Issue with Vue JS v-if directive not correctly updating data after user login

I am delving into the world of Vue JS for the first time, and I have a navigation bar that displays two buttons - 'Login' and 'Sign Up', with a third button 'Logout' hidden until the user is logged in.

To handle the visibility of these buttons, I used

<template v-if="authenticated">
to show the logout button when the user is authenticated, and <template v-else> to display the login and registration forms as Bootstrap 4 modals.

The authentication status is controlled through the variable authenticated using the following methods:

    data: function() {
      return {
        authenticated: false
      }
    },
    methods: {
      logout: function() {
        this.$session.destroy()
      }
    },
    created() {
      this.authenticated = this.$session.exists()
    },

The navigation bar is housed in a separate component, while the login and registration forms each reside within their own modal.

  <template v-if="authenticated">
    <li class="nav-item">
      <a href="#" v-on:click="logout" class="nav-link">Logout</a>
    </li>
  </template>
  <template v-else>
    <li class="nav-item">
      <a class="nav-link" data-target="#signup" data-toggle="modal" href="#signup">Sign Up</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" data-target="#login" data-toggle="modal" href="#login">Login</a>
    </li>
  </template>

However, despite logging my authenticated state, there seems to be an issue with its update.

Answer №1

It seems like many people encounter this particular problem. An effective method to trigger a component rerender is by including a 'key' prop with the complete path value when utilizing the component. Here's an example:

<Header :key="$router.path"></Header>

Answer №2

Revise the following code:

  methods: {
       logout: function() {
         this.$session.destroy()
       }
  }

Update it to:

  methods: {
       logout: function() {
         this.$session.destroy();
         this.authenticated = false;
       }
  }

Ensure that your authenticated variable reflects that you have logged out. Other than that, your code should function as expected.

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