Frontend Mentor Todo App with Dark/Light Theme Switcher

Frontend Mentor Todo App with Dark/Light Theme Switcher

Build a TodoList Theme Switcher

Idukpaye alex's photo
Idukpaye alex
·

5 min read

Getting started with The HTML

Make sure to study it carefully

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- displays site properly based on user's device -->

  <link rel="icon" type="image/png" sizes="32x32" href="./images/favicon-32x32.png">
  <link rel="stylesheet" href="./styles.css">

  <title> Todo app</title>
</head>
<body class="theme-dark">
  <header class="flex-row">
    <h1>TODO</h1>
    <div class="theme-block">
      <input type="checkbox" name="theme" id="theme">
      <label for="theme"></label>
    </div>
  </header>

  <main>
    <div class="add-new-item flex-row">
      <span></span>
      <input type="text" placeholder="Create a new todo..." name="addItem" id="addItem">
    </div>
    <section class="content">
      <ul>
        <li class="flex-row">
          <label class="list-item">
            <input type="checkbox" name="todoItem" checked>
            <span class="checkmark"></span>
            <span class="text">Tex 1</span>
          </label>
          <span class="remove"></span>
        </li>
        <li class="flex-row">
          <label class="list-item">
            <input type="checkbox" name="todoItem">
            <span class="checkmark"></span>
            <span class="text">Text 2</span>
          </label>
          <span class="remove"></span>
        </li>
        <li class="flex-row">
          <label class="list-item">
            <input type="checkbox" name="todoItem">
            <span class="checkmark"></span>
            <span class="text">Text 2</span>
          </label>
          <span class="remove"></span>
        </li>
        <li class="flex-row">
          <label class="list-item">
            <input type="checkbox" name="todoItem">
            <span class="checkmark"></span>
            <span class="text">Text 2</span>
          </label>
          <span class="remove"></span>
        </li>
        <li class="flex-row">
          <label class="list-item">
            <input type="checkbox" name="todoItem">
            <span class="checkmark"></span>
            <span class="text">Text 2</span>
          </label>
          <span class="remove"></span>
        </li>
        <li class="flex-row">
          <label class="list-item">
            <input type="checkbox" name="todoItem">
            <span class="checkmark"></span>
            <span class="text">Text 3</span>
          </label>
          <span class="remove"></span>
        </li>
      </ul>
    </section>
    <div class="bottom-items flex-row">
      <div class="items-left"><span>2</span> items left</div>
      <div class="filter flex-row">
        <label>
          <input type="radio" name="filter" id="all" checked>
          <span>All</span>
        </label>
        <label>
          <input type="radio" name="filter" id="active">
          <span>Active</span>
        </label>
        <label>
          <input type="radio" name="filter" id="completed">
          <span>Completed</span>
        </label>
      </div>
      <span class="clear">Clear Completed</span>
    </div>
  </main>
  <script src="./script.js"></script>
</body>
</html>

The CSS Code

@import url("https://fonts.googleapis.com/css2?family=Josefin+Sans:wght@300;400;700&display=swap");

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
}

* {
  box-sizing: border-box;
}

img {
  max-width: 100%;
}

.flex-row {
  display: flex;
  flex-flow: row nowrap;
  align-items: center;
}

.theme-dark {
  --bg-top-image: 0 0 url(./images/bg-desktop-dark.jpg) no-repeat;
  --main-bg: hsl(235, 21%, 11%);
  --todo-bg: hsl(235, 24%, 19%);
  --todo-shadow: hsl(235, 21%, 11%);
  --font-color: hsl(234, 39%, 85%);
  --font-color-hover: #fff;
}

.theme-light {
  --bg-top-image: 0 0 url(./images/bg-desktop-light.jpg) no-repeat;
  --main-bg: hsl(0, 0%, 98%);
  --todo-bg: hsl(0, 0%, 98%);
  --todo-shadow: hsl(235, 19%, 35%);
  --font-color: hsl(236, 9%, 61%);
  --font-color-hover: hsl(235, 21%, 11%);
}

body {
  font: 400 18px/1 "Josefin Sans", sans-serf;
  background: var(--bg-top-image);
  background-color: var(--main-bg);
  background-size: contain;
  color: var(--font-color);
}

header,
main {
  max-width: 545px;
  margin: 0 auto;
}

header {
  justify-content: space-between;
  padding: 52px 0 11px;
}

h1 {
  font-weight: 700;
  font-size: 2.5rem;
  color: #fff;
  letter-spacing: 1rem;
}

.theme-block {
  margin: -10px 0 0;
}

.theme-block #theme {
  display: none;
}

.theme-block #theme + label::before {
  content: "";
  background: url(./images/icon-sun.svg);
  display: block;
  width: 26px;
  height: 26px;
  cursor: pointer;
}

.theme-block #theme:checked + label::before {
  background: url(./images/icon-moon.svg);
}

.add-new-item {
  background: var(--todo-bg);
  height: 65px;
  border-radius: 5px;
  margin: 0 0 24px;
  padding: 0 26px;
  position: relative;
}

.add-new-item #addItem {
  background: transparent;
  color: var(--font-color);
  border: 0;
  outline: 0;
  width: 100%;
  height: 50px;
  font: 400 18px/1 "Josefin Sans", sans-serf;
  margin: 4px 0 0 47px;
  letter-spacing: -0.3px;
}

.add-new-item span {
  width: 25px;
  height: 25px;
  border: 1px solid var(--font-color);
  display: block;
  border-radius: 50%;
  position: absolute;
  left: 26px;
  top: 21px;
  cursor: pointer;
}

.add-new-item span:hover {
  background: center url(./images/icon-check.svg) no-repeat,
    linear-gradient(135deg, hsl(192, 100%, 67%), hsl(280, 87%, 65%));
}

.content {
  background: var(--todo-bg);
  border-radius: 5px;
  box-shadow: 0 42px 30px -9px var(--todo-shadow);
}

ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

ul li {
  padding: 0 10px 0 25px;
  min-height: 65px;
  border-bottom: 1px solid var(--font-color);
  position: relative;
}

ul li input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  width: 0;
  height: 0;
}

ul li label {
  position: relative;
  cursor: pointer;
  padding: 2px 0 0 48px;
  font-size: 1.1rem;
}

.checkmark {
  position: absolute;
  top: -5px;
  left: 0;
  height: 25px;
  width: 25px;
}

ul li.hidden {
  display: none;
}

ul li input[type="checkbox"] ~ .checkmark {
  border: 1px solid var(--font-color);
  border-radius: 50px;
}

ul li input[type="checkbox"] ~ .checkmark:hover {
  border: 0;
  padding: 1px;
  background: linear-gradient(135deg, hsl(192, 100%, 67%), hsl(280, 87%, 65%));
}

ul li input[type="checkbox"] ~ .checkmark:hover::before {
  content: "";
  width: 23px;
  height: 23px;
  border-radius: 50%;
  background: var(--todo-bg);
  display: block;
}

ul li input[type="checkbox"]:checked ~ .checkmark {
  background: center url(./images/icon-check.svg) no-repeat,
    linear-gradient(135deg, hsl(192, 100%, 67%), hsl(280, 87%, 65%));
}

ul li input[type="checkbox"]:checked ~ .text {
  text-decoration: line-through;
}

.remove {
  background: url(./images/icon-cross.svg) no-repeat;
  width: 18px;
  height: 18px;
  display: none;
  cursor: pointer;
  position: absolute;
  right: 25px;
  top: 25px;
}

ul li:hover .remove {
  display: block;
}

.items-left {
  margin-right: 86px;
}

.bottom-items {
  padding: 20px 20px 20px 27px;
  font-size: 0.8rem;
  letter-spacing: 0.5px;
  align-items: baseline;
  border-radius: 5px;
  background: var(--todo-bg);
}

.filter {
  margin-right: 47px;
}

.filter input[type="radio"] {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

.filter label {
  cursor: pointer;
  padding: 0 10px;
}

.filter label:hover {
  color: var(--font-color-hover);
}

.filter input[type="radio"]:checked ~ span {
  color: hsl(221, 62%, 52%);
}

.clear {
  color: var(--font-color);
  cursor: pointer;
}

.clear:hover {
  color: var(--font-color-hover);
}

The Javascript Code

const theme = document.getElementById('theme');
const newItemInput = document.getElementById('addItem');
const todoList = document.querySelector('.content ul');
const itemsLeft = document.querySelector('.items-left span');

itemsLeft.innerText = document.querySelectorAll('.list-item input[type="checkbox"]').length;

theme.addEventListener('click', () => {
    document.querySelector('body').classList = [theme.checked ? 'theme-light' : 'theme-dark'];
});

document.querySelector('.add-new-item span').addEventListener('click', () => {
    if (newItemInput.value.length > 0) {
        createNewTodoItem(newItemInput.value);
        newItemInput.value = '';
    }
});

newItemInput.addEventListener('keypress', (e) => {
    if (e.charCode === 13 && newItemInput.value.length > 0) {
        createNewTodoItem(newItemInput.value);
        newItemInput.value = '';
    }
});

function createNewTodoItem(text) {
    const elem = document.createElement('li');
    elem.classList.add('flex-row');

    elem.innerHTML = `
        <label class="list-item">
        <input type="checkbox" name="todoItem">
        <span class="checkmark"></span>
        <span class="text">${text}</span>
    </label>
    <span class="remove"></span>
    `;

    if (document.querySelector('.filter input[type="radio"]:checked').id === 'completed') {
        elem.classList.add('hidden');
    }
    todoList.append(elem);
    updateItemsCount(1);
}

function updateItemsCount(number) {
    itemsLeft.innerText = +itemsLeft.innerText + number;
}

// remove todo item

function removeTodoItem(elem) {
    elem.remove();
    updateItemsCount(-1);
}

todoList.addEventListener('click',(event) => {
    if (event.target.classList.contains('remove')) {
        removeTodoItem(event.target.parentElement);
    }
});

// clear comleted items

document.querySelector('.clear').addEventListener('click', () => {
    document.querySelectorAll('.list-item input[type="checkbox"]:checked').forEach(item => {
        removeTodoItem(item.closest('li'));
    });
});


// filter todo list items
document.querySelectorAll('.filter input').forEach(radio => {
    radio.addEventListener('change', (e) => {
        filterTodoItems(e.target.id);
    });
});

function filterTodoItems(id) {
    const allItems = todoList.querySelectorAll('li');

    switch(id) {
        case 'all':
            allItems.forEach(item => {
                item.classList.remove('hidden');
            })
            break;
        case 'active':
            allItems.forEach(item => {
                item.querySelector('input').checked ? item.classList.add('hidden') : item.classList.remove('hidden');;
            })
            break;
        default: 
            allItems.forEach(item => {
                !item.querySelector('input').checked ? item.classList.add('hidden') : item.classList.remove('hidden');;
            })
            break;
    }
}

// Thanks for watching till the end! You are a legend!
HTML5CSSjsBeginner DevelopersWeb Development