カテゴリー: programming

React リスト項目にkey属性を設定する

index.html

<!DOCTYPE html>
<html lang="ja">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>My React App</title>
  <script src="https://unpkg.com/react@18/umd/react.development.js"></script>
  <script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
  <link rel="stylesheet" href="style.css">
</head>

<body>
  <div id="container"></div>

  <script type="text/babel">
    'use strict';

    {
      const Menu = (props) => {
        return (
          <li>
            <button>-</button>
            <button>+</button>
            {props.name}({props.price}G X 0個)
            </li>
        );
      };

      const App = () => {
        const menus = [
          {id: 0,name: '聖剣', price: 400},
          {id: 1,name: '魔装銃', price: 500},
          {id: 2,name: '魔剣', price: 300},
        ];

        const menuItems = menus.map((menu) =>{
          return(
            <Menu
            key={menu.id}
            name={menu.name}
            price={menu.price}
            />
          );
        });
        return (
          <>
            <h1>メニュー</h1>
            <ul className="menus">
              {menuItems}
            </ul>
            <p>合計: 0円</p>
          </>
        );
      };

      const container = document.querySelector('#container');
      const root = ReactDOM.createRoot(container);
      root.render(<App />);
    }
  </script>
</body>

</html>

style.css

@charset "utf-8";

body{
    margin: 0;
}

#container{
    width: 400px;
    margin: auto;
}

h1{
    margin: 16px 0 0 0;
    font-size: 20px;
    text-align: center;
}

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

.menus > li{
    border: 1px solid #ccc;
    padding: 8px;
    border-radius: 8px;
    margin-top: 16px;
}

.menus button{
    margin-right: 8px;
    width: 24px;
}
p{
    margin: 0;
    text-align: right;
}

React 配列

index.html

<!DOCTYPE html>
<html lang="ja">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>My React App</title>
  <script src="https://unpkg.com/react@18/umd/react.development.js"></script>
  <script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
  <link rel="stylesheet" href="style.css">
</head>

<body>
  <div id="container"></div>

  <script type="text/babel">
    'use strict';

    {
      const Menu = (props) => {
        return (
          <li>
            <button>-</button>
            <button>+</button>
            {props.name}({props.price}G X 0個)
            </li>
        );
      };

      const App = () => {
        const menus = [
          {name: '聖剣', price: 400},
          {name: '魔装銃', price: 500},
          {name: '魔剣', price: 300},
        ];

        const menuItems = menus.map((menu) =>{
          return(
            <Menu 
            name={menu.name}
            price={menu.price}
            />
          );
        });
        return (
          <>
            <h1>メニュー</h1>
            <ul className="menus">
              {menuItems}
            </ul>
            <p>合計: 0円</p>
          </>
        );
      };

      const container = document.querySelector('#container');
      const root = ReactDOM.createRoot(container);
      root.render(<App />);
    }
  </script>
</body>

</html>

style.css

@charset "utf-8";

body{
    margin: 0;
}

#container{
    width: 400px;
    margin: auto;
}

h1{
    margin: 16px 0 0 0;
    font-size: 20px;
    text-align: center;
}

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

.menus > li{
    border: 1px solid #ccc;
    padding: 8px;
    border-radius: 8px;
    margin-top: 16px;
}

.menus button{
    margin-right: 8px;
    width: 24px;
}
p{
    margin: 0;
    text-align: right;
}

React Appコンポーネント

index.html

<!DOCTYPE html>
<html lang="ja">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>My React App</title>
  <script src="https://unpkg.com/react@18/umd/react.development.js"></script>
  <script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
</head>
  <link rel="stylesheet" href="style.css">
<body>
  <div id="container"></div>

  <script type="text/babel">
    'use strict';

    {
      const App = () => {
        return(
          <>
            <h1>アイテム</h1>
            <ul className="menus">
              <li>ポーション</li>
              <li>エリクサー</li>
              <li>ラストエリクサー</li>
            </ul>
            <p>合計: 0G</p>
          </>
        );
      };
      const container = document.querySelector('#container');
      const root = ReactDOM.createRoot(container);
      root.render(<App/>);
    }
  </script>
</body>

</html>

style.css

@charset "utf-8";

body{
    margin: 0;
}

#container{
    width: 400px;
    margin: auto;
}

h1{
    margin: 16px 0 0 0;
    font-size: 20px;
    text-align: center;
}

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

.menus > li{
    border: 1px solid #ccc;
    padding: 8px;
    border-radius: 8px;
    margin-top: 16px;
}

p{
    margin: 0;
    text-align: right;
}

React CSSでスタイリングしていこう

index.html

<!DOCTYPE html>
<html lang="ja">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>My React App</title>
  <script src="https://unpkg.com/react@18/umd/react.development.js"></script>
  <script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
</head>
  <link rel="stylesheet" href="style.css">
<body>
  <div id="container"></div>

