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01_jq_menu_table_tin.html
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<!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">
<title>Document</title>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container-fluid mt-3">
<h2 id="myH2">HEADER</h2>
<p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. </p>
<table class="table table-hover table-striped table-bordered border-primary">
<thead class="text-center myH2">
<tr>
<th width="5%">品項</th>
<th width="8%">圖片</th>
<th width="15%">價格</th>
<th width="15%">數量</th>
<th>小計</th>
</tr>
</thead>
<tbody class="text-center myTbody">
<tr>
<td>
<div class="mt-5">1</div>
</td>
<td>
<div class="mt-4">
<img src="https://picsum.photos/id/42/100/100" alt="">
</div>
</td>
<td>
<div class="mt-4">
<input type="number" class="form-control menu-price" value="100" readonly>
</div>
</td>
<td>
<div class="mt-4">
<input type="number" class="form-control menu-num" value="0" min="0">
</div>
</td>
<td>
<div class="mt-4">
<input type="number" class="form-control menu-total" value="0">
</div>
</td>
</tr>
<tr>
<td>
<div class="mt-4">2</div>
</td>
<td>
<div class="">
<img src="https://picsum.photos/id/30/100/100" alt="">
</div>
</td>
<td>
<div class="">
<input type="number" class="form-control menu-price" value="200" readonly>
</div>
</td>
<td>
<div class="">
<input type="number" class="form-control menu-num" value="0" min="0">
</div>
</td>
<td>
<div class="">
<input type="number" class="form-control menu-total" value="0">
</div>
</td>
</tr>
<tr>
<td>
<div class="mt-4">3</div>
</td>
<td>
<div class="">
<img src="https://picsum.photos/id/3/100/100" alt="">
</div>
</td>
<td>
<div class="">
<input type="number" class="form-control menu-price" value="300" readonly>
</div>
</td>
<td>
<div class="">
<input type="number" class="form-control menu-num" value="0" min="0">
</div>
</td>
<td>
<div class="">
<input type="number" class="form-control menu-total" value="0">
</div>
</td>
</tr>
<tr>
<td colspan="5" height="100px">
<div class="mt-4">
小計：total加總 = <span id="myResult"></span>元
</div>
<div class="mt-4">
<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-bs-toggle="modal"
data-bs-target="#exampleModal">
calculate
</button>
</div>
</td>
</tr>
<tr>
<td colspan="2">
<div class="mt-2">合計：</div>
</td>
<!-- <td>
</td> -->
<td colspan="3">
<div class="mt-2" id="myResult">加總結果</div>
</td>
<!-- <td>
</td>
<td>
</td> -->
</tr>
</tbody>
</table>
<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog modal-lg">
<div class="modal-content">
<div class="modal-header">
<h1 class="modal-title fs-5" id="exampleModalLabel">Modal title</h1>
<button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
</div>
<div class="modal-body">
total: <span id="modalResult">12345</span>
<div id="bonus" class="text-danger">
666
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
<button type="button" class="btn btn-primary">Save changes</button>
</div>
</div>
</div>
</div>
<div class="d-grid gap-2">
<button class="btn btn-primary btn-lg" type="button" id="myBtn">加總計算</button>
</div>
<br>
</div>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/js/bootstrap.bundle.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.0/jquery.min.js"
integrity="sha512-3gJwYpMe3QewGELv8k/BX9vcqhryRdzRMxVfq6ngyWXwo03GFEzjsUm8Q7RZcHPHksttq7/GFoxjCVUjkjvPdw=="
crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<script>
$(document).ready(function () {
// 1.綁定
const myPrice = $('.menu-price');
const myNum = $('.menu-num');
const myTotal = $('.menu-total');
const myResult = $('#myResult');
const modalResult = $('#modalResult');
const bonus = $('#bonus');
const myBtn = $('#myBtn');
// console.log('myPrice', myPrice);
// console.log('myNum', myNum);
// console.log('myTotal', myTotal);
// console.log('myBtn', myBtn);
console.log('myResult', myResult);
console.log('modalResult', modalResult);
// 預設display none -> jquery hide()
bonus.hide();
//宣告gstSum()函式
//全部加總
// 1. 取得 全部的total -> sum
// 2. sum -> myResult text
// 3. 重構 ->重複程式碼 變成function
// 4. 呼叫函式 -> getSum();
function getSum() {
let sum = 0;
$.each(myTotal, function (indexInArray, valueOfElement) {
console.log('indexInArray', indexInArray);
console.log('valueOfElement', valueOfElement);
let totalVaule = Number($(valueOfElement).val());
sum = sum + totalVaule;
console.log('sum', sum);
});
myResult.text(sum);
modalResult.text(sum);
bonus.hide();
if (sum > 300) {
let bonusValue = sum * 0.8;
bonus.text(`恭喜您 超過300 獲得 優惠八折 => ${bonusValue}`);
// 顯示bonus
bonus.show();
}
}
// 不能一開始就呼叫getSum()，要等myNum的change事件開始後再呼叫
// getSum();
// 2.宣告myNum的change事件
// myNum.change(function () {
// 原生js
// console.log('myNum', myNum);
// console.log('this', this);
//JQ Object
// console.log('$(this)', $(this));
$(myNum).each(function (index, element) {
// element == this
// console.log('index', index);
// console.log('element', element);
$(element).change(function () {
// $(this)表示滑鼠點擊到的數量.menu-num Class
console.log('this', $(this));
let numValue = $(this).val();
console.log('numValue', numValue);
// console.log('parent.parent.parent.find-price', $(this).parent().parent().parent().find('.menu-price'));
// console.log('parent.parent.parent.find-total', $(this).parent().parent().parent().find('.menu-total'));
let prices = $(this).parent().parent().parent().find('.menu-price');
let totals = $(this).parent().parent().parent().find('.menu-total');
console.log('prices', prices);
// console.log('totalValue', totalValue);
sum = Number(prices.val()) * Number($(this).val());
console.log('sum', sum);
totals.val(sum);
console.log('myTotal.val()', myTotal.val());
getSum();
// // 3.宣告myBtn的click事件
// let total = 0;
// $.each(myTotal, function (key, value) {
// $('#myBtn').click(function () {
// // console.log('myBtn OK');
// console.log('$(this)', $(this));
// console.log('value', value);
// myTotalValue = Number($(value).val());
// console.log('myTotalValue', myTotalValue);
// total = total + Number(myTotalValue);
// console.log('total', total);
// });
// myResult.text(total);
// });
// jquery method parent() 找上一層 推薦使用
// jquery method parents() 找上面全部 少用
// jquery method parentsUntil('tr') 找tr以下全部 更少用
// jquery method find('.menu-price') 往下找menu-price class
// console.log('parent', $(this).parent());
// console.log('parent.parent', $(this).parent().parent());
// console.log('parent.parent.parent', $(this).parent().parent().parent());
// console.log('parent.parent.parent.find-price', $(this).parent().parent().parent().find('.menu-price'));
// console.log('parent.parent.parent.find-total', $(this).parent().parent().parent().find('.menu-total'));
// console.log('parentsUntil(tr)', $(this).parentsUntil('tr'));
// console.log('parentsUntil(tr).parent', $(this).parentsUntil('tr').parent());
// console.log('parentsUntil(tbody)', $(this).parentsUntil('tbody'));
});
});
});
</script>
</body>
</html>