIn, false);
document.getElementById('quickstart-sign-up').addEventListener('click', handleSignUp, false);
document.getElementById('quickstart-verify-email').addEventListener('click', sendEmailVerification, false);
document.getElementById('quickstart-password-reset').addEventListener('click', sendPasswordReset, false);
}
window.onload = function() {
initApp();
};
</script>
</head>
<body>
<div class="jumbotron text-center">
</div>
<div class="container">
<div class="jumbotron">
<div class="row">
<div class="col-md-6">
<!--<img src="" style="width:500px; height:340px">-->
</div>
<div class="col-md-6">
<!-- Container for the demo -->
<div class="mdl-card mdl-shadow--2dp mdl-cell mdl-cell--12-col mdl-cell--12-col-tablet mdl-cell--12-col-desktop">
<div class="mdl-card__title mdl-color--light-blue-600 mdl-color-text--white">
<h2 class="mdl-card__title-text">Sign Up</h2>
</div>
<div class="mdl-card__supporting-text mdl-color-text--grey-600">
<p>Enter an email and password below and either sign in to an existing account or sign up</p>
<input class="mdl-textfield__input" style="display:inline;width:auto;" type="text" id="email" name="email" placeholder="Email"/>
<br /><br />
<input class="mdl-textfield__input" style="display:inline;width:auto;" type="password" id="password" name="password" placeholder="Password"/>
<br/><br/>
<button disabled class="mdl-button mdl-js-button mdl-button--raised" id="quickstart-sign-in" name="signin">Sign In</button>
<button class="mdl-button mdl-js-button mdl-button--raised" id="quickstart-sign-up" name="signup">Sign Up</button>
<button class="mdl-button mdl-js-button mdl-button--raised" disabled id="quickstart-verify-email" name="verify-email">Send Email Verification</button>
<button class="mdl-button mdl-js-button mdl-button--raised" id="quickstart-password-reset" name="verify-email">Send Password Reset Email</button>
<!-- Container where we'll display the user details -->
<div class="quickstart-user-details-container">
<!--Firebase--> sign-in status: <span id="quickstart-sign-in-status">Unknown</span>
<div><!--Firebase--> auth <code>currentUser</code> object value:</div>
<pre><code id="quickstart-account-details">null</code></pre>
</div>
</div><!---->
</div>
</div>
</div>
</div>
<!--Bootstrap Js CDN-->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
<!--Firebase Initialization-->
<script src="https://www.gstatic.com/firebasejs/3.2.1/firebase.js"></script>
<script>
// Initialize Firebase
var config = {
apiKey: "XXXXXXXXXXXXXXXXX",
authDomain: "XXXXXXXXXXXXXX",
databaseURL: "XXXXXXXXXXXXX",
storageBucket: "XXXXXXXXXXXXXXXX",
};
firebase.initializeApp(config);
</script>
</body>
</html>
此外，auth屏幕重定向到的页面正在使用onAuthStateChanged监视身份验证状态。这是使用console.log(user);返回null的地方，尽管打印使用console.log("Attempted sign in);。我从Firebase Auth示例中复制了initApp函数。也许我在错误的地方使用它？
<!DOCTYPE html>
<html>
<head>
<meta name ="viewport" content ="width=device-width, initial-scale=1.0">
<!--Bootstrap CSS CDN-->
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<!---jQuery CDN-->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<link rel="stylesheet" href="styles.css">
<link rel="stylesheet" href="animations.css">
<!--Firebase-->
<script type="text/javascript">
function initApp() {
// Listening for auth state changes.
// [START authstatelistener]
firebase.auth().onAuthStateChanged(function(user) {
// [START_EXCLUDE silent]
// [END_EXCLUDE]
console.log("Attempted Sign in");
console.log(user);
if (user) {
// User is signed in.
console.log("Attempted Sign in successful");
var displayName = user.displayName;
var email = user.email;
var emailVerified = user.emailVerified;
var photoURL = user.photoURL;
var isAnonymous = user.isAnonymous;
var uid = user.uid;
var refreshToken = user.refreshToken;
var providerData = user.providerData;
console.log(uid);
console.log(displayName);
console.log(email);
console.log(photoURL);
// [START_EXCLUDE silent]
if (!emailVerified) {
}
// [END_EXCLUDE]
} else {
// User is signed out.
// [START_EXCLUDE silent]
// [END_EXCLUDE]
}
// [START_EXCLUDE silent]
// [END_EXCLUDE]
});
// [END authstatelistener]
}
window.onload = function() {
initApp();
// Register the callback to be fired every time auth state changes
ref.onAuth(function(authData) {
if (authData) {
console.log("User " + authData.uid + " is logged in with " + authData.provider);
} else {
console.log("User is logged out");
}
});
};
</script>
因此，重新迭代问题和目标：我希望能够在此页面上对用户进行身份验证（上面的代码代表登录/注册屏幕），然后向他们发送一组加载内容的页面在他们的Firebase ID上。
答案 0 :(得分：7)
我认为您过早地调用了重定向。尝试将其放在onAuthStateChanged回调中。如果您在本地Firebase客户端有时间注册身份验证更改之前重定向，则您的会话将没有时间存储在localStorage中，因此当您到达目的地时，将无法进行任何会话。登录过程实际上是短路的。
尝试类似
的内容firebase.auth().onAuthStateChanged(function(user) {
if (user) {
window.location = '/1home.php';
}
}