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【Vue.js】TodoList 編集機能を追加

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概要

前回のtodoListに加えて編集できる機能を追加した。

まずは全体像

  • html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="css/main.css">
    <title>Vue3</title>
</head>
<body>
    <div id="app">
        <h2>Todoリスト</h2>
        <form action="">
            <input type="text" v-model="newItem">
            <button @click.prevent="addItem">登録</button>
        </form>
        <hr>
        <ul>
            <li v-for="(todo, index) in todos">
                <input type="checkbox" v-model="todo.isDone">
                <span :class="{done: todo.isDone}">{{ todo.item }}</span>
                <!-- 更新 -->
                <div v-if="todo.isActive">
                    <span >
                        <input type="text" v-model="todo.item">
                    </span>
                    <button @click="updateDone(index)">完了</button>
                </div>
                <button @click="deleteItem(index)">削除</button>
                <button v-show="!todo.isActive" @click="updateItem(index)">修正</button>
                <hr>
            </li>
     
        </ul>
        <pre>{{$data}}</pre>

    </div>
    <script src="https://unpkg.com/vue@3.1.5"></script>
    <script src="js/main.js"></script>



</body>
</html>
  • js
const app = Vue.createApp({
    data(){
        return {
            newItem:'',
            todos: [],
        }
    },
    methods:{
        addItem(){
            if(this.newItem === '') return //入力欄が空だった時処理を終了
            let todo = {
                item: this.newItem,
                isDone: false,
                isActive: false
            }
            this.todos.push(todo)
            this.newItem = '' //todo登録後に入力欄を空にする
        },
        deleteItem(index){
            this.todos.splice(index, 1) //第一引数は削除する配列, 第二引数は削除する範囲

        },
        updateItem(index){
            this.todos[index].isActive = true
            this.todos[index].item = this.todos[index].item
        },
        updateDone(index){
            this.todos[index].isActive = false
        }
    }
})

app.mount('#app')
  • css
#app li > span.done {
    text-decoration: line-through;
}

#app ul{
    list-style: none;
}

追加した点

  • ボタンイベントのmethodsを二つ追加。
    • updateItem(index)
      • 修正する時のボタン
    • updateDone(index)
      • 修正が完了した時のボタン
  • dataプロパティにisActiveプロパティを追加
    • v-ifにisActiveをセット
    • 修正ボタンを押した時にtrueに変更
      • 修正可能なinput要素を表示する
      • 修正完了ボタンを表示する。
      • 修正ボタンをv-showでfalseにして非表示にする。
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