bom的学习已经接近尾声!终于可以写动态的购物车了!分享一下:
以下是代码和注解(开始的时候一定要把注解写清楚不然容易把自己绕晕!! 注意this 和 let 的用法!!!)
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>原生JS实现购物车结算功能代码</title>
<link rel="stylesheet" href="../css/style.css" />
<style>
.reduce {
cursor: no-drop;
}
/* @charset "utf-8"; */
*{margin:0;padding:0;list-style-type:none;}
a{color:#666;text-decoration:none;}
table{border-collapse:collapse;border-spacing:0;border:0;}
body{color:#666;font:12px/180% Arial, Helvetica, sans-serif, "新宋体";}
clearfix:after{content:".";display:block;height:0;clear:both;visibility:hidden}
.clearfix{display:inline-table}
*html .clearfix{height:1%}
.clearfix{display:block}
*+html .clearfix{min-height:1%}
.fl{float:left;}
.fr{float:right;}
/*素材家园 - www.sucaijiayuan.com*/
.catbox{940px;margin:100px auto;}
.catbox table{text-align:center;100%;}
.catbox table th,.catbox table td{border:1px solid #CADEFF;}
.catbox table th{background:#e2f2ff;border-top:3px solid #a7cbff;height:30px;}
.catbox table td{padding:10px;color:#444;}
.catbox table tbody tr:hover{background:RGB(238,246,255);}
.checkbox{60px;}
.check-all{ vertical-align:middle;}
.goods{300px;}
.goods span{180px;margin-top:20px;text-align:left;float:left;}
.goods img{100px;height:80px;margin-right:10px;float:left;}
.price{130px;}
.count{90px;}
.count .add, .count input, .count .reduce{float:left;margin-right:-1px;position:relative;z-index:0;}
.count .add, .count .reduce{height:23px;17px;border:1px solid #e5e5e5;background:#f0f0f0;text-align:center;line-height:23px;color:#444;}
.count .add:hover{color:#f50;z-index:3;border-color:#f60;cursor: pointer;}
.count .reduce:hover{color:#f50;z-index:3;}
.count input{50px;height:15px;line-height:15px;border:1px solid #aaa;color:#343434;text-align:center;padding:4px 0;background-color:#fff;z-index:2;}
.subtotal{150px;color:red;font-weight:bold;}
.operation span:hover,a:hover{cursor:pointer;color:red;text-decoration:underline;}
.foot{margin-top:0px;color:#666;height:48px;border:1px solid #c8c8c8;border-top:0;background-color:#eaeaea;background-image:linear-gradient(RGB(241,241,241),RGB(226,226,226));position:relative;z-index:8;}
.foot div, .foot a{line-height:48px;height:48px;}
.foot .select-all{80px;height:48px;line-height:48px;color:#666;text-align:center;}
.foot .delete{padding-left:10px;}
.foot .closing{border-left:1px solid #c8c8c8;103px;text-align:center;color:#666;font-weight:bold;cursor:pointer;background-image:linear-gradient(RGB(241,241,241),RGB(226,226,226));}
.foot .closing:hover{background-image:linear-gradient(RGB(226,226,226),RGB(241,241,241));color:#333;}
.foot .total{margin:0 20px;cursor:pointer;}
.foot #priceTotal, .foot #selectedTotal{color:red;font-family:"Microsoft Yahei";font-weight:bold;}
.foot .selected{cursor:pointer;}
.foot .selected .arrow{position:relative;top:-3px;margin-left:3px;}
.foot .selected .down{position:relative;top:3px;display:none;}
.show .selected .down{display:inline;}
.show .selected .up{display:none;}
.foot .selected:hover .arrow{color:red;}
.foot .selected-view{938px;border:1px solid #c8c8c8;position:absolute;height:auto;background:#ffffff;z-index:9;bottom:48px;left:-1px;display:none;}
.show .selected-view{display:block;}
.foot .selected-view div{height:auto;}
.foot .selected-view .arrow{font-size:16px;line-height:100%;color:#c8c8c8;position:absolute;right:330px;bottom:-9px;}
.foot .selected-view .arrow span{color:#ffffff;position:absolute;left:0px;bottom:1px;}
#selectedViewList{padding:10px 20px 10px 20px;}
#selectedViewList div{display:inline-block;position:relative;100px;height:80px;border:1px solid #ccc;margin:10px;float:left;}
#selectedViewList div img{100px;height:80px;margin-right:10px;float:left;}
#selectedViewList div span{display:none;color:#ffffff;font-size:12px;position:absolute;top:0px;right:0px;60px;height:18px;line-height:18px;text-align:center;background:#000;cursor:pointer;}
