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Todo List with Dark theme

Todo List with Dark theme

This tailwind example is contributed by Muzammil Riaz, on 28-May-2025. Component is made with Tailwind CSS v3. It is responsive. It supports dark mode. similar terms for this example is find

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Author Muzammil Riaz

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<!DOCTYPE html>
<html lang="en" class="light">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Todo App</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <script>
        tailwind.config = {
            darkMode: 'class',
            theme: {
                extend: {
                    colors: {
                        primary: {
                            light: '#4f46e5',
                            dark: '#6366f1'
                        }
                    }
                }
            }
        }
    </script>
    <style>
        [type="checkbox"]:checked + label {
            text-decoration: line-through;
            opacity: 0.7;
        }
    </style>
</head>
<body class="bg-gray-100 dark:bg-gray-900 text-gray-800 dark:text-gray-100 min-h-screen transition-colors duration-200">
    <div class="container mx-auto px-4 py-8 max-w-md">
        
        <header class="flex justify-between items-center mb-8">
            <h1 class="text-2xl font-bold text-primary-light dark:text-primary-dark">Todo App</h1>
            <button id="theme-toggle" class="p-2 rounded-full bg-gray-200 dark:bg-gray-700">
                <svg id="theme-icon-light" xmlns="http://www.w3.org/2000/svg" class="h-5 w-5" viewBox="0 0 20 20" fill="currentColor">
                    <path fill-rule="evenodd" d="M10 2a1 1 0 011 1v1a1 1 0 11-2 0V3a1 1 0 011-1zm4 8a4 4 0 11-8 0 4 4 0 018 0zm-.464 4.95l.707.707a1 1 0 001.414-1.414l-.707-.707a1 1 0 00-1.414 1.414zm2.12-10.607a1 1 0 010 1.414l-.706.707a1 1 0 11-1.414-1.414l.707-.707a1 1 0 011.414 0zM17 11a1 1 0 100-2h-1a1 1 0 100 2h1zm-7 4a1 1 0 011 1v1a1 1 0 11-2 0v-1a1 1 0 011-1zM5.05 6.464A1 1 0 106.465 5.05l-.708-.707a1 1 0 00-1.414 1.414l.707.707zm1.414 8.486l-.707.707a1 1 0 01-1.414-1.414l.707-.707a1 1 0 011.414 1.414zM4 11a1 1 0 100-2H3a1 1 0 000 2h1z" clip-rule="evenodd" />
                </svg>
                <svg id="theme-icon-dark" xmlns="http://www.w3.org/2000/svg" class="h-5 w-5 hidden" viewBox="0 0 20 20" fill="currentColor">
                    <path d="M17.293 13.293A8 8 0 016.707 2.707a8.001 8.001 0 1010.586 10.586z" />
                </svg>
            </button>
        </header>

<form id="todo-form" class="mb-6 flex gap-2">
            <input 
                type="text" 
                id="todo-input" 
                placeholder="Add a new task..." 
                class="flex-1 px-4 py-2 rounded-lg border border-gray-300 dark:border-gray-600 bg-white dark:bg-gray-800 focus:outline-none focus:ring-2 focus:ring-primary-light dark:focus:ring-primary-dark"
                required
            >
            <button 
                type="submit" 
                class="px-4 py-2 bg-primary-light dark:bg-primary-dark text-white rounded-lg hover:opacity-90 transition-opacity"
            >
                Add
            </button>
        </form>

<div id="todo-list" class="space-y-2">
            
            <div class="text-center py-4 text-gray-500 dark:text-gray-400">
                No tasks yet. Add one above!
            </div>
        </div>

<div class="mt-6 text-sm text-gray-500 dark:text-gray-400 flex justify-between">
            <span id="total-count">0 items</span>
            <button id="clear-completed" class="hover:text-primary-light dark:hover:text-primary-dark">Clear completed</button>
        </div>
    </div>

const savedTheme = localStorage.getItem('theme') || 
                            (window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light');
            
            if (savedTheme === 'dark') {
                html.classList.add('dark');
                themeIconLight.classList.add('hidden');
                themeIconDark.classList.remove('hidden');
            }

themeToggle.addEventListener('click', function() {
                html.classList.toggle('dark');
                
                if (html.classList.contains('dark')) {
                    localStorage.setItem('theme', 'dark');
                    themeIconLight.classList.add('hidden');
                    themeIconDark.classList.remove('hidden');
                } else {
                    localStorage.setItem('theme', 'light');
                    themeIconLight.classList.remove('hidden');
                    themeIconDark.classList.add('hidden');
                }
            });

// Todo App Functionality
            const todoForm = document.getElementById('todo-form');
            const todoInput = document.getElementById('todo-input');
            const todoList = document.getElementById('todo-list');
            const totalCount = document.getElementById('total-count');
            const clearCompleted = document.getElementById('clear-completed');

let todos = JSON.parse(localStorage.getItem('todos')) || [];

function renderTodos() {
                if (todos.length === 0) {
                    todoList.innerHTML = '<div class="text-center py-4 text-gray-500 dark:text-gray-400">No tasks yet. Add one above!</div>';
                    totalCount.textContent = '0 items';
                    return;
                }

todoList.innerHTML = '';
                let completedCount = 0;

todos.forEach((todo, index) => {
                    if (todo.completed) completedCount++;

const checkbox = todoItem.querySelector(`#todo-${index}`);
                    checkbox.addEventListener('change', () => {
                        todos[index].completed = checkbox.checked;
                        saveTodos();
                        renderTodos();
                    });

const deleteBtn = todoItem.querySelector('button[data-index]');
                    deleteBtn.addEventListener('click', () => {
                        todos.splice(index, 1);
                        saveTodos();
                        renderTodos();
                    });

todoList.appendChild(todoItem);
                });

totalCount.textContent = `${todos.length} ${todos.length === 1 ? 'item' : 'items'}`;
            }

function saveTodos() {
                localStorage.setItem('todos', JSON.stringify(todos));
            }

todoForm.addEventListener('submit', (e) => {
                e.preventDefault();
                const text = todoInput.value.trim();
                if (text) {
                    todos.push({ text, completed: false });
                    saveTodos();
                    renderTodos();
                    todoInput.value = '';
                }
            });

clearCompleted.addEventListener('click', () => {
                todos = todos.filter(todo => !todo.completed);
                saveTodos();
                renderTodos();
            });

renderTodos();
        });
    </script>
</body>
</html>

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