HTML Academy
The “submit” event
Working with DOM10/23
Back to the list of tasks
  • 1. What are you planning to do?
  • 2. The “change” event
  • 3. How the “change” event works
  • 4. Deleting the element from the list
  • 5. How to check the collection length
  • 6. Debugging the code
  • 7. Static and live collections
  • 8. Displaying the message on the page
  • 9. The “submit” event
  • 10. Cancelling the form submission
  • 11. How to obtain text from the input field
  • 12. Templates and the <template> tag
  • 13. The contents of the <template> tag, document-fragment
  • 14. Cloning and inserting elements, part 1
  • 15. Cloning and inserting elements, part 2
  • 16. Cloning and inserting elements, part 3
  • 17. Cloning and inserting elements, part 4
  • 18. How to clone elements
  • 19. Adding a new element to a list
  • 20. Deleting a new task in the list
  • 21. Clearing the input field
  • 22. Summary of “Actions with DOM”
  • 23. The third program: “Instant messenger”
How to obtain text from the input field
  • Sign up
  • Log in

Loading…
Everything will be ready in few seconds

  • Theory
  • Theory
  • Comments

Cancelling the form submission

The event was triggered, the message was output, and the form was sent. It’s just that we do not need to submit the form data. Our task is to display the data from the form on the same page.

We have already discussed default actions in this assignment. Back then we were working with links, but this time we are dealing with forms. The form submission is the default form action that we need to cancel. We will use evt.preventDefault() to do this.

Cancel the default action, try to submit the form again, and check that the data is no longer being sent.

Comments

  • index.html
  • style.css
  • script.js
HTML
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>The To-Do List</title> <link href="style.css" rel="stylesheet"> </head> <body> <h1 class="visually-hidden">The To-Do List</h1> <ul class="todo-list"> </ul> <p class="empty-tasks">All of the tasks have been completed. There are no new tasks.</p> <form class="add-form" action="https://echo.htmlacademy.ru/courses" method="post"> <input class="add-form-input" type="text" aria-label="Task description" placeholder="For example, buy an elephant" required> <button class="add-form-button" type="submit">Add new task</button> </form> <template id="task-template"> <li class="todo-list-item"> <label> <input type="checkbox" class="todo-list-input"> <span></span> </label> </li> </template> <script src="script.js"></script> </body> </html>
CSS
@font-face { font-weight: 400; font-family: "Muller"; font-style: normal; font-display: swap; src: url("fonts/Muller.woff") format("woff"); } body { margin: 40px 32px; font-size: 18px; line-height: normal; font-family: "Muller", sans-serif; } .visually-hidden, .todo-list-input { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; white-space: nowrap; border: 0; clip: rect(0 0 0 0); clip-path: inset(100%); } .hidden { display: none; } .todo-list { margin: 0; padding: 0; list-style: none; } .todo-list-item { margin-bottom: 12px; } .todo-list-item label { display: block; padding: 12px 18px; background-color: #ffffff; border-radius: 4px; box-shadow: 0 2px 5px rgba(0, 0, 0, 0.15); cursor: pointer; user-select: none; } .todo-list-item span { display: flex; align-items: center; } .todo-list-input + span::before { content: ""; display: inline-block; width: 16px; height: 16px; margin-right: 16px; background-color: #ffffff; border: 2px solid #69b253; border-radius: 4px; } .todo-list-input:checked + span::before { background-color: #69b253; background-image: url("check-white.svg"); background-repeat: no-repeat; background-position: center; } .todo-list-input:not(:checked):hover + span::before, .todo-list-input:not(:checked):focus + span::before { background-color: rgba(105, 178, 83, 0.2); } .empty-tasks { color: #69b253; } .empty-tasks::before { content: ""; width: 14px; height: 13px; margin-right: 13px; background-image: url("check-green.svg"); background-repeat: no-repeat; background-position: center; } .add-form { display: flex; } .add-form-input { flex-grow: 1; box-sizing: border-box; height: 46px; margin-right: 16px; padding: 12px; font: inherit; border: 1px solid #a1b5c4; border-radius: 4px; } .add-form-input:focus { border: 1px solid #69b253; outline: none; } .add-form-input:hover { box-shadow: 0 0 6px rgba(105, 178, 83, 0.6); } .add-form-input::placeholder { color: #a1b5c4; } .add-form-button { flex-shrink: 0; padding: 12px; font: inherit; color: #ffffff; background-color: #69b253; border: none; border-radius: 4px; user-select: none; touch-action: manipulation; } .add-form-button:hover, .add-form-button:focus { background-color: #5aa045; outline: none; } .add-form-button:active { background-color: #42862e; }
JavaScript
var list = document.querySelector('.todo-list'); var items = list.children; var emptyListMessage = document.querySelector('.empty-tasks'); var newItemForm = document.querySelector('.add-form'); var toggleEmptyListMessage = function () { if (items.length === 0) { emptyListMessage.classList.remove('hidden'); } }; var addCheckHandler = function (item) { var checkbox = item.querySelector('.todo-list-input'); checkbox.addEventListener('change', function () { item.remove(); toggleEmptyListMessage(); }); }; for (var i = 0; i < items.length; i++) { addCheckHandler(items[i]); } newItemForm.addEventListener('submit', function () { // Cancel the default action here console.log('Form submitted'); });

What didn’t you like in this task?

Thanks! We’ll fix everything at once!

Click inside the mini browser to put the focus in this window.

100%
Console
Goalscompleted
0
    1. Add the evt parameter to the form submission handler function.
    2. Inside the handler, at the very beginning, add code that cancels the default action.
    3. Change the string inside console.log to 'Form was not submitted'.
    4. Add the text Ponder the meaning of life to the input field, and submit the form by clicking the “Add new task” button.

    Cookies ∙ Privacy ∙ License Agreement ∙ About ∙ Contacts ∙ © HTML Academy OÜ, 2019−2025

    VISAMastercard

    Log in

    or

    Forgot your password?

    Sign up

    Sign up

    or
    Log in

    Restore access

    Have you forgotten your password or lost access to your profile? Enter your email connected to your profile and we will send you a link to restore access.

    Forgot to connect your email to the profile? Email us and we’ll help.