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HTML

              
                <main class="main">
    <h1>Javascriptで作るTODOリストのサンプル</h1>

    <div class="todo-list">
        <div class="add-item-area">
            <input type="text" class="add-item"><button class="add-button" aria-placeholder="入力してください">追加する</button>
        </div>
        <div class="item-area-incomplete">
            <p class="ttl">TOTOリスト</p>
            <ul>
            </ul>
        </div>
        <div class="item-area-complete">
            <p class="ttl">完了</p>
            <ul>
            </ul>
        </div>
    </div>

</main>
              
            
!

CSS

              
                input {
    border: none;
    border-radius: 8px;
    padding: 5px 10px;
    outline: none;
}

button {
    border-radius: 8px;
    border: none;
    padding: 5px 10px;
    margin-left: 10px;
    background: #ff6565;
    color: #fff;
    cursor: pointer;
}

button.incomplete-button {
    background-color: #858585;
}

li {
    display: flex;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px dotted #ccc;
}

li p {
    margin: 0;
    flex: 0 1 820px;
}

.add-item-area {
    background: #e7e7e7;
    padding: 10px;
    margin: 20px 0;
    border-radius: 10px;
}

.item-area-incomplete {
    background: #edffe5;
    padding: 10px;
    margin: 20px 0;
    border-radius: 10px 10px 0 0;
    min-height: 200px;
}

.item-area-incomplete .ttl {
    color: #fff;
    font-weight: bold;
    border-radius: 10px 10px 0 0;
    margin: -10px;
    background: #04945d;
    padding: 10px;
}

.item-area-incomplete button {
    flex: 1 0 60px;
}

.item-area-complete {
    background: #fff3e3;
    padding: 10px;
    margin: 20px 0;
    border-radius: 10px 10px 0 0;
    min-height: 200px;
}

.item-area-complete .ttl {
    color: #fff;
    font-weight: bold;
    border-radius: 10px 10px 0 0;
    margin: -10px;
    background: #c79b49;
    padding: 10px;
}

.item-area-complete button {
    flex: 1 0 60px;
}
              
            
!

JS

              
                // クラス
class TodoList {
    // コンストラクタ
    constructor() {
            this.DOM = {};
            this.DOM.incomplete = document.querySelector(".item-area-incomplete ul");
            this.DOM.complete = document.querySelector(".item-area-complete ul");

        }
        // リストを生成
    _createItem(text) {
            const liElm = document.createElement('li');
            const pElm = document.createElement('p');
            const deleteButton = document.createElement('button');
            const completeButton = document.createElement('button');

            completeButton.classList.add('complete-button');
            completeButton.innerText = '完了';
            deleteButton.classList.add('incomplete-button');
            deleteButton.innerText = '削除';
            pElm.innerText = text;

            // 完了ボタンクリック
            completeButton.addEventListener('click', (e) => {
                this.deleteItem(e.srcElement.parentNode, this.DOM.incomplete);
                this.addCompleteItem(text);
            });
            // 削除ボタンクリック
            deleteButton.addEventListener('click', (e) => {
                const confirmation = confirm("タスクを削除しても良いですか?");

                if (confirmation) {
                    this.deleteItem(e.srcElement.parentNode, this.DOM.incomplete);
                }
            });

            // 生成した要素
            liElm.appendChild(pElm);
            liElm.appendChild(completeButton);
            liElm.appendChild(deleteButton);

            return liElm;
        }
        // 完了に追加
    _completeItem(text) {
            const liElm = document.createElement('li');
            const pElm = document.createElement('p');
            const backButton = document.createElement('button');

            backButton.classList.add('complete-button');
            backButton.innerText = '戻る';
            pElm.innerText = text;
            // 戻るボタンクリック
            backButton.addEventListener('click', (e) => {
                this.deleteItem(e.srcElement.parentNode, this.DOM.complete);
                this.addItem(text);
            });

            liElm.appendChild(pElm);
            liElm.appendChild(backButton);

            return liElm;
        }
        // リストを追加
    addItem(text) {
            this.DOM.incomplete.appendChild(this._createItem(text));
        }
        // 完了に追加
    addCompleteItem(text) {
            this.DOM.complete.appendChild(this._completeItem(text));
        }
        // リストを削除
    deleteItem(target, domparent) {
        domparent.removeChild(target);
    }
}

function addtodoEvent() {
    const addItemTxt = document.querySelector(".add-item").value;
    // 値を入力していない時は処理を終了
    if (addItemTxt == "") {
        alert("値を入力してください");
        return
    }
    // フォームの値をリセット
    document.querySelector(".add-item").value = "";
    // インスタンス化
    const totoList = new TodoList();
    totoList.addItem(addItemTxt);
}

// クリックイベント
document.querySelector(".add-button").addEventListener('click', () => {
    addtodoEvent();
});

// キーボードイベント
document.addEventListener('keypress', keypress);
const regexEnter = new RegExp('(=|Enter)');

function keypress(e) {
    // エンターが押されたら
    if (regexEnter.test(e.key)) {
        addtodoEvent();
    } else {
        return false;
    }
}
              
            
!
999px

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