Responsive tables in Bootsrap - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

What does the .table-responsive class do in Bootstrap?

Choose the correct description of the .table-responsive class in Bootstrap.

A It makes the table horizontally scrollable on small screens to prevent overflow.

B It converts the table into a list on small screens.

C It changes the table background color on small screens.

D It automatically hides columns on small screens to fit the table.

💡 Hint

Think about how tables behave on narrow devices and how Bootstrap helps with that.

The .table-responsive class wraps a table and adds horizontal scrolling on small devices. This prevents the table from breaking the layout by overflowing the screen width.

📝 Syntax

intermediate

Which Bootstrap class makes a table responsive only on screens smaller than 768px?

Select the correct Bootstrap class that makes a table responsive only on devices smaller than 768px wide.

A table-responsive-lg

B table-responsive-xl

C table-responsive-md

D table-responsive-sm

💡 Hint

Bootstrap uses size abbreviations like sm, md, lg, xl for breakpoints.

The table-responsive-md class applies horizontal scrolling only on screens smaller than the md breakpoint (768px). Larger screens show the table normally.

❓ rendering

advanced

What will be the visual result of this Bootstrap table code?

Given the following HTML code, what will the user see on a narrow mobile screen?

Bootsrap

<div class="table-responsive">
  <table class="table">
    <thead>
      <tr><th>Name</th><th>Age</th><th>City</th></tr>
    </thead>
    <tbody>
      <tr><td>Alice</td><td>30</td><td>New York</td></tr>
      <tr><td>Bob</td><td>25</td><td>Chicago</td></tr>
    </tbody>
  </table>
</div>

A The table columns will stack vertically, showing each cell on a new line.

B The table will have a horizontal scrollbar allowing side-to-side scrolling.

C The table will be hidden on small screens.

D The table will shrink to fit the screen width without scrolling.

💡 Hint

Remember what the .table-responsive wrapper does on small screens.

The .table-responsive wrapper adds horizontal scrolling on small screens, so the table remains in a row format but can be scrolled sideways.

❓ selector

advanced

Which CSS selector targets only tables inside .table-responsive containers?

Choose the correct CSS selector to style only tables wrapped by .table-responsive in Bootstrap.

A .table-responsive > table

B table.table-responsive

C table > .table-responsive

D .table-responsive table

💡 Hint

Think about how to select a child element inside a container.

The selector .table-responsive table selects any table element inside an element with class table-responsive, regardless of nesting depth.

❓ accessibility

expert

How to improve accessibility for responsive Bootstrap tables?

Which practice best improves accessibility for users navigating responsive tables on small screens?

A Add <code>aria-label</code> to the <code>table</code> describing its content and ensure keyboard scroll support.

B Use only color to indicate important data differences in the table.

C Hide table headers on small screens to save space.

D Disable horizontal scrolling to force table stacking.

💡 Hint

Think about screen readers and keyboard users when tables scroll horizontally.

Adding aria-label helps screen readers understand the table's purpose. Ensuring keyboard users can scroll horizontally is essential for accessibility.

Practice

1. What is the main purpose of wrapping a table inside a div with the class table-responsive in Bootstrap?

easy

A. To center the table on the page

B. To add borders around the table cells

C. To change the table background color

D. To make the table horizontally scrollable on small screens

Solution

1. Step 1: Understand the role of table-responsive

   The table-responsive class wraps the table and adds horizontal scrolling on smaller screens.

2. Step 2: Compare with other options

   Adding borders or changing background color is done with other classes like table-bordered or CSS, not table-responsive.

3. Final Answer:

   To make the table horizontally scrollable on small screens -> Option D

4. Quick Check:

   Responsive tables scroll horizontally on small screens [OK]

Hint: Remember: table-responsive enables horizontal scroll [OK]

Common Mistakes:

• Confusing table-responsive with styling classes
• Thinking it centers the table
• Assuming it changes colors

2. Which of the following is the correct way to make a Bootstrap table responsive?

easy

A. <div class='table-responsive'><table class='table'>...</table></div>

B. <table class='table-responsive table'>...</table>

C. <div class='responsive-table'><table class='table'>...</table></div>

D. <table class='table' responsive>...</table>

Solution

1. Step 1: Recall Bootstrap responsive table syntax

   Bootstrap requires wrapping the <table> inside a <div> with class table-responsive.

