Question

我有一个带有聚合物火力的PSK（聚合物入门套件）PWA构建，我想从Firebase Auth呼叫fetchSignInMethodsForEmail()。我尝试过以下但有错误。

firebase.auth().fetchSignInMethodsForEmail(email).then((methods) => {
  // Do something
});

错误Uncaught TypeError: firebase.auth(...).fetchSignInMethodsForEmail is not a function。

我也试过以下但没有运气，即

firebase.auth.fetchSignInMethodsForEmail(email);
firebase.$.auth.fetchSignInMethodsForEmail(email); // Assume firebase-auth with id of 'auth'

Answer 1

Firebase JavaScript SDK v4.12中引入了

fetchProvidersForEmail()，因此您需要至少拥有v4.12及更高版本。

据说它在v5.0中被弃用，而不是fetchSignInMethodsForEmail()。

Answer 2

首先，您必须声明Auth对象m

FirebaseAuth f = FirebaseAuth.getInstance（）;

然后调用fetchSignInMethodsForEmail（）方法。

如下：-

// [START auth_differentiate_link]

auth.fetchSignInMethodsForEmail(email)
.addOnCompleteListener(new OnCompleteListener<SignInMethodQueryResult>() {
    @Override
            public void onComplete(@NonNull Task<SignInMethodQueryResult> task) {
               if (task.isSuccessful()) {
                  SignInMethodQueryResult result = task.getResult();
                  List<String> signInMethods = result.getSignInMethods();
           if(signInMethods.contains(EmailAuthProvider.EMAIL_PASSWORD_SIGN_IN_METHOD)) 
                {
                   // User can sign in with email/password
                } else if (signInMethods.contains(EmailAuthProvider.EMAIL_LINK_SIGN_IN_METHOD)) {
                  // User can sign in with email/link
                }
               } else {
                  Log.e(TAG, "Error getting sign in methods for user", task.getException());
               }
           }
        });
  // [END auth_differentiate_link]
}

如何从Firebase Auth

2 个答案: