- localStorage 只能儲存字串資料，該練習資料來源是陣列和物件，會使用 JSON.stringify() 轉成 json 後才進行儲存，讀取資料則是透過 JSON.parse() 轉回
- render 時會透過自訂 attribute 來儲存識別資料
- render 資料時，並不是逐一註冊每一個 li click 事件，而是網頁 Loading 時註冊 ul click 事件，再透過 event.target.closest 來確定抓到 li 並進行刪除資料
Index.html
<!DOCTYPE html>
<html lang="zh-Hant">
<head>
<base target="_top">
<meta charset="utf-8">
<?!= include('Stylesheet'); ?>
</head>
<body>
<div class="container">
<h2 class="header-title">GAS LocalStorage 練習</h2>
<div class="input-group">
<input type="text" id="todoInput" class="todo-input" placeholder="請輸入待辦事項...">
<button type="button" id="addBtn" class="btn-submit">新增</button>
</div>
<ul id="todoList" class="todo-list">
</ul>
</div>
<script>
/**
* 從 localStorage 讀取並解析待辦事項
* @returns {Array<{id: number, text: string}>}
*/
const getTodos = () => {
const todosData = localStorage.getItem('my_todos');
return todosData ? JSON.parse(todosData) : [];
};
/**
* 將待辦事項陣列轉換為 JSON 字串並儲存至 localStorage
* @param {Array<{id: number, text: string}>} todos
*/
const saveTodos = (todos) => {
localStorage.setItem('my_todos', JSON.stringify(todos));
};
/**
* 負責將資料渲染至畫面 (讀取)
*/
const renderTodos = () => {
const todos = getTodos();
const listContainer = document.getElementById('todoList');
listContainer.innerHTML = '';
todos.forEach(todo => {
const liElement = document.createElement('li');
liElement.className = 'todo-item';
liElement.setAttribute('data-id', todo.id);
const textSpan = document.createElement('span');
textSpan.textContent = todo.text;
const hintSpan = document.createElement('span');
hintSpan.className = 'hint-text';
hintSpan.textContent = '刪除';
liElement.appendChild(textSpan);
liElement.appendChild(hintSpan);
listContainer.appendChild(liElement);
});
};
/**
* 處理新增待辦事項邏輯 (新增)
*/
const handleAddTodo = () => {
const inputElement = document.getElementById('todoInput');
const textValue = inputElement.value.trim();
if (!textValue) {
alert('請先輸入待辦事項內容！');
return;
}
const todos = getTodos();
const newTodo = {
id: Date.now(),
text: textValue
};
todos.push(newTodo);
saveTodos(todos);
inputElement.value = '';
renderTodos();
};
/**
* 處理刪除待辦事項邏輯 (刪除)
* @param {number} id
*/
const deleteTodo = (id) => {
const todos = getTodos();
const filteredTodos = todos.filter(todo => todo.id !== id);
saveTodos(filteredTodos);
renderTodos();
};
/**
* 處理待辦清單的點擊事件
* @param {Event} event
*/
const handleListClick = (event) => {
const clickedItem = event.target.closest('.todo-item');
if (clickedItem) {
const todoId = Number(clickedItem.getAttribute('data-id'));
deleteTodo(todoId);
}
};
document.addEventListener('DOMContentLoaded', () => {
const addBtn = document.getElementById('addBtn');
const todoInput = document.getElementById('todoInput');
const todoList = document.getElementById('todoList');
addBtn.addEventListener('click', handleAddTodo);
todoInput.addEventListener('keypress', (event) => {
if (event.key === 'Enter') {
handleAddTodo();
}
});
todoList.addEventListener('click', handleListClick);
renderTodos();
});
</script>
</body>
</html>
Stylesheet.html
<style>
body {
font-family: sans-serif;
background-color: #f4f7f6;
color: #333;
padding: 20px;
}
.container {
width: 500px;
margin: 0 auto;
background: #ffffff;
padding: 24px;
border-radius: 8px;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.header-title {
text-align: center;
color: #2c3e50;
margin-top: 0;
}
.input-group {
display: flex;
gap: 10px;
margin-bottom: 20px;
}
.todo-input {
flex-grow: 1;
padding: 10px;
border: 1px solid #ddd;
border-radius: 4px;
font-size: 16px;
}
.btn-submit {
padding: 10px 20px;
background-color: #3498db;
color: #ffffff;
border: none;
border-radius: 4px;
font-size: 16px;
cursor: pointer;
}
.btn-submit:hover {
background-color: #2980b9;
}
.todo-list {
list-style-type: none;
padding: 0;
margin: 0;
}
.todo-item {
background-color: #f8f9fa;
padding: 12px;
margin-bottom: 8px;
border-radius: 4px;
border-left: 4px solid #3498db;
display: flex;
justify-content: space-between;
align-items: center;
cursor: pointer;
}
.todo-item:hover {
background-color: #e9ecef;
}
.hint-text {
font-size: 12px;
color: #e74c3c;
}
</style>
Code.gs
/**
* 處理 Web App 的 GET 請求，透過模板引擎渲染前端 HTML 頁面
* @param {Object} e - GET 請求的事件物件
* @returns {GoogleAppsScript.HTML.HtmlOutput} 回傳渲染後的 HTML 視圖
*/
function doGet(e) {
// 使用 createTemplateFromFile 才能解析 HTML 檔案中的 GAS 標籤
return HtmlService.createTemplateFromFile('Index')
.evaluate()
.setTitle('待辦事項練習')
}
/**
* 將指定的 HTML 檔案內容載入到當前頁面中 (用於抽離 CSS 或 JS)
* @param {string} filename - 要載入的檔案名稱
* @returns {string} 檔案內容字串
*/
function include(filename) {
return HtmlService.createHtmlOutputFromFile(filename).getContent();
}
觀察儲存在 localStorage 上的資料
