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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

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

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width,initial-scale=1">
  <link rel="stylesheet" href="./css/milligram.css">
  <link rel="stylesheet" href="./css/style.css">
  <title>Vue ToDo</title>
</head>

<body>
  <div id="app" class="container">

    <h1>{{ appName }}</h1>

    <input type="text" placeholder="add ToDo..." v-model="newTodoTitle" @keyup.enter="addTodo(newTodoTitle)">

    <!-- ★todo in todosからfitleredTodosに修正 -->
    <div v-for="todo in filteredTodos">
      <label :class="{done: todo.isDone}"><input type="checkbox" v-model="todo.isDone"> {{ todo.title }}</label>
    </div>

    <!-- ★2. 各リンクをクリックでfilterStatusの値を変える -->
    <a href="#" @click="filterStatus='ALL'">All</a> |
    <a href="#" @click="filterStatus='WORKING'">Working</a> |
    <a href="#" @click="filterStatus='COMPLETED'">Completed</a>

    <button @click="deleteTodos">完了済みを削除</button>

  </div>

  <script src="./lib/vue.js"></script>
  <script src="./js/app.js"></script>
</body>

</html>
            
          
!

CSS

            
              /* milligram.cssはHTMLコード内で読み込ませています */

.done {
  text-decoration: line-through;
  color: darkgrey;
}
            
          
!

JS

            
              const app = new Vue({
  el: '#app',
  data: {
    appName: 'My Vue ToDo',
    todos: [
      {
        id: Date.now(),
        title: '',
        isDone: false
      }
    ],
    newTodoTitle: '',
    filterStatus: '' // ★1 ステータス管理用の変数を用意する
  },
  computed: {
    // ★ filterStatusに基づいた配列を返す
    filteredTodos: function() {
      switch (this.filterStatus) {
        case 'WORKING':
          return this.todos.filter((todo) => {return todo.isDone === false})
        case 'COMPLETED':
          return this.todos.filter((todo) => {return todo.isDone === true})
        default:
          return this.todos
      }
    }
  },
  methods: {
    addTodo: function (title) {

      const newTodo = {
        id: Date.now(),
        title: title,
        isDone: false
      }

      this.todos.push(newTodo);
      this.newTodoTitle = '';
      this.saveTodoToStorage();
    },
    deleteTodos: function () {

      const deletedTodos = this.todos.filter(function (todo) {
        if (todo.isDone === false) return true;
      });

      this.todos = deletedTodos;
      this.saveTodoToStorage();
    },
    saveTodoToStorage: function () {
      localStorage.setItem('todos', JSON.stringify(this.todos));
      console.log('saved!');
    },
    readTodoFromStorage: function () {
      this.todos = JSON.parse(localStorage.getItem('todos'));
      if (!this.todos) { this.todos = [] }
    }
  },
  mounted: function () {
    this.readTodoFromStorage();
  }
})

            
          
!
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