  <script type="text/babel">
    'use strict';

    {
      const container = document.querySelector('#container');
      const root = ReactDOM.createRoot(container);
      root.render(
        <>
           <h1>アイテム</h1>
           <ul>
            <li>ポーション</li>
            <li>エリクサー</li>
            <li>ラストエリクサー</li>
           </ul>
           <p>合計: 0G</p>
        </>
      );
    }
  </script>
</body>

</html>

style.css

@charset "utf-8";

body{
    margin: 0;
}

#container{
    width: 400px;
    margin: auto;
    background: pink;
}

h1{
    margin: 0;
    font-size: 20px;
    text-align: center;
}

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

p{
    margin: 0;
    text-align: right;
}

React JSX記法

<!DOCTYPE html>
<html lang="ja">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>My React App</title>
  <script src="https://unpkg.com/react@18/umd/react.development.js"></script>
  <script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
</head>

<body>
  <div id="container"></div>

  <script type="text/babel">
    'use strict';

    {
      const container = document.querySelector('#container');
      const root = ReactDOM.createRoot(container);
      root.render(
        <>
           <h1>アイテム</h1>
           <ul>
            <li>ポーション</li>
            <li>エリクサー</li>
            <li>ラストエリクサー</li>
           </ul>
           <p>合計: 0G</p>
        </>
      );
    }
  </script>
</body>

</html>

tailwindcss To-Do List

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>To-Do List</title>
  <link href="https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css" rel="stylesheet">
</head>
<body class="bg-gray-100 flex items-center justify-center h-screen">
  <div class="bg-white p-8 rounded-lg shadow-lg w-full max-w-md">
    <h1 class="text-2xl font-bold mb-4">To-Do List</h1>
    <form id="todo-form" class="flex mb-4">
      <input id="todo-input" type="text" placeholder="Add a new task" class="flex-grow p-2 border rounded-l-lg focus:outline-none">
      <button type="submit" class="bg-blue-500 text-white px-4 py-2 rounded-r-lg hover:bg-blue-700">Add</button>
    </form>
    <div class="mb-4">
      <button id="filter-all" class="filter-btn bg-gray-200 text-black px-4 py-2 rounded-l-lg">All</button>
      <button id="filter-active" class="filter-btn bg-gray-200 text-black px-4 py-2">Active</button>
      <button id="filter-completed" class="filter-btn bg-gray-200 text-black px-4 py-2 rounded-r-lg">Completed</button>
    </div>
    <ul id="todo-list" class="list-disc pl-5">
      <!-- To-Do items will be added here -->
    </ul>
  </div>

  <script>
    const todoForm = document.getElementById('todo-form');
    const todoInput = document.getElementById('todo-input');
    const todoList = document.getElementById('todo-list');
    const filterButtons = document.querySelectorAll('.filter-btn');

    document.addEventListener('DOMContentLoaded', loadTodos);
    todoForm.addEventListener('submit', function(event) {
      event.preventDefault();
      addTodoItem(todoInput.value);
      todoInput.value = '';
    });

    filterButtons.forEach(button => {
      button.addEventListener('click', () => {
        document.querySelectorAll('.filter-btn').forEach(btn => btn.classList.remove('bg-blue-500', 'text-white'));
        button.classList.add('bg-blue-500', 'text-white');
        filterTodos(button.id);
      });
    });

    function addTodoItem(task) {
      if (task === '') return;

      const listItem = document.createElement('li');
      listItem.classList.add('flex', 'items-center', 'justify-between', 'py-2', 'border-b', 'border-gray-200');

      const taskText = document.createElement('span');
      taskText.textContent = task;
      taskText.classList.add('flex-grow', 'cursor-pointer');
      taskText.addEventListener('click', toggleComplete);

      const editButton = document.createElement('button');
      editButton.textContent = 'Edit';
      editButton.classList.add('bg-yellow-500', 'text-white', 'px-2', 'py-1', 'rounded', 'ml-2', 'hover:bg-yellow-700');
      editButton.addEventListener('click', () => editTodoItem(listItem, taskText));

      const priorityButton = document.createElement('button');
      priorityButton.textContent = 'Important';
      priorityButton.classList.add('bg-green-500', 'text-white', 'px-2', 'py-1', 'rounded', 'ml-2', 'hover:bg-green-700');
      priorityButton.addEventListener('click', () => togglePriority(taskText));

      const deleteButton = document.createElement('button');
      deleteButton.textContent = 'Delete';
      deleteButton.classList.add('bg-red-500', 'text-white', 'px-2', 'py-1', 'rounded', 'ml-2', 'hover:bg-red-700');
      deleteButton.addEventListener('click', () => deleteTodoItem(listItem));

      listItem.appendChild(taskText);
      listItem.appendChild(editButton);
      listItem.appendChild(priorityButton);
      listItem.appendChild(deleteButton);
      todoList.appendChild(listItem);

