Error.tsx for route errors in NextJS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the necessary React function for the error component.

NextJS

import React, { [1] } from 'react';

Drag options to blanks, or click blank then click option'

AuseRouteError

BuseEffect

CuseError

DuseState

Attempts:

3 left

💡 Hint

Common Mistakes

Using hooks unrelated to error handling like useState or useEffect.

Trying to import a hook named useError which does not exist.

The useRouteError hook is used in Next.js error components to get the error details for route errors.

2fill in blank

medium

Complete the code to get the error object inside the Error component.

NextJS

export default function Error() {
  const error = [1]();
  return <div>An error occurred.</div>;
}

Drag options to blanks, or click blank then click option'

AuseRouteError

BuseError

CgetError

DuseEffect

Attempts:

3 left

💡 Hint

Common Mistakes

Using hooks that do not return error objects like useEffect.

Trying to call a non-existent function getError.

The useRouteError hook returns the error object for the current route error.

3fill in blank

hard

Fix the error in the JSX to display the error message safely.

NextJS

return <div>Error: [1]</div>;

Drag options to blanks, or click blank then click option'

Aerror.message()

Berror.toString()

Cerror.message

Derror

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to call error.message as a function.

Rendering the whole error object directly.

The error.message property contains the error message string. Using error directly or calling message() causes errors.

4fill in blank

hard

Fill both blanks to create a semantic error message with a heading and paragraph.

NextJS

return (
  <section aria-labelledby=[1]>
    <h1 id=[2]>Error Occurred</h1>
    <p>{error.message}</p>
  </section>
);

Drag options to blanks, or click blank then click option'

A"error-heading"

B"errorMessage"

D"main-heading"

Attempts:

3 left

💡 Hint

Common Mistakes

Using different strings for aria-labelledby and id.

Not using quotes around the string values.

The aria-labelledby attribute should match the id of the heading it labels. Using "error-heading" for both ensures accessibility.

5fill in blank

hard

Fill all three blanks to add a button that reloads the page on click.

NextJS

return (
  <div>
    <p>{error.message}</p>
    <button onClick=[1] aria-label=[2]>[3]</button>
  </div>
);

Drag options to blanks, or click blank then click option'

A() => window.location.reload()

B"Reload the page"

C"Reload"

D() => console.log('Reload')

Attempts:

3 left

💡 Hint

Common Mistakes

Using console.log instead of reloading the page.

Missing aria-label or using incorrect text.

The button's onClick should reload the page using window.location.reload(). The aria-label describes the button for screen readers, and the button text is "Reload".

Practice

1. What is the main purpose of the Error.tsx file in a Next.js route?

easy

A. To define the main layout of the application

B. To display a friendly message when a route fails or an error occurs

C. To handle user authentication and login

D. To fetch data from an API for the route

Solution

1. Step 1: Understand the role of Error.tsx in Next.js

   Error.tsx is designed to catch errors in routes and show a user-friendly message instead of a broken page.

2. Step 2: Compare with other options

   Layouts, authentication, and data fetching are handled elsewhere, not in Error.tsx.

3. Final Answer:

   To display a friendly message when a route fails or an error occurs -> Option B

4. Quick Check:

   Error.tsx shows friendly error messages [OK]

Hint: Error.tsx shows errors, not layouts or data [OK]

Common Mistakes:

• Confusing Error.tsx with layout or data files
• Thinking Error.tsx handles authentication
• Assuming Error.tsx fetches API data

2. Which of the following is the correct way to export a default Error component in Error.tsx for Next.js?

easy

A. export function Error() { return Error occurred; }

B. function Error() { return Error occurred; }

C. export default function Error() { return Error occurred; }

D. default export function Error() { return Error occurred; }

Solution

1. Step 1: Recall correct default export syntax in React/Next.js

   The correct syntax is to declare the function and export it as default in one statement.

2. Step 2: Identify syntax errors in other options

   function Error() { return
   Error occurred; } misses export, C exports a named function, D has invalid syntax.

3. Final Answer:

   export default function Error() { return <div>Error occurred</div>; } -> Option C

4. Quick Check:

   Default export uses 'export default function' [OK]

Hint: Default export needs 'export default function' [OK]

Common Mistakes:

• Forgetting to export the component
• Using named export instead of default
• Incorrect export syntax like 'default export'

3. Given this Error.tsx component, what will be rendered when an error occurs?

export default function Error() {
  return (
    <main role="alert" aria-live="assertive">
      <h1>Oops! Something went wrong.</h1>
      <button onClick={() => window.location.reload()}>Try Again</button>
    </main>
  );
}

medium

A. A heading with an error message and a button to reload the page

B. A blank page with no content

C. Only a button that does nothing

D. An error stack trace displayed to the user

Solution

1. Step 1: Analyze the JSX returned by the Error component

   The component returns a main element with a heading and a button that reloads the page on click.

2. Step 2: Understand the button behavior

   The button triggers window.location.reload(), so it reloads the current page when clicked.

3. Final Answer:

   A heading with an error message and a button to reload the page -> Option A

4. Quick Check:

   Error component shows message + reload button [OK]

Hint: Look for JSX elements and button onClick behavior [OK]

Common Mistakes:

• Assuming no content renders
• Thinking button does nothing
• Expecting error stack trace to show

4. What is wrong with this Error.tsx component code?

export default function Error() {
  return (
    <div>
      <h1>Error!</h1>
      <button onClick={reloadPage}>Reload</button>
    </div>
  );
}

function reloadPage() {
  location.reload;
}

medium

A. The reloadPage function does not call location.reload() correctly

B. The button should not have an onClick handler

C. The component must use a <main> tag instead of <div>

D. The function reloadPage should be inside the component

Solution

1. Step 1: Check the reloadPage function implementation

   location.reload is a function and must be called with parentheses: location.reload()

2. Step 2: Verify other parts

   The button can have onClick, using div is allowed, and reloadPage can be outside the component.

3. Final Answer:

   The reloadPage function does not call location.reload() correctly -> Option A

4. Quick Check:

   Call functions with parentheses to execute [OK]

Hint: Check if functions are called with () [OK]

Common Mistakes:

• Forgetting parentheses on function calls
• Thinking onClick is invalid on button
• Believing HTML tags must be <main>

5. You want to improve accessibility in your Error.tsx component by adding ARIA roles and live regions. Which of these changes is best practice?

hard

A. Use a <div> with aria-hidden="true" around the error message

B. Remove all ARIA attributes to keep it simple

C. Add tabindex="-1" to the button only

D. Wrap the error message in a <main> with role="alert" and aria-live="assertive"

Solution

1. Step 1: Understand ARIA roles for error messages

   Using role="alert" and aria-live="assertive" notifies screen readers immediately about errors.

2. Step 2: Evaluate other options

   aria-hidden="true" hides content from screen readers, tabindex="-1" on button is unrelated, removing ARIA reduces accessibility.

3. Final Answer:

   Wrap the error message in a <main> with role="alert" and aria-live="assertive" -> Option D

4. Quick Check:

   Use role="alert" and aria-live for error accessibility [OK]

Hint: Use role="alert" and aria-live="assertive" for errors [OK]

Common Mistakes:

• Hiding error messages from screen readers
• Misusing tabindex on unrelated elements
• Removing ARIA attributes thinking they are optional