Form submission basics in HTML - Mini Project: Build & Apply

Form Submission Basics

📖 Scenario: You are creating a simple contact form for a website. Visitors will enter their name and email address to get in touch.

🎯 Goal: Build a basic HTML form with fields for name and email, and a submit button that sends the data.

📋 What You'll Learn

Use semantic HTML form elements

Include accessible labels for each input

Add a submit button

Set the form to send data using the POST method

Make sure the form has an action attribute pointing to '/submit'

💡 Why This Matters

🌍 Real World

Forms are everywhere on the web for collecting user information, like contact details, feedback, or orders.

💼 Career

Understanding form basics is essential for web developers to build interactive and accessible websites.

1

Create the HTML form skeleton

Write the opening <form> tag with action="/submit" and method="post". Then add two input fields: one text input with id="name" and one email input with id="email". Do not add labels or buttons yet.

HTML

Hint

Start by writing the <form> tag with the correct action and method attributes. Then add two input fields with the exact id and name attributes.

2

Add accessible labels for inputs

Add a <label> for the name input with for="name" and text "Name:". Add another <label> for the email input with for="email" and text "Email:". Place each label before its input field.

HTML

Hint

Use the <label> tag with the for attribute matching the input's id. Put the label text inside the label tags.

3

Add a submit button

Add a submit button inside the form using <button> with type="submit" and the text "Send".

HTML

  Name:
  
  Email:
  
  

Hint

Use a <button> tag with type="submit" and put the text "Send" inside it.

4

Add basic accessibility and structure

Wrap the form inside a <main> element. Add a heading <h1> above the form with the text "Contact Us".

HTML

  
  
    Name:
    
    Email:
    
    Send
  

Hint

Use a <main> tag to wrap the form. Add a heading <h1> with the text "Contact Us" above the form.

Practice

1. What does the action attribute in an HTML form specify?

easy

A. The type of input fields inside the form

B. The style of the form on the page

C. The method used to send the form data

D. The URL where the form data is sent after submission

Solution

1. Step 1: Understand the role of action attribute

   The action attribute tells the browser where to send the form data when the user submits the form.

2. Step 2: Differentiate from other attributes

   The method attribute controls how data is sent, not where. Styling and input types are unrelated to action.

3. Final Answer:

   The URL where the form data is sent after submission -> Option D

4. Quick Check:

   action = URL destination [OK]

Hint: Remember: action = destination URL for form data [OK]

Common Mistakes:

• Confusing action with method
• Thinking action controls form style
• Assuming action sets input types

2. Which of the following is the correct way to start a form that sends data using POST method to '/submit' URL?

easy

A.

B.

C.

D.

Solution

1. Step 1: Check attribute order and values

   Both action and method attributes are needed. The method should be 'post' and action should be '/submit'. The order of attributes does not affect correctness.

2. Step 2: Validate each option

   The <form method='post' action='submit'> has incorrect action (missing leading '/'). The <form action='/submit' method='post'> uses correct attribute names and values. The one with method='get' uses wrong method for POST. The one with method='submit' uses invalid method and action values.

3. Final Answer:

   <form action='/submit' method='post'> -> Option B

4. Quick Check:

   Correct syntax with POST method and action URL [OK]

Hint: Use for POST forms [OK]

Common Mistakes:

• Using 'submit' as method instead of 'post' or 'get'
• Mixing up method and action attribute values
• Using wrong attribute names

3. What happens when a user submits this form?

<form action='/send' method='get'>
  <input type='text' name='username' value='alice'>
  <input type='submit'>
</form>

medium

A. The form data is not sent because method is missing

B. The browser sends a POST request to '/send' with username in the body

C. The browser sends a GET request to '/send?username=alice'

D. The browser reloads the page without sending data

Solution

1. Step 1: Identify form method and action

   The form uses method='get' and action='/send', so data will be sent via URL query string to '/send'.

2. Step 2: Understand how GET sends data

   GET appends form data as key=value pairs in the URL. Here, username=alice is added to the URL.

3. Final Answer:

   The browser sends a GET request to '/send?username=alice' -> Option C

4. Quick Check:

   GET method sends data in URL [OK]

Hint: GET method sends data in URL query string [OK]

Common Mistakes:

• Thinking GET sends data in request body
• Assuming missing method means no data sent
• Confusing reload with form submission

4. Identify the error in this form code:

<form action='/submit' method='post'>
  <input type='text' name='email'>
  <input type='submit' value='Send'>
</form>

Why might this form cause accessibility issues?

medium

A. Missing <label> for the input field

B. Incorrect method attribute value

C. Submit button missing type attribute

D. Action attribute URL is invalid

Solution

1. Step 1: Check form attributes and elements

   The form uses correct action and method. The submit button has a value and defaults to type='submit'.

2. Step 2: Identify accessibility issue

   The input field lacks a <label> element, which helps screen readers and improves usability.

3. Final Answer:

   Missing <label> for the input field -> Option A

4. Quick Check:

   Labels improve accessibility [OK]

Hint: Always add <label> for inputs to help all users [OK]

Common Mistakes:

• Thinking submit button needs explicit type
• Assuming method='post' is wrong
• Believing action URL must be absolute

5. You want to create a form that sends user feedback to '/feedback' using POST. The form should have a text area labeled 'Comments' and a submit button labeled 'Send Feedback'. Which code snippet correctly implements this with accessibility and submission basics?

hard

A. \n Comments\n \n Send Feedback\n

B. \n \n \n

C. \n Comments\n \n Send Feedback\n

D. \n Comments\n \n \n

Solution

1. Step 1: Check form action and method

   The form must send data to '/feedback' using POST method. <form action='/feedback' method='post'>\n <label for='comments'>Comments</label>\n <textarea id='comments' name='comments'></textarea>\n <button type='submit'>Send Feedback</button>\n</form> and B have method='post', but B lacks label.

2. Step 2: Verify accessibility and button labeling

   <form action='/feedback' method='post'>\n <label for='comments'>Comments</label>\n <textarea id='comments' name='comments'></textarea>\n <button type='submit'>Send Feedback</button>\n</form> uses a <label> linked to the textarea with for and id, improving accessibility. The submit button is a <button> with clear text.

3. Step 3: Eliminate incorrect options

   <form action='/feedback' method='get'>\n <label>Comments</label>\n <textarea id='comments'></textarea>\n <button>Send Feedback</button>\n</form> uses GET method and missing name attribute on textarea, and label is not linked. <form action='/feedback'>\n <label for='comments'>Comments</label>\n <textarea id='comments' name='comments'></textarea>\n <input type='submit' value='Send Feedback'>\n</form> misses method attribute, so defaults to GET.

4. Final Answer:

   code snippet with proper action, method, label, and button -> Option A

5. Quick Check:

   Use POST + label + submit button for accessible form [OK]

Hint: Use label with for/id and method='post' for forms [OK]

Common Mistakes:

• Omitting method attribute defaults to GET
• Not linking label to input with for and id
• Using GET when POST is required