Button groups in Bootsrap - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ rendering

intermediate

What is the visual output of this Bootstrap button group?

Look at the following HTML code using Bootstrap 5. What will you see rendered in the browser?

Bootsrap

<div class="btn-group" role="group" aria-label="Basic example">
  <button type="button" class="btn btn-primary">Left</button>
  <button type="button" class="btn btn-primary">Middle</button>
  <button type="button" class="btn btn-primary">Right</button>
</div>

A Three separate blue buttons spaced apart horizontally with no border connecting them.

B A vertical stack of three blue buttons with equal spacing between them.

C A horizontal group of three blue buttons touching each other with no gaps, forming a single connected shape.

D Three blue buttons arranged diagonally from top-left to bottom-right.

💡 Hint

Bootstrap's btn-group class groups buttons horizontally with no gaps.

The btn-group class in Bootstrap groups buttons side-by-side horizontally with no gaps, making them appear connected as a single unit.

❓ selector

intermediate

Which attribute ensures accessibility for a Bootstrap button group?

In Bootstrap button groups, which attribute is important to add for screen readers to understand the group?

A aria-label

B data-toggle

C role="button"

D tabindex="0"

💡 Hint

Think about how screen readers identify groups of controls.

The aria-label attribute provides a descriptive label for the button group, helping screen readers announce the group purpose.

📝 Syntax

advanced

What error occurs with this Bootstrap button group code?

Examine this code snippet. What error or problem will it cause when rendered?

Bootsrap

<div class="btn-group" aria-label="Group">
  <button class="btn btn-secondary">One</button>
  <button class="btn btn-secondary">Two</button>
  <button class="btn btn-secondary">Three</button>
</div>

A Buttons will be grouped horizontally but will not be clickable.

B Screen readers will not recognize the buttons as a group because the role="group" attribute is missing.

C Buttons will be grouped but have no color styling because btn-secondary is invalid.

D Buttons will stack vertically because btn-group requires an extra class for horizontal layout.

💡 Hint

Bootstrap uses role="group" to identify button groups for assistive technologies.

Without role="group", assistive technologies may not recognize the buttons as a group, reducing accessibility.

❓ layout

advanced

How to create a vertical button group in Bootstrap?

Which class combination creates a vertical stack of buttons grouped together in Bootstrap 5?

A Use class="btn-group-vertical" on the container div.

B Use class="btn-group" and add CSS flex-direction: column manually.

C Use class="btn-vertical" on each button inside btn-group.

D Use class="btn-group" with role="vertical" attribute.

💡 Hint

Bootstrap provides a special class for vertical button groups.

The btn-group-vertical class stacks buttons vertically with proper spacing and styling.

🧠 Conceptual

expert

Why use role="group" with aria-label in Bootstrap button groups?

What is the main reason to add role="group" and aria-label attributes to a Bootstrap button group container?

A To make buttons responsive and adjust their size on different screen widths.

B To enable Bootstrap's JavaScript to activate button toggling functionality.

C To apply default Bootstrap styling for grouped buttons automatically.

D To improve keyboard navigation and provide screen readers a clear description of the button group.

💡 Hint

Think about accessibility and how assistive devices interpret grouped controls.

role="group" defines the container as a group of related controls, and aria-label gives a descriptive name, helping screen readers and keyboard users understand the group context.

Practice

1. What is the main purpose of using the btn-group class in Bootstrap?

easy

A. To group multiple buttons side by side as a single unit

B. To change the color of a button

C. To add icons inside buttons

D. To create dropdown menus

Solution

1. Step 1: Understand the role of btn-group

   The btn-group class is designed to place buttons next to each other horizontally, making them appear as one group.

2. Step 2: Compare with other options

   Changing colors, adding icons, or dropdowns require different classes or components, not btn-group.

3. Final Answer:

   To group multiple buttons side by side as a single unit -> Option A

4. Quick Check:

   Button groups = group buttons side by side [OK]

Hint: Remember: btn-group means buttons together horizontally [OK]

Common Mistakes:

• Confusing btn-group with button color classes
• Thinking btn-group creates dropdowns
• Assuming btn-group adds icons automatically

2. Which of the following is the correct syntax to create a horizontal button group with three buttons labeled 'One', 'Two', and 'Three'?

easy

A. OneTwoThree

B. OneTwoThree

C. OneTwoThree

D. OneTwoThree

Solution

1. Step 1: Check the container class and role

   The correct class for horizontal grouping is btn-group with role='group' for accessibility.

