Troubleshooting: The issue of Vue JS not successfully navigating between web

After countless attempts, I am still struggling to get my Firebase login function to appropriately switch the component upon signing in. I urgently need assistance with configuring my router to seamlessly transition to the next page once the sign-in process is complete.

<template>
  <div class="vue-tempalte" id="regForm">
    <form>
      <h1 id="middle">Sign In</h1>

      <div class="form-group">
        <label>Email address</label>
        <input type="email" id="email" v-model="email" required />
      </div>

      <div class="form-group">
        <label>Password</label>
        <input type="password" id="password" v-model="password" required />
      </div>

      <button type="submit" @click="login" class="button is-light" id="btn1">
        Sign In
      </button>
    </form>
  </div>
</template>

<style scoped>
</style>

<script>
import firebase from "firebase";
export default {
  name: "login",
  data() {
    return {
      email: "",
      password: "",
    };
  },
  mounted: function () {
    if (firebase.auth().currentUser) this.$router.replace("/HeaderLoggedIn");
  },
  methods: {
    login: function () {
      firebase
        .auth()
        .signInWithEmailAndPassword(this.email, this.password)
        .then((user) => {
          console.log(user.user);
        });
    },
  },
};
</script>

Answer №1

The issue lies within this piece of code:

  mounted: function () {
    if (firebase.auth().currentUser) this.$router.replace("/HeaderLoggedIn");
  },

Currently, the user's authentication status is only checked once when the component is mounted. However, user authentication is an asynchronous process that can occur multiple times.

Instead of checking for authentication on mount, it is recommended to *listen for authentication state changes. This can be achieved by following the example provided in the documentation on determining the signed in user:

  mounted: function () {
    firebase.auth().onAuthStateChanged(function(user) {
      if (user) {
        this.$router.replace("/HeaderLoggedIn");
      }
    });
  },

Answer №2

One alternative approach is to establish a global router.beforeEach function in your main.js file. This allows you to verify the authentication status before accessing any page, consolidating this check into a centralized location rather than repeating it for each individual page. By centralizing this logic, you can implement appropriate actions based on the authentication state.

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