Loading states pattern in Vue - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of a loading state in a Vue component?

A loading state shows users that data or content is being fetched or processed. It improves user experience by giving feedback instead of leaving the interface blank or frozen.

beginner

How do you declare a reactive loading state in Vue 3 Composition API?

Use <code>ref(false)</code> to create a reactive boolean. For example: <br><pre>const isLoading = ref(false)</pre>

beginner

What Vue directive helps conditionally show a loading spinner only when loading is true?

The v-if directive shows or hides elements based on a condition. For loading, use <div v-if="isLoading">Loading...</div>.

beginner

Why should you reset the loading state after data finishes loading?

Resetting loading to false hides the loading indicator and shows the loaded content. It signals to users that the process is complete.

intermediate

How can you handle loading states for multiple asynchronous operations in Vue?

You can use separate loading states for each operation or a combined state. For example, multiple ref variables or a reactive object holding all loading flags.

Which Vue feature is best to show a loading spinner only when data is loading?

A v-if directive

B v-for directive

C v-bind directive

D v-model directive

The v-if directive conditionally renders elements based on a boolean, perfect for showing a spinner only during loading.

In Vue 3 Composition API, which function creates a reactive loading state?

A reactive()

B ref()

C computed()

D watch()

ref() creates a reactive primitive like a boolean for loading states.

What should you do after an async data fetch finishes in Vue loading pattern?

A Set loading state to true

B Reload the page

C Ignore loading state

D Set loading state to false

Setting loading to false hides the loading indicator and shows the loaded content.

Why is showing a loading state important in user interfaces?

A To confuse users

B To show data instantly

C To give feedback that something is happening

D To slow down the app

Loading states give users feedback that the app is working and prevents confusion.

Which Vue 3 feature helps you run code when a component loads to start fetching data?

A onMounted

B watchEffect

C provide

D inject

onMounted runs code after the component is added to the page, good for starting data fetches.

Explain how to implement a loading state pattern in a Vue 3 component using the Composition API.

Think about reactive state and conditional rendering.

Why is it important to reset the loading state after data finishes loading in Vue apps?

Consider what users see and expect.