#selectedViewList div:hover span{display:block;}
</style>
</head>
<body>
<div class="catbox">
<table id="cartTable">
<thead>
<tr>
<th>
<label>
<input class="check-all check" type="checkbox" /> 全选</label>
</th>
<th>商品</th>
<th>单价</th>
<th>数量</th>
<th>小计</th>
<th>操作</th>
</tr>
</thead>
<tbody>
<tr>
<td class="checkbox"><input class="check-one check" type="checkbox" /></td>
<td class="goods"><img src="../images/1.jpg" alt="没有图片" /><span>Casio/卡西欧 EX-TR350</span></td>
<td class="price">5999.88</td>
<td class="count"><span class="reduce"></span>
<input class="count-input" type="text" value="1" />
<span class="add">+</span></td>
<td class="subtotal">5999.88</td>
<td class="operation"><span class="delete">删除</span></td>
</tr>
<tr>
<td class="checkbox"><input class="check-one check" type="checkbox" /></td>
<td class="goods"><img src="../images/2.jpg" alt="没有图片" /><span>Canon/佳能 PowerShot SX50 HS</span></td>
<td class="price">3888.50</td>
<td class="count"><span class="reduce"></span>
<input class="count-input" type="text" value="1" />
<span class="add">+</span></td>
<td class="subtotal">3888.50</td>
<td class="operation"><span class="delete">删除</span></td>
</tr>
<tr>
<td class="checkbox"><input class="check-one check" type="checkbox" /></td>
<td class="goods"><img src="../images/3.jpg" alt="没有图片" /><span>Sony/索尼 DSC-WX300</span></td>
<td class="price">1428.50</td>
<td class="count"><span class="reduce"></span>
<input class="count-input" type="text" value="1" />
<span class="add">+</span></td>
<td class="subtotal">1428.50</td>
<td class="operation"><span class="delete">删除</span></td>
</tr>
<tr>
<td class="checkbox"><input class="check-one check" type="checkbox" /></td>
<td class="goods"><img src="../images/4.jpg" alt="没有图片" /><span>Fujifilm/富士 instax mini 25</span></td>
<td class="price">640.60</td>
<td class="count"><span class="reduce"></span>
<input class="count-input" type="text" value="1" />
<span class="add">+</span></td>
<td class="subtotal">640.60</td>
<td class="operation"><span class="delete">删除</span></td>
</tr>
</tbody>
</table>
<div class="foot" id="foot">
<a class="fl" id="deleteAll" href="javascript:;">删除</a>
<div class="fr closing" onclick="getTotal();">结 算</div>
<input type="hidden" id="cartTotalPrice" />
<div class="fr total">合计：￥<span id="priceTotal">0.00</span></div>
<div class="fr selected" id="selected">已选商品<span id="selectedTotal">0</span>件<span
class="arrow up">︽</span><span class="arrow down">︾</span></div>
<div class="selected-view">
<div id="selectedViewList" class="clearfix">
<div><img src="../images/1.jpg"><span>取消选择</span></div>
</div>
<span class="arrow">◆<span>◆</span></span>
</div>
</div>
</div>
</body>
<script>
var checkAll = document.getElementsByClassName("check-all")[0];
var checkOneList = document.getElementsByClassName("check-one");
var addList = document.getElementsByClassName("add");
var reduceList = document.getElementsByClassName("reduce");
var deleteList = document.getElementsByClassName("delete");
var deleteAll = document.getElementById("deleteAll");
var selectedTotal = document.getElementById("selectedTotal");
var priceTotal = document.getElementById("priceTotal");
// 删除 两个细节
// 1. 单删
// 每次删除商品之后 判断 如果剩余的商品全部被选中 => 全选框 变为选中状态
// 2. 商品全部删除之后 (bug 商品全部删除之后 全选框依旧被选中)
// 原因 (isCheckAll 封装时用的是假设法 商品全部删除之后,checkOneList为0 循环不会执行 flag依旧为true)
// 解决方法 加一个长度判断 如果checkOneList为0(没有商品) 全选框取消全选
// 单删
for (let i = 0; i < deleteList.length; i++) {
let del = deleteList[i];
del.onclick = function () {
if (confirm("是否删除该商品?")) {
var tr = parent(parent(this));
console.log(tr);
tr.remove();
// 先删除 ,在判断 剩余的商品全部被选中
// a. 每次删除商品之后 判断 如果剩余的商品全部被选中 => 全选框 变为选中状态
// var flag = true;
// for (let i = 0; i < checkOneList.length; i++) {
