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< Back to Overview

Lesson 4.3: HTML Forms and DOM Practice

This assignment will teach you the following:

  • HTML Forms
  • DOM element selection
  • DOM traversal
  • DOM manipulation
  • Event handling

Instructions

Getting Started:

Merge your pull request from the previous lesson (if you haven't already):

View tutorial

Fetch the updated instructions from the base repository:

Note: you may receive a conflict if you've made changes to the README or other instructions

Fetch Upstream: Step 1

Checkout your main branch and pull changes:

git checkout main
git pull

Create a new local branch to work on separate from the main branch:

git checkout -b lesson-4-3

Now, open the project directory in your code editor and continue to the next section.

Task List:

Create Message Form

  • Open your index.html file
  • Above the <footer> element, add an empty <section> element
  • Inside the new <section> element, create a level-two heading that says "Leave a Message"
  • After the heading, create an HTML <form> element with a name attribute that equals "leave_message"
  • Inside the <form> element, add the following:
    1. <input> element with attributes: type "text", name "name", and required true
    2. <input> element with attributes: type "email", name "email", and required true
    3. <textarea> element with attributes: name "message" and required true
    4. <button> element that says "Submit" and has type attribute equal to "submit"
    5. Each form field should also have a corresponding <label> element
    6. (Optional) Use <br> elements to stack the form fields
  • Save and refresh your browser

Add Message List Section

  • After the <section> element from the previous step, create a new <section> element with an id of "messages"
  • Inside that element, create a level-two heading that says "Messages"
  • After the heading, add an empty unordered list (<ul>) element
  • Save and refresh your browser

Handle Message Form Submit

  • Open your index.js file and start at the bottom
  • Using "DOM Selection", select the "leave_message" form by name attribute and store it in a variable named messageForm
  • Add an event listener to the messageForm element that handles the "submit" event
    • hint: addEventListener method
  • Inside the callback function for your event listener, create a new variable for each of the three form fields and retrieve the value from the event
    • hint: event.target is the form, event.target.name is the first input element
  • Inside the callback function for your event listener, add a console.log statement to log the three variables you created in the previous step
  • Save and refresh your browser
  • Fill out the HTML form in your browser and hit "Submit"

Note: at this point, you should notice that the browser is refreshing automatically when you submit your form which is not the desired behavior

  • Inside the callback function, above the other code you just wrote, add a new line to prevent the default refreshing behavior of the "submit" event
    • hint: preventDefault method
  • Save and refresh your browser
  • Fill out the HTML form in your browser and hit "Submit"
    • You should see that the page does not refresh and your values are logged in the console

Note: at this point, you should notice that the form is submitting properly but the form fields are not reset after submit

  • Inside the callback function, on the very last line, add a new line of code to clear the form
    • hint: reset method
  • Save and refresh your browser

Display Messages in List

  • Open index.js and start inside the event listener callback function on the line above where you reset the form
  • Using "DOM Selection", select the #messages section by id and store it in a variable named messageSection
  • Using "DOM Selection", query the messageSection (instead of the entire document) to find the <ul> element and store it in a variable named messageList
  • Create a new list item (li) element and store it in a variable named newMessage
  • On the next line, set the inner HTML of your newMessage element with the following information:
    • <a> element that displays the "name" and links to the "email" (hint: use the mailto: prefix)
    • <span> element that displays the "message"
  • Create a new <button> element and store it in a variable named removeButton
    • Set the inner text to "remove"
    • Set the type attribute to "button"
    • Add an event listener to the removeButton element that handles the "click" event
      • Inside the callback function, find the button's parent element using DOM Traversal (hint: parentNode property) and store it in a variable named entry
      • Remove the entry element from the DOM (hint: remove method)
  • Append the removeButton to the newMessage element
    • hint: appendChild method
  • Append the newMessage to the messageList element
  • Save and refresh your browser

Final Result

Final Result for Lesson 4.3

Stretch Goals

These tasks are entirely optional, but if you'd like a challenge then do your best to complete each item.

  • (Optional) Hide the #messages section when the list is empty
  • (Optional) Create an "edit" button for each message entry that allows the user to input a new/modified message

Final Step:

Check the status of your local repository to double-check the changes you made:

git status

Stage the file(s) that you edited:

git add .

Check the status again and notice that the changes from before are now staged:

git status

Create a commit for the changes you made and add a message describing the changes you made:

Note: Replace <message> with your message

git commit -m "<message>"

Push your commit to the remote repository (visible in GitHub):

git push

Check the log to make sure your commit has been published:

git log --oneline

Create a pull request and submit:

View instructions

Created by Code the Dream