This example shows a component that loads after 2 seconds. While waiting, it shows a loading message. After 2 seconds, the async component appears with a greeting.
Suspense only works with async components or components that return promises.
You can customize the fallback content to anything like spinners, messages, or skeleton loaders.
Use Suspense to improve user experience by avoiding blank or frozen screens.
Summary
Suspense shows fallback content while async components load.
Wrap async components inside <Suspense> with a fallback template.
This makes apps feel faster and smoother for users.
Practice
(1/5)
1. What is the main purpose of the <Suspense> component in Vue?
easy
A. To show fallback content while async components are loading
B. To handle errors in synchronous components
C. To style components with CSS
D. To manage global state across components
Solution
Step 1: Understand what async components do
Async components load their code or data asynchronously, which can take some time.
Step 2: Role of <Suspense>
The <Suspense> component shows fallback content during this loading time to improve user experience.
Final Answer:
To show fallback content while async components are loading -> Option A
Quick Check:
Suspense = fallback content during loading [OK]
Hint: Suspense shows a placeholder while waiting for async parts [OK]
Common Mistakes:
Confusing Suspense with error handling
Thinking Suspense manages CSS or styling
Assuming Suspense manages global state
2. Which of the following is the correct way to use <Suspense> with a fallback in Vue?
easy
A. <Suspense><AsyncComp /><template fallback>Loading...</template></Suspense>
B. <Suspense fallback="Loading..."><AsyncComp /></Suspense>
C. <Suspense><template #fallback>Loading...</template><AsyncComp /></Suspense>
D. <Suspense><AsyncComp fallback="Loading..." /></Suspense>
Solution
Step 1: Check Vue Suspense syntax
Vue uses a named slot #fallback inside <Suspense> to show fallback content.
Step 2: Validate the options
<Suspense><template #fallback>Loading...</template><AsyncComp /></Suspense> correctly uses <template #fallback> with fallback text and wraps the async component inside Suspense.
Final Answer:
<Suspense><template #fallback>Loading...</template><AsyncComp /></Suspense> -> Option C
A. Fallback content must be a component, not a template
B. The fallback template must use #fallback slot syntax
C. Suspense cannot wrap async components
D. AsyncComp must be wrapped in a div
Solution
Step 1: Check fallback slot syntax
The fallback slot requires the named slot syntax #fallback inside <template>.
Step 2: Identify the error in code
The code uses <template fallback> instead of <template #fallback>, which is invalid.
Final Answer:
The fallback template must use #fallback slot syntax -> Option B
Quick Check:
Fallback slot needs #fallback syntax = The fallback template must use #fallback slot syntax [OK]
Hint: Use not for fallback slot [OK]
Common Mistakes:
Omitting the # in fallback slot
Wrapping async component unnecessarily
Thinking fallback must be a separate component
5. You want to show a loading spinner while two async components load in parallel inside Suspense. Which approach correctly shows fallback until both finish loading?
hard
A. <Suspense><template #fallback><Spinner /></template><AsyncComp1 /><AsyncComp2 /></Suspense>
B. <Suspense><AsyncComp1 /><template fallback><Spinner /></template><AsyncComp2 /></Suspense>
C. <Suspense><AsyncComp1 /><AsyncComp2 /></Suspense><template #fallback><Spinner /></template>
D. <Suspense><template #fallback><Spinner /></template><AsyncComp1 /></Suspense><Suspense><template #fallback><Spinner /></template><AsyncComp2 /></Suspense>
Solution
Step 1: Understand Suspense behavior with multiple async components
A single Suspense wrapping multiple async components waits for all to load before showing content.
Step 2: Check fallback placement
The fallback slot must be declared once inside Suspense before the async components to show fallback while any are loading.
Final Answer:
<Suspense><template #fallback><Spinner /></template><AsyncComp1 /><AsyncComp2 /></Suspense> -> Option A
Quick Check:
Single Suspense with fallback wraps all async components = <Suspense><template #fallback><Spinner /></template><AsyncComp1 /><AsyncComp2 /></Suspense> [OK]
Hint: Wrap all async components in one Suspense with fallback slot [OK]
Common Mistakes:
Placing fallback after async components
Using multiple Suspense components separately
Putting fallback outside Suspense
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