Form control basics in Bootsrap - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a form control in Bootstrap?

A form control in Bootstrap is a styled HTML input element like text boxes, checkboxes, or selects that lets users enter or choose data easily and consistently.

beginner

How do you make a text input field using Bootstrap?

Use the <input> element with the class form-control. For example: <input type="text" class="form-control">.

beginner

Why should you use form-label with inputs?

The <code>form-label</code> class styles labels nicely and connects them to inputs for better accessibility and user experience.

beginner

What Bootstrap class do you use for a select dropdown?

Use the <code>form-select</code> class on the <code>&lt;select&gt;</code> element to get a styled dropdown.

beginner

How can you make a form control disabled in Bootstrap?

Add the disabled attribute to the input element. Bootstrap styles it to look inactive and prevents user interaction.

Which class do you add to an <input> to style it as a Bootstrap form control?

A form-input

B input-style

C control-input

D form-control

The correct Bootstrap class for styling inputs is form-control.

What element and class combination creates a styled dropdown in Bootstrap?

A <code>&lt;select class="form-select"&gt;</code>

B <code>&lt;input type="dropdown" class="form-control"&gt;</code>

C <code>&lt;select class="form-control"&gt;</code>

D <code>&lt;dropdown class="form-select"&gt;</code>

Bootstrap uses <select> with the class form-select for dropdowns.

How do you disable a Bootstrap form control?

A Add the class <code>disabled-control</code>

B Add the attribute <code>disabled</code> to the input

C Add the class <code>form-disabled</code>

D Wrap input in <code>&lt;div class="disabled"&gt;</code>

The standard way is to add the disabled attribute; Bootstrap styles it accordingly.

Why is it important to use <label> with form controls?

A It makes the input required

B It changes the input color automatically

C It improves accessibility and links the label to the input

D It disables the input

Labels help screen readers and users by linking text to inputs.

Which Bootstrap class styles a checkbox input?

A form-check-input

B form-control

C form-checkbox

D checkbox-control

Checkboxes use the form-check-input class in Bootstrap.

Explain how to create a basic text input form control using Bootstrap.

Think about the HTML tag, the class to add, and how to connect a label.

Describe the purpose of Bootstrap form control classes and how they improve user experience.

Consider why uniform look and accessibility matter in forms.

Practice

1. What is the main purpose of the form-control class in Bootstrap?

easy

A. To format tables

B. To create navigation bars

C. To add animations to buttons

D. To style input elements like text boxes consistently

Solution

1. Step 1: Understand the role of form-control

   The form-control class is used to style form inputs such as text boxes, textareas, and selects.

2. Step 2: Identify what it does visually

   It makes form inputs look consistent and user-friendly across browsers.

3. Final Answer:

   To style input elements like text boxes consistently -> Option D

4. Quick Check:

   Bootstrap form-control styles inputs [OK]

Hint: Remember: form-control styles input fields [OK]

Common Mistakes:

• Confusing form-control with navigation or buttons
• Thinking it adds animations
• Assuming it styles tables

2. Which of the following is the correct way to apply Bootstrap styling to a text input field?

easy

A.

B.

C.

D.

Solution

1. Step 1: Recall Bootstrap's class for inputs

   Bootstrap uses the class form-control to style text inputs.

2. Step 2: Match the correct class name

   Only uses form-control correctly.

3. Final Answer:

   <input type="text" class="form-control"> -> Option B

4. Quick Check:

   Bootstrap input class = form-control [OK]

Hint: Use exactly 'form-control' class for inputs [OK]

Common Mistakes:

• Using incorrect class names like form-input or input-style
• Swapping words in class names
• Missing the class attribute

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

<input type="email" class="form-control" placeholder="Enter email" aria-label="Email address">

medium

A. A styled email input box with placeholder text and accessible label

B. A plain input box without any styling or placeholder

C. A button labeled 'Enter email'

D. An error because aria-label is invalid here

Solution

1. Step 1: Analyze the input element

   The input is of type email, has the Bootstrap class form-control, a placeholder, and an ARIA label.

2. Step 2: Understand the visual and accessibility effects

   The form-control class styles the input nicely. The placeholder shows faint text inside the box. The aria-label helps screen readers identify the input as 'Email address'.

3. Final Answer:

   A styled email input box with placeholder text and accessible label -> Option A

4. Quick Check:

   form-control + placeholder + aria-label = styled accessible input [OK]

Hint: Placeholder shows text; aria-label helps screen readers [OK]

Common Mistakes:

• Thinking aria-label causes errors
• Confusing input with button
• Ignoring placeholder effect

4. Identify the error in this Bootstrap form control code:

<input type="text" class="form-control" placeholder="Name" aria-lable="User name">

medium

A. The attribute 'aria-lable' is misspelled

B. The class name 'form-control' is misspelled

C. The placeholder attribute is invalid

D. The input type 'text' is not supported

Solution

1. Step 1: Check class and attributes

   The class form-control is spelled correctly. The placeholder is valid. The input type 'text' is supported.

2. Step 2: Spot the typo in ARIA attribute

   The attribute aria-lable is misspelled; it should be aria-label.

3. Final Answer:

   The attribute 'aria-lable' is misspelled -> Option A

4. Quick Check:

   ARIA attribute spelling matters [OK]

Hint: Check ARIA attribute spelling carefully [OK]

Common Mistakes:

• Misspelling aria-label as aria-lable
• Assuming placeholder is wrong
• Thinking form-control is misspelled

5. You want to create a dropdown menu for selecting a country using Bootstrap. Which code snippet correctly applies Bootstrap form control classes and accessibility best practices?

hard

A. <select class="form-select" aria-label="Country selector"><option>USA</option><option>Canada</option></select>

B. <select class="form-control" aria-labelledby="country"><option>USA</option><option>Canada</option></select>

C. <select class="form-select" aria-label="Country selector"><option selected>Select country</option><option>USA</option><option>Canada</option></select>

D. <select class="form-control" aria-label="country"><option>USA</option><option>Canada</option></select>

Solution

1. Step 1: Identify correct Bootstrap class for dropdowns

   Bootstrap uses form-select for styling select dropdowns, not form-control.

2. Step 2: Check accessibility and usability

   Using aria-label="Country selector" provides an accessible name. Including a default option like Select country with selected guides users.

3. Step 3: Compare options

   <select class="form-select" aria-label="Country selector"><option selected>Select country</option><option>USA</option><option>Canada</option></select> uses form-select, has an accessible label, and a default selected option, making it best practice.

4. Final Answer:

   <select class="form-select" aria-label="Country selector"><option selected>Select country</option><option>USA</option><option>Canada</option></select> -> Option C

5. Quick Check:

   Dropdown = form-select + aria-label + default option [OK]

Hint: Use form-select for dropdowns with aria-label and default option [OK]

Common Mistakes:

• Using form-control instead of form-select for selects
• Missing accessible labels
• Not providing a default option