2. Step 2: Verify button elements and labels

   Buttons inside should have btn and style classes like btn-primary. The role must be 'group', not 'button'.

3. Final Answer:

   Correct horizontal button group with role='group' -> Option B

4. Quick Check:

   btn-group + role='group' = horizontal group [OK]

Hint: Use role='group' with btn-group for horizontal groups [OK]

Common Mistakes:

• Using btn-group-vertical for horizontal groups
• Setting role='button' instead of role='group'
• Missing role attribute for accessibility

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

<div class='btn-group btn-group-lg' role='group' aria-label='Large button group'>
  <button type='button' class='btn btn-secondary'>Left</button>
  <button type='button' class='btn btn-secondary'>Middle</button>
  <button type='button' class='btn btn-secondary'>Right</button>
</div>

medium

A. Three small buttons stacked vertically

B. Three large buttons stacked vertically

C. Three medium buttons aligned horizontally side by side

D. Three large buttons aligned horizontally side by side

Solution

1. Step 1: Analyze the classes used

   The btn-group class groups buttons horizontally. The btn-group-lg class makes buttons larger in size.

2. Step 2: Understand the layout effect

   Buttons inside will appear side by side horizontally, not stacked vertically, and will be large due to btn-group-lg.

3. Final Answer:

   Three large buttons aligned horizontally side by side -> Option D

4. Quick Check:

   btn-group + btn-group-lg = large horizontal buttons [OK]

Hint: btn-group-lg means bigger horizontal buttons [OK]

Common Mistakes:

• Confusing vertical stacking with horizontal grouping
• Ignoring size classes like btn-group-lg
• Assuming default size when btn-group-lg is present

4. Identify the error in this Bootstrap button group code:

<div class='btn-group' aria-label='Button group'>
  <button class='btn btn-primary'>A</button>
  <button class='btn btn-primary'>B</button>
  <button class='btn btn-primary'>C</button>
</div>

medium

A. Buttons should use type='submit' instead of default

B. Class btn-primary is invalid for buttons

C. Missing role='group' attribute on the container div

D. The container should be a nav element instead of div

Solution

1. Step 1: Check accessibility roles

   Bootstrap button groups require role='group' on the container for screen readers to understand the grouping.

2. Step 2: Validate other attributes and tags

   Button type defaults to 'button' which is fine. btn-primary is a valid class. Using div is correct for button groups.

3. Final Answer:

   Missing role='group' attribute on the container div -> Option C

4. Quick Check:

   Button groups need role='group' for accessibility [OK]

Hint: Always add role='group' on btn-group container for accessibility [OK]

Common Mistakes:

• Omitting role='group' on the button group container
• Confusing button type attribute necessity
• Thinking btn-primary is invalid

5. You want to create a vertical button group with three buttons labeled 'Yes', 'No', and 'Maybe' that is also large in size. Which is the correct Bootstrap code snippet?

hard

A. \n Yes\n No\n Maybe\n

B. \n Yes\n No\n Maybe\n

C. \n Yes\n No\n Maybe\n

D. \n Yes\n No\n Maybe\n

Solution

1. Step 1: Identify vertical grouping class

   The class btn-group-vertical makes the buttons stack vertically.

2. Step 2: Combine vertical grouping with large size

   Adding btn-group-lg alongside btn-group-vertical on the container makes the entire group large and vertical.

3. Step 3: Check button classes

   Buttons have appropriate color classes and do not need individual btn-lg if the group is large.

4. Final Answer:

   Use btn-group-vertical btn-group-lg on container with role='group' -> Option A

5. Quick Check:

   btn-group-vertical + btn-group-lg = large vertical group [OK]

Hint: Combine btn-group-vertical and btn-group-lg on container for large vertical group [OK]

Common Mistakes:

• Using btn-group-lg without btn-group-vertical for vertical layout
• Adding btn-lg to buttons instead of group container
• Mixing btn-group and btn-group-vertical classes incorrectly