Spinner components in Bootsrap

Introduction

Spinners show that something is loading or working in the background. They help users know to wait.

When a page or data is loading slowly.

While waiting for a form to submit.

During file uploads or downloads.

When fetching information from the internet.

To show progress in background tasks.

Syntax

Bootsrap

<div class="spinner-border" role="status">
  <span class="visually-hidden">Loading...</span>
</div>

Use spinner-border for a rotating border spinner.

Always include role="status" and a span with visually-hidden text for accessibility.

Examples

Basic spinner with default size and color.

Bootsrap

<div class="spinner-border" role="status">
  <span class="visually-hidden">Loading...</span>
</div>

Spinner with blue color using Bootstrap's text-primary class.

Bootsrap

<div class="spinner-border text-primary" role="status">
  <span class="visually-hidden">Loading...</span>
</div>

Small spinner using spinner-border-sm class.

Bootsrap

<div class="spinner-border spinner-border-sm" role="status">
  <span class="visually-hidden">Loading...</span>
</div>

Growing spinner style with green color using spinner-grow and text-success.

Bootsrap

<div class="spinner-grow text-success" role="status">
  <span class="visually-hidden">Loading...</span>
</div>

Sample Program

This page shows three spinners centered vertically and horizontally. Each spinner uses different styles and colors to demonstrate Bootstrap spinner components. The visually-hidden text helps screen readers understand the spinner means loading.

Bootsrap

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <title>Bootstrap Spinner Example</title>
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet" />
</head>
<body>
  <main class="d-flex flex-column align-items-center justify-content-center vh-100 gap-3">
    <h1>Loading Data</h1>
    <div class="spinner-border text-primary" role="status" aria-label="Loading">
      <span class="visually-hidden">Loading...</span>
    </div>
    <div class="spinner-grow text-success" role="status" aria-label="Loading">
      <span class="visually-hidden">Loading...</span>
    </div>
    <div class="spinner-border spinner-border-sm text-danger" role="status" aria-label="Loading">
      <span class="visually-hidden">Loading...</span>
    </div>
  </main>
</body>
</html>

Important Notes

Spinners do not show progress amount, only that something is happening.

Use aria-label or role="status" with hidden text for screen reader support.

Customize spinner size with spinner-border-sm or CSS if needed.

Summary

Spinners visually show loading or processing states.

Bootstrap offers spinner-border and spinner-grow styles.

Always add accessible text inside spinners for screen readers.

Practice

1. What is the main purpose of Bootstrap spinner components?

easy

A. To show a loading or processing state visually

B. To create navigation menus

C. To style buttons with colors

D. To add images to the page

Solution

1. Step 1: Understand spinner usage

   Spinners are used to indicate that something is loading or processing in the background.

2. Step 2: Identify spinner purpose in Bootstrap

   Bootstrap spinner components visually show this loading state to users.

3. Final Answer:

   To show a loading or processing state visually -> Option A

4. Quick Check:

   Spinner = Loading indicator [OK]

Hint: Spinners always mean loading or waiting [OK]

Common Mistakes:

• Thinking spinners are for decoration only
• Confusing spinners with buttons
• Using spinners for static images

2. Which of the following is the correct Bootstrap class to create a border spinner?

easy

A. spinner-grow

B. spinner-spin

C. spinner-border

D. spinner-circle

Solution

1. Step 1: Recall Bootstrap spinner classes

   Bootstrap provides two main spinner classes: spinner-border and spinner-grow.

2. Step 2: Identify the border spinner class

   The class spinner-border creates a spinner with a border style.

3. Final Answer:

   spinner-border -> Option C

4. Quick Check:

   Border spinner class = spinner-border [OK]

Hint: Border spinner always uses spinner-border class [OK]

Common Mistakes:

• Using spinner-grow for border spinner
• Typing class names incorrectly
• Confusing spinner classes with button classes

3. What will be the visible result of this code snippet?

<div class="spinner-grow text-primary" role="status">
  <span class="visually-hidden">Loading...</span>
</div>

medium

A. A growing spinner with blue color and hidden accessible text

B. A border spinner with red color and visible text

C. A static blue circle with visible 'Loading...' text

D. No spinner shown, only text visible

Solution

1. Step 1: Analyze spinner-grow and text-primary classes

   The spinner-grow class creates a growing spinner animation. The text-primary class applies Bootstrap's primary blue color.

2. Step 2: Understand role and visually-hidden span

   The role="status" helps screen readers. The span with visually-hidden hides the text visually but keeps it accessible.

3. Final Answer:

   A growing spinner with blue color and hidden accessible text -> Option A

4. Quick Check:

   spinner-grow + text-primary = blue growing spinner [OK]

Hint: spinner-grow + text-primary = blue growing spinner [OK]

Common Mistakes:

• Thinking text-primary changes text color only
• Expecting visible text from visually-hidden span
• Confusing spinner-grow with spinner-border

4. Identify the error in this spinner code:

<div class="spinner-border" aria-label="Loading">
  <span>Loading...</span>
</div>

medium

A. aria-label should be aria-labelledby

B. Incorrect class name spinner-border

C. Missing role="status" attribute for accessibility

D. Span should have class visually-hidden for screen readers

Solution

1. Step 1: Check accessibility best practices for spinners

   Bootstrap recommends adding a span with visually-hidden class inside spinners to provide accessible text for screen readers.

2. Step 2: Analyze given code

   The span inside the spinner lacks the visually-hidden class, so the text is visible visually, which is not ideal.

3. Final Answer:

   Span should have class visually-hidden for screen readers -> Option D

4. Quick Check:

   Accessible text inside spinner needs visually-hidden class [OK]

Hint: Use visually-hidden class on spinner text for accessibility [OK]

Common Mistakes:

• Omitting visually-hidden class
• Using aria-label instead of role
• Confusing aria-label with aria-labelledby

5. You want to create a spinner that grows in size and uses the Bootstrap danger color with accessible text. Which code snippet correctly achieves this?

hard

A. Loading...

B. Loading...

C. Loading...

D. Loading...

Solution

1. Step 1: Choose spinner-grow for growing animation

   The question asks for a spinner that grows in size, so spinner-grow is the correct class.

2. Step 2: Apply danger color and accessibility

   The text-danger class applies the red color. The role="status" and span with visually-hidden provide accessible loading text.

3. Step 3: Verify all requirements

   Loading... uses spinner-grow, text-danger, role="status", and hidden accessible text correctly.

4. Final Answer:

   <div class="spinner-grow text-danger" role="status"><span class="visually-hidden">Loading...</span></div> -> Option B

5. Quick Check:

   Growing spinner + danger color + accessible text =
   Loading...
   [OK]

Hint: spinner-grow + text-danger + visually-hidden span = correct combo [OK]

Common Mistakes:

• Using spinner-border instead of spinner-grow
• Missing role="status"
• Not hiding accessible text visually