2. Step 2: Check each option

   <div class='table-responsive'><table class='table'>...</table></div> correctly wraps the table inside div.table-responsive. The other options use incorrect class names or attributes.

3. Final Answer:

   <div class='table-responsive'><table class='table'>...</table></div> -> Option A

4. Quick Check:

   Wrap table in div.table-responsive [OK]

Hint: Wrap tables in div.table-responsive for responsiveness [OK]

Common Mistakes:

• Adding table-responsive directly to table
• Using wrong class names like responsive-table
• Using attributes instead of classes

3. What will happen when the following code is viewed on a small mobile screen?

<div class='table-responsive'>
  <table class='table table-striped'>
    <thead>
      <tr><th>Name</th><th>Age</th></tr>
    </thead>
    <tbody>
      <tr><td>Alice</td><td>30</td></tr>
      <tr><td>Bob</td><td>25</td></tr>
    </tbody>
  </table>
</div>

medium

A. The table columns will stack vertically automatically

B. The table will scroll horizontally if it doesn't fit the screen

C. The table will be hidden on small screens

D. The table will overflow outside the screen without scroll

Solution

1. Step 1: Understand table-responsive behavior

   The table-responsive wrapper adds horizontal scrolling on small screens if the table is wider than the viewport.

2. Step 2: Analyze other options

   The table columns do not stack vertically automatically (that requires other techniques). The table is not hidden, and it won't overflow without scroll because of the wrapper.

3. Final Answer:

   The table will scroll horizontally if it doesn't fit the screen -> Option B

4. Quick Check:

   Responsive tables scroll horizontally on small devices [OK]

Hint: Responsive tables scroll horizontally on small screens [OK]

Common Mistakes:

• Thinking columns stack vertically automatically
• Assuming table hides on small screens
• Ignoring horizontal scroll behavior

4. You wrote this code but the table does not scroll on small screens:

<table class='table table-bordered'>
  <thead>
    <tr><th>Product</th><th>Price</th></tr>
  </thead>
  <tbody>
    <tr><td>Book</td><td>$10</td></tr>
  </tbody>
</table>

What is the fix?

medium

A. Add inline style overflow-x: scroll; to the table

B. Add class table-responsive directly to the table

C. Wrap the table inside a div with class table-responsive

D. Replace table-bordered with table-responsive

Solution

1. Step 1: Identify missing wrapper

   The table is missing the required div.table-responsive wrapper that enables horizontal scrolling on small screens.

2. Step 2: Evaluate other options

   Adding table-responsive class directly to table or replacing table-bordered is incorrect. Inline styles on table won't work properly for responsiveness.

3. Final Answer:

   Wrap the table inside a div with class table-responsive -> Option C

4. Quick Check:

   Wrap tables in div.table-responsive for scroll [OK]

Hint: Always wrap tables in div.table-responsive for scrolling [OK]

Common Mistakes:

• Adding table-responsive class to table instead of wrapper
• Removing other styling classes
• Using inline styles on table instead of wrapper

5. You want to create a responsive table that has striped rows and borders, but only scrolls horizontally on screens smaller than medium size (less than 768px). Which Bootstrap class should you use to wrap the table?

hard

A. table-responsive-md

B. table-responsive

C. table-responsive-sm

D. table-responsive-lg

Solution

1. Step 1: Understand Bootstrap responsive table breakpoints

   Bootstrap provides responsive wrappers like table-responsive-sm, table-responsive-md, etc., which enable horizontal scrolling below the specified breakpoint.

2. Step 2: Match requirement with class

   To scroll only on screens smaller than medium (less than 768px), use table-responsive-md. This means scrolling activates below the medium breakpoint.

3. Final Answer:

   table-responsive-md -> Option A

4. Quick Check:

   Use table-responsive-md for scroll below medium screens [OK]

Hint: Use breakpoint suffixes like -md for responsive scroll [OK]

Common Mistakes:

• Using table-responsive without breakpoint (scrolls always)
• Confusing breakpoint suffixes
• Using wrong breakpoint class for desired screen size