Badge component in Bootsrap - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Bootstrap badge component used for?

A Bootstrap badge is a small count or label that helps highlight new or unread items, status, or counts next to text or icons.

beginner

How do you add a badge to a button in Bootstrap?

You add a <span> with class badge inside the button element. For example:
<button class='btn btn-primary'>Inbox <span class='badge bg-secondary'>4</span></button>

beginner

What class do you use to change the color of a Bootstrap badge?

Use background utility classes like bg-primary, bg-success, bg-danger, etc., on the badge element to change its color.

beginner

How can you make a badge appear as a pill shape in Bootstrap?

Add the class rounded-pill to the badge element to make it have rounded edges like a pill.

intermediate

What accessibility feature should you consider when using badges?

Ensure badges have sufficient color contrast and use semantic HTML so screen readers can understand the badge content. Also, use aria-label if the badge content is not clear alone.

Which class is required to create a badge in Bootstrap?

A marker

B label

C badge

D tag

The class badge is used to create badge components in Bootstrap.

How do you make a Bootstrap badge have a pill shape?

A Add class rounded-pill

B Add class pill-badge

C Add class badge-pill

D Add class pill

The class rounded-pill makes badges pill-shaped in Bootstrap.

Which class changes the badge background color to green in Bootstrap?

A bg-danger

B bg-success

C bg-primary

D bg-warning

bg-success applies a green background color to badges.

Where should you place the badge element to show a count on a button?

A Inside the button element

B Outside the button element

C Before the button element

D In a separate div

The badge <span> should be inside the button element to appear attached.

What should you check to make badges accessible?

A Badge animation

B Badge size only

C Badge font only

D Color contrast and semantic HTML

Good color contrast and semantic HTML help badges be accessible to all users.

Explain how to create a badge in Bootstrap and customize its color and shape.

Think about the classes you add to a <span> element inside buttons or text.

Describe why accessibility matters for badges and how to improve it.

Consider users who rely on screen readers or have vision difficulties.

Practice

1. What is the main purpose of a Bootstrap badge component?

easy

A. To style form input fields

B. To create large banners for page headers

C. To add navigation menus

D. To highlight small pieces of information like counts or labels

Solution

1. Step 1: Understand the badge role

   Badges are used to show small bits of info such as counts or labels next to text or buttons.

2. Step 2: Compare options

   Options A, B, and C describe other Bootstrap components or uses, not badges.

3. Final Answer:

   To highlight small pieces of information like counts or labels -> Option D

4. Quick Check:

   Badge = small info highlight [OK]

Hint: Badges show small info like numbers or labels [OK]

Common Mistakes:

• Confusing badges with navigation or headers
• Thinking badges style large elements
• Using badges for form inputs

2. Which of the following is the correct syntax to create a Bootstrap badge with a primary color?

easy

A. New

B. New

C. New

D. New

Solution

1. Step 1: Check Bootstrap badge syntax

   Bootstrap badges use a span with class badge plus a background color class like bg-primary.

2. Step 2: Validate each option

   New uses correct tags and classes. Options A, B, and D use incorrect tags or class names.

3. Final Answer:

   <span class="badge bg-primary">New</span> -> Option C

4. Quick Check:

   Use span.badge.bg-primary [OK]

Hint: Use <span> with classes badge and bg-color [OK]

Common Mistakes:

• Using <div> instead of <span>
• Missing the 'badge' class
• Using wrong class names like badge-primary

3. What will be the visual result of this code?

<button type="button" class="btn btn-secondary">Messages <span class="badge bg-danger">5</span></button>

medium

A. A secondary button labeled 'Messages' with a red badge showing number 5

B. A red button labeled 'Messages' with a secondary badge showing number 5

C. A button labeled 'Messages' with no badge visible

D. A secondary button labeled 'Messages' with a blue badge showing number 5

Solution

1. Step 1: Analyze button and badge classes

   The button uses btn btn-secondary which styles it gray. The badge uses badge bg-danger which styles it red.

2. Step 2: Understand visual output

   The button text is 'Messages' and the badge with number 5 appears in red next to it.

3. Final Answer:

   A secondary button labeled 'Messages' with a red badge showing number 5 -> Option A

4. Quick Check:

   btn-secondary + badge bg-danger = gray button + red badge [OK]

Hint: bg-danger means red badge color [OK]

Common Mistakes:

• Confusing button and badge colors
• Expecting badge to be blue or missing
• Ignoring badge inside button

4. Identify the error in this badge code:

<span class="badge badge-primary">99</span>

medium

A. The span tag cannot be used for badges

B. The class 'badge-primary' is outdated; should use 'bg-primary' instead

C. The number 99 is too large for a badge

D. Missing closing tag for span

Solution

1. Step 1: Check Bootstrap badge color class

   In Bootstrap 5+, color classes for badges use bg-primary, not badge-primary.

2. Step 2: Validate other parts

   The span tag is correct, number size is fine, and the closing tag is present.

3. Final Answer:

   The class 'badge-primary' is outdated; should use 'bg-primary' instead -> Option B

4. Quick Check:

   Use bg-primary, not badge-primary [OK]

Hint: Use bg-primary for badge color, not badge-primary [OK]

Common Mistakes:

• Using old Bootstrap 4 class names
• Thinking span is invalid tag
• Assuming number size matters

5. You want to add a badge inside a navigation link that shows the number of unread notifications. Which is the best way to do this for accessibility and styling?

<a href="#" class="nav-link">Notifications <?></a>

What should replace <?>?

hard

A. <span class="badge bg-info" aria-label="unread notifications">3</span>

B. <div class="badge bg-info">3</div>

C. <span class="badge bg-info"><strong>3</strong></span>

D. <span class="badge bg-info" role="button">3</span>

Solution

1. Step 1: Choose correct tag and classes

   Badges should use span with badge and color class like bg-info.

2. Step 2: Add accessibility attribute

   Adding aria-label describes the badge meaning for screen readers, improving accessibility.

3. Final Answer:

   <span class="badge bg-info" aria-label="unread notifications">3</span> -> Option A

4. Quick Check:

   Use span.badge with aria-label for accessibility [OK]

Hint: Use aria-label on badge span for screen readers [OK]

Common Mistakes:

• Using div inside links (invalid HTML)
• Adding role=button unnecessarily
• Not adding aria-label for accessibility