Accordion component in Bootsrap - Mini Project: Build & Apply

Build a Bootstrap Accordion Component

📖 Scenario: You are creating a simple FAQ section for a website using Bootstrap's accordion component. This will help users easily find answers by expanding and collapsing questions.

🎯 Goal: Build a functional Bootstrap accordion with three collapsible items, each with a question as the header and an answer as the body.

📋 What You'll Learn

Use Bootstrap 5 accordion structure

Create exactly three accordion items

Each item must have a unique id for collapse control

Use semantic HTML with button elements for toggling

Ensure accessibility with aria-controls and aria-expanded attributes

Accordion items should collapse and expand independently

💡 Why This Matters

🌍 Real World

Accordions are common in FAQs, menus, and content sections to save space and improve user experience by showing only relevant information.

💼 Career

Knowing how to implement Bootstrap components is valuable for front-end developers working on responsive and accessible websites quickly.

1

Create the basic accordion container

Create a div with class="accordion" and id="faqAccordion" to hold the accordion items.

Bootsrap

Hint

The accordion container needs a class accordion and an id faqAccordion.

2

Add the first accordion item

Inside the div with id="faqAccordion", add the first accordion item with id="headingOne" for the header and id="collapseOne" for the collapsible body. The header button text should be "What is Bootstrap?" and the body text should be "Bootstrap is a CSS framework for building responsive websites.".

Bootsrap

Hint

Use accordion-item, accordion-header, and accordion-button classes. The button toggles the collapse with data-bs-toggle and data-bs-target.

3

Add the second and third accordion items

Add two more accordion items inside the div with id="faqAccordion". Use id="headingTwo" and id="collapseTwo" for the second item, and id="headingThree" and id="collapseThree" for the third. The second header text is "How do I include Bootstrap?" with body "You can include Bootstrap via CDN or by downloading the files.". The third header text is "Is Bootstrap free to use?" with body "Yes, Bootstrap is open source and free to use.". Ensure each button toggles its respective collapse area and uses correct aria attributes.

Bootsrap

  
    
      
        What is Bootstrap?
      
    
    
      
        Bootstrap is a CSS framework for building responsive websites.
      
    
  
  

Hint

Remember to add collapsed class to buttons that start closed and set aria-expanded="false".

4

Add Bootstrap CSS and JS links

Add the Bootstrap 5 CSS link inside the <head> and the Bootstrap 5 JavaScript bundle script before the closing </body> tag. Use the official Bootstrap CDN URLs for version 5.3. Make sure the accordion will work with these included.

Bootsrap

  
  
  FAQ Accordion
  



  

Hint

Use the official Bootstrap 5.3 CDN links for CSS and JS bundle to enable styling and accordion functionality.

Practice

1. What is the main purpose of the Accordion component in Bootstrap?

easy

A. To create a navigation bar with dropdown menus

B. To show and hide sections of content by expanding or collapsing them

C. To display images in a sliding carousel

D. To style buttons with different colors

Solution

1. Step 1: Understand Accordion functionality

   The Accordion component is designed to toggle visibility of content sections by expanding or collapsing them.

2. Step 2: Compare with other Bootstrap components

   Navigation bars, carousels, and buttons serve different purposes unrelated to content toggling.

3. Final Answer:

   To show and hide sections of content by expanding or collapsing them -> Option B

4. Quick Check:

   Accordion = toggle content visibility [OK]

Hint: Accordion toggles content sections open or closed [OK]

Common Mistakes:

• Confusing Accordion with navigation menus
• Thinking Accordion is for image sliders
• Assuming Accordion styles buttons

2. Which of the following is the correct HTML structure to start an Accordion in Bootstrap 5?

easy

A. <div class='accordion' id='myAccordion'>

B. <accordion id='myAccordion'>

C. <div class='accordion-item'>

D. <section class='accordion-collapse'>

Solution

1. Step 1: Identify the container element for Accordion

   The Accordion container uses a div with class accordion and an ID for reference.

2. Step 2: Check Bootstrap 5 syntax

   Bootstrap 5 requires div.accordion as the wrapper, not accordion tag or other classes like accordion-item or accordion-collapse alone.

