課後作業-JavaScript 系列六:第6課 ── 認識 data model 的優點

06_js_datamodel-export.html
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| <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>JavaScript 系列六:第6課 ── 認識 data model 的優點</title> <link rel="stylesheet" href="./06_js_datamodel-export.css"> </head> <body> <input type="text"> <button id="add_btn" onclick="add()">新增事項</button> <button id="export_btn" onclick="export_todos()">匯出</button> <div id="root"> </div>
<script src="./06_js_datamodel-export.js"></script> </body> </html>
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06_js_datamodel-export.js
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var todos = [];
function render_wrap(){ const body = document.querySelector('body'); const wrap = document.createElement('div'); wrap.className='wrap'; const h2 = document.createElement('h2'); h2.textContent="To Do List"; const hr = document.createElement('hr');
const input_todo = document.querySelector('input'); const add_btn = document.querySelector('#add_btn'); const export_btn = document.querySelector('#export_btn');
const select = document.createElement('select'); const option_normal = document.createElement('option'); option_normal.value = 'normal'; option_normal.textContent = '一般'; option_normal.selected = true; const option_important = document. createElement('option'); option_important.value = 'important'; option_important.textContent = '重要';
const option_urgent = document.createElement('option'); option_urgent.value = 'urgent'; option_urgent.textContent = '緊急';
const root = document.querySelector('#root');
select.append(option_normal); select.append(option_important); select.append(option_urgent); wrap.append(h2); wrap.append(hr); wrap.append(input_todo); wrap.append(select); wrap.append(add_btn); wrap.append(export_btn); wrap.append(root);
body.append(wrap);
select.addEventListener('change', function () { const selectedValue = select.value; select.className = ''; if (selectedValue === 'important') { select.className += ' important'; } else if (selectedValue === 'urgent') { select.className += ' urgent'; } });
input_todo.addEventListener('keydown', function(event) { if (event.key === 'Enter') { add(); } }); }
function add() { const input_todo = document.querySelector('input'); const select_category = document.querySelector('select');
let todo = input_todo.value.trim(); let category = select_category.value; let isCompleted = false;
if(todo !== ''){ todos.push({ title: todo, category: category, isCompleted: isCompleted }); console.log(todos); render(); }else { input_todo.focus(); input_todo.placeholder = "新增待辦事項"; } input_todo.value = ''; }
function render(){ console.log('render....'); const root = document.querySelector('#root'); root.textContent=''; const div_container = document.createElement('div'); div_container.className = 'todos_container'; const ul = document.createElement('ul'); ul.className = 'todoList';
todos.forEach(function(item, index){ const li = document.createElement('li'); const span = document.createElement('span'); const toggleBtn = document.createElement('button'); toggleBtn.className = item.isCompleted ? 'btn_li btn_on' : 'btn_li btn_off'; toggleBtn.textContent = item.isCompleted ? '改為待完成' : '標示已完成'; const delBtn = document.createElement('button'); delBtn.className = "btn_li delBtn"; delBtn.textContent = '刪除';
toggleBtn.onclick = () => { item.isCompleted = !item.isCompleted; render(); }
delBtn.onclick = () => { todos = todos.filter((_, i) => i !== index); render(); };
span.textContent = item.title;
if (item.isCompleted) { const completedText = document.createElement('span'); completedText.textContent = ' (已完成)'; span.appendChild(completedText); }
li.className = item.category;
li.append(span); li.append(toggleBtn); li.append(delBtn); ul.append(li); });
div_container.append(ul); root.append(div_container); };
function export_todos() { let export_msg = ''; todos.forEach(function(item, index) { const number = index + 1; let formattedTitle = item.title; if (item.category === 'important') { formattedTitle = `*${item.title}*`; } else if (item.category === 'urgent') { formattedTitle = `**${item.title}**`; } const status = item.isCompleted ? '(已完成)' : ''; export_msg += `${number}. ${formattedTitle} ${status}\n`; }); alert(export_msg.trim()); }
window.onload=()=>{ render_wrap(); };
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06_js_datamodel-export.css
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| @import url('https://fonts.googleapis.com/css2?family=Kalam:wght@300;400;700&family=Playwrite+CU:wght@100..400&display=swap'); *{ padding: 0; margin: 0; }
.wrap{ margin: 30px auto; width: 800px; min-height: 600px; background-color: #a9c5d5; border-radius: 10px; } h2{ padding-top: 20px; padding-left: 30px; font-family: "Kalam", cursive; font-weight: 400; font-style: normal; font-size: 35px; color:#e8626b; }
input{ width: 450px; margin: 20px 0 20px 30px; padding-left: 5px; font-size: 20px; line-height: 2; border: 1px solid #889fad; color:#000; background-color: #fff;
} input:hover, input:focus { outline: none; background-color: #eaeaa9; } select{ width: 100px; height: 40px; font-size: 20px; line-height: 2; margin-right: 20px; text-align: center; } .important{ color: #ed7023; } .urgent{ color: #cf372c; }
#add_btn , #export_btn{ margin-left: 5px; border: none; font-size: 18px; border-radius: 5px; background-color: #000; color: #fff; padding: 10px; } #add_btn:hover{ cursor: pointer; background-color: #17507b; } #export_btn:hover{ cursor: pointer; background-color: #b91919; } ul{ list-style-type: square; min-height: 400px; margin: 0 30px; padding: 5px; border-radius: 5px; background-color: #8ca8ba; box-shadow: inset 0 4px 8px rgba(0, 0, 0, 0.3);
} li { display: flex; justify-content: space-between; align-items: center; margin: 10px 20px; border-bottom: 1px dotted #28292b; font-size: 18px; color: #000; }
span { display: block; word-wrap: break-word; width: 70%; margin-right: 10px;
}
.btn_li { flex-shrink: 0; width: 30%; margin-left: 10px; }
.btn_on{ color:#f00; background-color: inherit; } .btn_off{ color: #fff; background-color: #17507b; } .btn_on , .btn_off{ width:80px; height: 50px; border: none;
border-radius: 3px; padding: 5px; } .btn_on:hover , .btn_off:hover{ cursor: pointer; }
.delBtn{ width:80px; height: 50px; border: none; font-size: 15px; border-radius: 3px; background-color: #040404; color: #fff; padding: 10px; }
.delBtn:hover{ cursor: pointer; background-color: #b91919; }
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作業取自: https://codelove.tw/@howtomakeaturn/post/YqZr7q
by 站長阿川