To-Do List using HTML, CSS, Javascript

Quick Preview

HTML Structure

The HTML structure defines the basic layout of the To-Do List application.

Code:


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="style.css">
    <title>TO-DO - Manish Tamang</title>
    <link href="pink_dino%20(2).png" rel="shortcut icon" type="image/x-icon" />
</head>
<body>
<section class="container">
  <div class="heading">
    <img class="heading__img" src="pink_dino%20(2).png" style="width: 30%; height: 30%;">
    <h1 class="heading__title">To-Do List</h1>
  </div>
  <form class="form">
    <div>
      <label class="form__label" for="todo">~ Today I need to ~</label>
      <input class="form__input" type="text" id="todo" name="to-do" size="30" autocomplete="off" required>
      <button class="button"><span>Submit</span></button>
    </div>
  </form>
  <div>
    <ul class="toDoList"></ul>
  </div>
</section>
<script src="script.js"></script>
</body>
</html>

Key Components

Head Section: Includes meta tags for character set and viewport settings, links to CSS stylesheet, and title.
Body Section:
Section (container): The main container for the To-Do list application.
Heading: Contains an image and a title.
Form: Includes a label, an input field for adding new tasks, and a submit button.
To-Do List: An unordered list to display the tasks.

CSS Styling

The CSS styles enhance the visual appearance of the To-Do List application.


@import url("https://fonts.googleapis.com/css?family=Gochi+Hand");
body {
  background-color: #a39bd2;
  min-height: 70vh;
  padding: 1rem;
  box-sizing: border-box;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #494a4b;
  font-family: "Gochi Hand", cursive;
  text-align: center;
  font-size: 130%;
}
@media only screen and (min-width: 500px) {
  body {
    min-height: 100vh;
  }
}
.container {
  width: 100%;
  height: auto;
  min-height: 500px;
  max-width: 500px;
  min-width: 250px;
  background: #f1f5f8;
  background-image: radial-gradient(#bfc0c1 7.2%, transparent 0);
  background-size: 25px 25px;
  border-radius: 20px;
  box-shadow: rgba(50, 50, 93, 0.25) 0px 50px 100px -20px, rgba(0, 0, 0, 0.3) 0px 30px 60px -30px;
  padding: 1rem;
  box-sizing: border-box;
}
.heading {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}
.heading__title {
  transform: rotate(2deg);
  padding: 0.2rem 1.2rem;
  border-radius: 20% 5% 20% 5%/5% 20% 25% 20%;
  background-color: rgba(255, 74, 231, 0.7);
  font-size: 1.5rem;
}
@media only screen and (min-width: 500px) {
  .heading__title {
    font-size: 2rem;
  }
}
.heading__img {
  width: 24%;
}
.form__label {
  display: block;
  margin-bottom: 0.5rem;
}
.form__input {
  box-sizing: border-box;
  background-color: transparent;
  padding: 0.7rem;
  border-bottom-right-radius: 15px 3px;
  border-bottom-left-radius: 3px 15px;
  border: solid 3px transparent;
  border-bottom: dashed 3px #ea95e0;
  font-family: "Gochi Hand", cursive;
  font-size: 1rem;
  color: rgba(63, 62, 65, 0.7);
  width: 70%;
  margin-bottom: 20px;
}
.form__input:focus {
  outline: none;
  border: solid 3px #ea95e0;
}
@media only screen and (min-width: 500px) {
  .form__input {
    width: 60%;
  }
}
.button {
  padding: 0;
  border: none;
  cursor: pointer;
  transform: rotate(4deg);
  transform-origin: center;
  font-family: "Gochi Hand", cursive;
  text-decoration: none;
  padding-bottom: 3px;
  border-radius: 5px;
  box-shadow: 0 2px 0 #494a4b;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  background-color: rgba(255, 213, 0, 0.7);
}
.button span {
  background: #f1f5f8;
  display: block;
  padding: 0.5rem 1rem;
  border-radius: 5px;
  border: 2px solid #494a4b;
}
.button:active, .button:focus {
  transform: translateY(4px);
  padding-bottom: 0px;
  outline: 0;
}
.toDoList {
  text-align: left;
}
.toDoList li {
  position: relative;
  padding: 0.5rem;
}
.toDoList li:hover {
  text-decoration: line-through wavy #24bffb;
}

Key Styles

Body: Sets the background color, font, and overall alignment.
Container: Defines the main container's size, background, border-radius, and box-shadow.
Heading: Styles for the heading image and title.
Form: Styles for the form, including input fields and buttons.
To-Do List: Styles for the list and list items.

JavaScript Functionality

The JavaScript code manages the To-Do List's dynamic behavior, including adding and removing tasks, and saving the list to local storage.


(() => {
  // state variables
  let toDoListArray = JSON.parse(localStorage.getItem('toDoList')) || [];
  // ui variables
  const form = document.querySelector(".form");
  const input = form.querySelector(".form__input");
  const ul = document.querySelector(".toDoList");
  // Load initial To-Do list items from local storage
  loadToDoList();
  // event listeners
  form.addEventListener('submit', e => {
    e.preventDefault();
    let itemId = String(Date.now());
    let toDoItem = input.value;
    addItemToDOM(itemId, toDoItem);
    addItemToArray(itemId, toDoItem);
    input.value = '';
  });
  ul.addEventListener('click', e => {
    let id = e.target.getAttribute('data-id')
    if (!id) return;
    removeItemFromDOM(id);
    removeItemFromArray(id);
  });
  // functions
  function loadToDoList() {
    toDoListArray.forEach(item => {
      addItemToDOM(item.itemId, item.toDoItem);
    });
  }
  function addItemToDOM(itemId, toDoItem) {
    const li = document.createElement('li')
    li.setAttribute("data-id", itemId);
    li.innerText = toDoItem;
    ul.appendChild(li);
  }
  function addItemToArray(itemId, toDoItem) {
    toDoListArray.push({ itemId, toDoItem });
    updateLocalStorage();
  }
  function removeItemFromDOM(id) {
    var li = document.querySelector('[data-id="' + id + '"]');
    ul.removeChild(li);
  }
  function removeItemFromArray(id) {
    toDoListArray = toDoListArray.filter(item => item.itemId !== id);
    updateLocalStorage();
  }
  function updateLocalStorage() {
    localStorage.setItem('toDoList', JSON.stringify(toDoListArray));
  }
})();

Key Functions

State Variables:

toDoListArray: Array to store to-do items, initialized from local storage.
form, input, ul: DOM elements for the form, input field, and list.

Event Listeners:

Form Submit: Prevents default form submission, creates a new to-do item, and adds it to the DOM and array.
List Click: Removes the clicked to-do item from the DOM and array.

Functions:

loadToDoList(): Loads initial items from local storage.
addItemToDOM(itemId, toDoItem): Adds a new item to the DOM.
addItemToArray(itemId, toDoItem): Adds a new item to the array and updates local storage.
removeItemFromDOM(id): Removes an item from the DOM.
removeItemFromArray(id): Removes an item from the array and updates local storage.
updateLocalStorage(): Updates local storage with the current state of the to-do list array.

Credits

This To-Do List application was meticulously crafted by someone years ago. I saved the code because, in programming, we often reuse and build upon existing work—so no worries! 😁🥳