3. Final Answer:

   <div class='accordion' id='myAccordion'> -> Option A

4. Quick Check:

   Accordion container = div.accordion [OK]

Hint: Accordion always starts with div.accordion container [OK]

Common Mistakes:

• Using a non-existent <accordion> tag
• Starting with accordion-item instead of accordion container
• Confusing collapse section with container

3. Given this Accordion item code snippet, what will happen when the button is clicked?

<div class='accordion-item'>
  <h2 class='accordion-header' id='headingOne'>
    <button class='accordion-button' type='button' data-bs-toggle='collapse' data-bs-target='#collapseOne' aria-expanded='true' aria-controls='collapseOne'>
      Section 1
    </button>
  </h2>
  <div id='collapseOne' class='accordion-collapse collapse show' aria-labelledby='headingOne' data-bs-parent='#myAccordion'>
    <div class='accordion-body'>Content 1</div>
  </div>
</div>

medium

A. The entire accordion will reload the page

B. Nothing will happen because the button lacks a click event

C. The content inside 'Content 1' will collapse or expand when the button is clicked

D. The button will change color but content stays visible

Solution

1. Step 1: Analyze button attributes for toggle

   The button has data-bs-toggle='collapse' and data-bs-target='#collapseOne', linking it to the collapsible content.

2. Step 2: Check the collapsible content state

   The content div has class collapse show, meaning it is visible initially and will toggle on button click.

3. Final Answer:

   The content inside 'Content 1' will collapse or expand when the button is clicked -> Option C

4. Quick Check:

   Button toggles collapse content visibility [OK]

Hint: data-bs-toggle='collapse' toggles content visibility [OK]

Common Mistakes:

• Assuming button does nothing without explicit JS
• Thinking button reloads page
• Confusing color change with content toggle

4. What is wrong with this Accordion code snippet that prevents it from working properly?

<div class='accordion' id='accordionExample'>
  <div class='accordion-item'>
    <h2 class='accordion-header' id='headingOne'>
      <button class='accordion-button' type='button' data-bs-toggle='collapse' data-bs-target='#collapseOne' aria-expanded='false' aria-controls='collapseOne'>
        Accordion Item #1
      </button>
    </h2>
    <div id='collapseOne' class='accordion-collapse' aria-labelledby='headingOne' data-bs-parent='#accordionExample'>
      <div class='accordion-body'>Content for item 1</div>
    </div>
  </div>
</div>

medium

A. The accordion-collapse div is missing the collapse class

B. The button should not have aria-expanded attribute

C. The data-bs-parent attribute should be on the button, not the collapse div

D. The accordion container is missing an ID

Solution

1. Step 1: Check classes on collapsible content

   The collapsible div must have class collapse to enable Bootstrap's collapse behavior.

2. Step 2: Verify other attributes

   The aria-expanded attribute on the button is correct and data-bs-parent belongs on the collapse div. The container has an ID.

3. Final Answer:

   The accordion-collapse div is missing the collapse class -> Option A

4. Quick Check:

   collapse class missing = no toggle [OK]

Hint: Always add 'collapse' class to collapsible content div [OK]

Common Mistakes:

• Forgetting the 'collapse' class on content div
• Misplacing data-bs-parent attribute
• Removing aria-expanded attribute

5. You want to create an Accordion where only one section can be open at a time, and the first section is open by default. Which combination of attributes and classes achieves this behavior correctly?

hard

A. Add data-bs-single='true' to buttons and expanded attribute on first button

B. Add data-bs-toggle='accordion' to buttons and active class to first button

C. Use data-bs-multiple='false' on accordion container and open class on first item

D. Add data-bs-parent to each collapse div and add show class to the first collapse div

Solution

1. Step 1: Understand Bootstrap's single-open behavior

   Bootstrap uses data-bs-parent on collapse divs to ensure only one section is open at a time.

2. Step 2: Set default open section

   Adding the show class to the first collapse div makes it open by default on page load.

3. Step 3: Evaluate other options

   Attributes like data-bs-toggle='accordion', data-bs-multiple, or data-bs-single do not exist in Bootstrap 5 for this purpose.

4. Final Answer:

   Add data-bs-parent to each collapse div and add show class to the first collapse div -> Option D

5. Quick Check:

   data-bs-parent + show class = single open with default [OK]

Hint: Use data-bs-parent and show class for single open accordion [OK]

Common Mistakes:

• Using non-existent Bootstrap attributes
• Forgetting to add show class for default open
• Misplacing data-bs-parent attribute