      saveTodos();
    }

    function toggleComplete(event) {
      event.target.classList.toggle('line-through');
      event.target.classList.toggle('text-gray-500');
      saveTodos();
    }

    function togglePriority(taskText) {
      taskText.classList.toggle('font-bold');
      saveTodos();
    }

    function editTodoItem(listItem, taskText) {
      const newTask = prompt('Edit your task:', taskText.textContent);
      if (newTask !== null && newTask !== '') {
        taskText.textContent = newTask;
        saveTodos();
      }
    }

    function deleteTodoItem(listItem) {
      listItem.remove();
      saveTodos();
    }

    function saveTodos() {
      const todos = [];
      document.querySelectorAll('#todo-list li').forEach((item) => {
        todos.push({
          text: item.querySelector('span').textContent,
          completed: item.querySelector('span').classList.contains('line-through'),
          important: item.querySelector('span').classList.contains('font-bold')
        });
      });
      localStorage.setItem('todos', JSON.stringify(todos));
    }

    function loadTodos() {
      const savedTodos = JSON.parse(localStorage.getItem('todos')) || [];
      savedTodos.forEach((todo) => {
        const listItem = document.createElement('li');
        listItem.classList.add('flex', 'items-center', 'justify-between', 'py-2', 'border-b', 'border-gray-200');

        const taskText = document.createElement('span');
        taskText.textContent = todo.text;
        taskText.classList.add('flex-grow', 'cursor-pointer');
        if (todo.completed) {
          taskText.classList.add('line-through', 'text-gray-500');
        }
        if (todo.important) {
          taskText.classList.add('font-bold');
        }
        taskText.addEventListener('click', toggleComplete);

        const editButton = document.createElement('button');
        editButton.textContent = 'Edit';
        editButton.classList.add('bg-yellow-500', 'text-white', 'px-2', 'py-1', 'rounded', 'ml-2', 'hover:bg-yellow-700');
        editButton.addEventListener('click', () => editTodoItem(listItem, taskText));

        const priorityButton = document.createElement('button');
        priorityButton.textContent = 'Important';
        priorityButton.classList.add('bg-green-500', 'text-white', 'px-2', 'py-1', 'rounded', 'ml-2', 'hover:bg-green-700');
        priorityButton.addEventListener('click', () => togglePriority(taskText));

        const deleteButton = document.createElement('button');
        deleteButton.textContent = 'Delete';
        deleteButton.classList.add('bg-red-500', 'text-white', 'px-2', 'py-1', 'rounded', 'ml-2', 'hover:bg-red-700');
        deleteButton.addEventListener('click', () => deleteTodoItem(listItem));

        listItem.appendChild(taskText);
        listItem.appendChild(editButton);
        listItem.appendChild(priorityButton);
        listItem.appendChild(deleteButton);
        todoList.appendChild(listItem);
      });
    }

    function filterTodos(filter) {
      const allTodos = document.querySelectorAll('#todo-list li');
      allTodos.forEach((todo) => {
        switch (filter) {
          case 'filter-all':
            todo.style.display = 'flex';
            break;
          case 'filter-active':
            todo.querySelector('span').classList.contains('line-through') ? todo.style.display = 'none' : todo.style.display = 'flex';
            break;
          case 'filter-completed':
            todo.querySelector('span').classList.contains('line-through') ? todo.style.display = 'flex' : todo.style.display = 'none';
            break;
        }
      });
    }
  </script>
</body>
</html>

Tailwind CSS入門　インタラクティブにスタイルを変えてみよう

index.html

<!DOCTYPE html>
<html lang="ja">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>My Tailwind CSS</title>
    <script src="https://cdn.tailwindcss.com"></script>
</head>

<body>
    <button
        class="bg-orange-400 text-white m-4 py-2 px-4 rounded-full shadow-black/30 shadow-md hover:opacity-80 transition duration-500 active:translate-y-1">
        Buy now!
    </button>
</body>

</html>

Tailwind CSS入門 ボタンのスタイリングをしてみよう

<!DOCTYPE html>
<html lang="ja">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>My Tailwind CSS</title>
    <script src="https://cdn.tailwindcss.com"></script>
</head>

<body>
<button class="bg-orange-400 text-white m-4 py-2 px-4 rounded-full shadow-black/30 shadow-md">
        Buy now!
    </button>
</body>

</html>

Tailwind CSS入門 境界線を設定してみよう

<!DOCTYPE html>
<html lang="ja">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>My Tailwind CSS</title>
    <script src="https://cdn.tailwindcss.com"></script>
</head>

<body>
    <div class="bg-red-400 w-20 h-20 border-solid border-gray-200 border-8">Box 1</div>
    <div class="bg-sky-400 w-20 h-20 border-dashed border-gray-200 border-b-8">Box 2</div>
</body>

</html>