页面重定向到另一个页面（仪表板）后如何使用Firebase身份验证用户数据？

Question

after sign in with email and password using firebase authentication , the page is redirected to user dashboard , how can i use the user credntials in that dashboard after the page is redirected.

firebase.auth().signInWithEmailAndPassword(this.email, this.password)
                      .then(cred => {
                          console.log(cred.user);

                          window.location='dashboard.html'
                         }).catch(err => {
                        this.feedback=err.message;
                      })

the data is stored in cloud firestore using the given command :-

 firebase.auth().createUserWithEmailAndPassword(this.email, this.password)
                        .then(cred => {
                            return db.collection('students').doc(cred.user.uid).set({
                                name: this.name,
                                email: this.email
                            });


                    }).then(() => {
                        this.feedback='User registered, please login.';
                        window.location='login.html' ;
                    })
                    .catch(err => {

                        this.feedback=err.message;
                        });

i want to use the store details on the index of user uid in the database and display it on the user dashboard

firebase.auth().onAuthStateChanged(user => {
                      if (user) {
                        console.log(user.email);
                        window.location= 'dashboard.html'
                        console.log(user.email);
                        this.name = user.displayName ;
                        this.email =user.email;
                      }

                  })

Answer 1

To get the user on the new page, use an onAuthStateChange listener as shown here :

 firebase.auth().onAuthStateChanged(function(user) { if (user) { // User is signed in. } else { // No user is signed in. } }); 

In the else block, you'd typically redirect back to the login page. Since Firebase Authentication automatically refreshes its short-lived ID tokens, having the above code in the dashboard page also means that the user can safely bookmark this dashboard page's URL and return to it later.