Button groups in Bootsrap - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a button group in Bootstrap?

A button group in Bootstrap is a way to group multiple buttons together on a single line, making them look connected and organized.

beginner

Which Bootstrap class is used to create a button group container?

The class .btn-group is used to wrap buttons and create a button group.

intermediate

How do you make a vertical button group in Bootstrap?

Add the class .btn-group-vertical to the container instead of .btn-group to stack buttons vertically.

intermediate

What role does the aria-label attribute play in button groups?

It improves accessibility by describing the group of buttons to screen readers, helping users understand the purpose of the group.

intermediate

How can you add spacing between buttons inside a button group?

Button groups remove spacing by default to connect buttons. To add space, you can use margin utilities like me-2 on buttons or avoid grouping them.

Which class creates a horizontal button group in Bootstrap?

A .btn-group

B .btn-group-vertical

C .btn-group-horizontal

D .btn-group-row

The class .btn-group creates a horizontal button group. .btn-group-vertical stacks buttons vertically.

What is the purpose of using aria-label on a button group?

A To add color to buttons

B To change button size

C To make buttons clickable

D To describe the button group for screen readers

aria-label helps screen readers understand the purpose of the button group, improving accessibility.

How do you create a vertical stack of buttons in Bootstrap?

A Use .btn-group and add flex-column

B Use .btn-group-vertical

C Use .btn-vertical

D Use .btn-stack

Bootstrap provides the .btn-group-vertical class to stack buttons vertically.

If you want buttons in a group to have space between them, what should you do?

A Add margin classes like me-2 to buttons

B Use .btn-group with no changes

C Use .btn-space class

D Add padding to the button group container

Button groups connect buttons tightly by default. Adding margin classes like me-2 adds space between buttons.

Which HTML element is recommended to wrap buttons in a Bootstrap button group?

A <nav>

B <section>

C <div>

D <button>

A

with the .btn-group class is commonly used to wrap buttons in a group.

Explain how to create a horizontal and a vertical button group in Bootstrap. Include accessibility considerations.

Think about the container classes and how screen readers understand groups.

Describe how you can add spacing between buttons inside a Bootstrap button group and why you might want to do that.

Consider Bootstrap's default button group behavior and margin utilities.

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