Problem with responsiveness in a Vue component

After some careful observation, I am perplexed by the reactivity behavior I have encountered. Initially, I had buttons on a navbar that were displayed conditionally in the app component (App.vue):

<button
 type="button"
 v-if="loggedIn()"
 @click="logout"
 class="btn btn-outline-light"
>

accompanied by the following script:

methods: {
   loggedIn() {
     return !(auth.getUser() == null);
   },

Everything was functioning correctly, and the logout button would appear once a user logged in. However, I recently decided to overhaul the design and transition to a sidebar layout. I created a sidebar component (SideBar.vue) with identical HTML and script. Strangely, the button stopped responding to changes. The only variation is that the navbar is present in App.vue while SideBar is a component of App structured like this :

<template>
  <div id="app">
    <div id="nav">
      <nav class="navbar navbar-expand-lg navbar-light ">
        // elements for the navbar with reactive buttons
      </nav>
      <side-bar />
    </div>
    <main>
     <router-view />
    </main>
  </div>
</template>

Modifications have been attempted, including using a computed property within the component but to no avail. I managed to make it function by passing a property from the app to the sidebar component, although I am not fond of this solution as scalability may become an issue later on. Any suggestions or ideas would be greatly appreciated. Thank you in advance.

Answer №1

The current structure seems to be causing issues. While it's recommended to use a computed property, the issue at hand is different.

Upon loading the app, ensure to call auth.getUser(), for example within the mounted() or created() lifecycle hook;

// Within Sidebar.vue or your main Vue component
{
    data() {
        return {
            user: null,
        };
    },
    created() {
        this.user = auth.getUser();
    },
}
<button
 type="button"
 v-if="user"
 @click="logout"
 class="btn btn-outline-light">

While you can include this logic in the sidebar component, it's often more beneficial to manage authentication at the root level or through Vuex for easier access across different parts of the application.

If you opt to add the created() method and user variable to your root component, you can reference it as follows;

<button
 type="button"
 v-if="$root.user"
 @click="logout"
 class="btn btn-outline-light">

Answer №2

It's not possible to use computed here, as a computed property doesn't update due to

return !(auth.getUser() === null)
not being a reactive dependency.

On the other hand, a method call will execute the function every time a re-render occurs. To address this issue, following the approach outlined by Michael Thiessen is recommended:

<side-bar :key="isLoggedIn()"/>

Answer №3

Implement a computed property for conditional rendering using v-if in the following way:

computed: {
  userLoggedIn () {
    return !(auth.getUser() === null)
  }
}

For more information, visit: https://v2.vuejs.org/v2/guide/computed.html

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