// let checkOne = checkOneList[i];
// if (!checkOne.checked) {
// flag = false;
// break;
// }
// }
// checkAll.checked = flag;
checkAll.checked = isCheckAll();
getTotal();// 结算
}
}
}
// 多删 删除选中的商品
//数组坍塌
// 0 1 2 3
// [checkOne,checkOne,checkOne,checkOne]
deleteAll.onclick = function () {
// a. 找到所有的单选框中 为 选中状态的单选框 => tr =>删除
for (let i = 0; i < checkOneList.length; i++) {
let checkOne = checkOneList[i];
if (checkOne.checked) {
var tr = parent(parent(checkOne));
tr.remove();
i--;
}
}
checkAll.checked = false;
// checkAll.checked = isCheckAll();
getTotal();// 结算
}
// 加号事件
for (let i = 0; i < addList.length; i++) {
let add = addList[i];
add.onclick = function () {
// console.log(this);
// a. 输入框 数量 加一
var countInput = prev(this); // 找到加号前的 countInp
// console.log(countInput);
var num = countInput.value; //取值
num++; //自增
countInput.value = num; //放回去
// b. 小计更新 = 单价*数量
// 数量 已经有了
// 单价
var parentTd = parent(this); // 找到加号的parentTd
var priceTd = prev(parentTd); // parentTd前面的priceTd(价格)
var subtotalTd = next(parentTd); // parentTd前面的subtotalTd
console.log(priceTd, subtotalTd);
var price = priceTd.textContent * 1;
subtotalTd.textContent = (price * num).toFixed(2);
// 3. 减号按钮的 “-” 出现
var reduce = prev(countInput);
reduce.textContent = "-";
reduce.style.cursor = "pointer";
getTotal();// 结算
}
}
// 减号事件
for (let i = 0; i < reduceList.length; i++) {
let reduce = reduceList[i];
reduce.onclick = function () {
// a. 输入框 数量 减一
var countInp = next(this);
var num = countInp.value;
// c. 减之前 判断 如果数量为1 不能减
if (num == 1) {
console.log("亲,不能在减了");
return false;
}
num--; //自减
// d 减之后 判断 如果数量为1 减号按钮的 “-” 消失 手势禁止
if (num == 1) { // 由2变为1的一瞬间
this.textContent = "";
this.style.cursor = "no-drop";
}
countInp.value = num;
// b. 小计更新 = 单价*数量
// 数量 已经有了
// 单价
var parentTd = parent(this); // 找到加号的parentTd
var priceTd = prev(parentTd); // parentTd前面的priceTd(价格)
var subtotalTd = next(parentTd); // parentTd前面的subtotalTd
console.log(priceTd, subtotalTd);
var price = priceTd.textContent * 1;
subtotalTd.textContent = (price * num).toFixed(2);
getTotal();// 结算
}
}
// 全选功能
// 所有的单选 跟随全选的状态
checkAll.onclick = function () {
var status = this.checked;
console.log(status);
for (var i = 0; i < checkOneList.length; i++) {
var checkOne = checkOneList[i];
checkOne.checked = status;
}
getTotal();// 结算
}
// 反选功能
// 每次点击单选 都要进行判断 所有的单选是否都选中
// 如果所有的单选选中 全选也需要改为选中状态
// 只要有一个未选中 则 全选不选
// 循环绑定事件
for (let i = 0; i < checkOneList.length; i++) {
let checkOne = checkOneList[i];
checkOne.onclick = function () {
// var flag = true; //假设全被选中
// for (let i = 0; i < checkOneList.length; i++) {
// let checkOne = checkOneList[i];
// if (!checkOne.checked) { //checkOne.checked == false 存在未被选中的
// flag = false;
// break;
// }
// }
checkAll.checked = isCheckAll();
getTotal();// 结算
}
}
function isCheckAll() {
var flag = true; //假设全被选中
for (let i = 0; i < checkOneList.length; i++) {
let checkOne = checkOneList[i];
if (!checkOne.checked) { //checkOne.checked == false 存在未被选中的
flag = false;
break;
}
}
// 2. 商品全部删除之后 (bug 商品全部删除之后 全选框依旧被选中)
// 原因 (isCheckAll 封装时用的是假设法 商品全部删除之后,checkOneList为0 循环不会执行 flag依旧为true)
// 解决方法 加一个长度判断 如果checkOneList为0(没有商品) 全选框取消全选
flag = checkOneList.length == 0 ? false : flag;
return flag;
}
// 结算
function getTotal() {
// 每次点击单选 将选中的单选框对应的商品数量和小计累加 =>结算
var sum = 0;
var allPrice = 0;
for (let i = 0; i < checkOneList.length; i++) {
let checkOne = checkOneList[i];
if (checkOne.checked) { //被选中
var parentTr = parent(parent(checkOne));
// console.log(parentTr);
var countInput = parentTr.getElementsByClassName("count-input")[0];
var subtotalTd = parentTr.getElementsByClassName("subtotal")[0];
var num = countInput.value * 1;
var subtotal = subtotalTd.textContent * 1
sum += num;
allPrice += subtotal;
}
}
console.log(sum, allPrice);
selectedTotal.textContent = sum;
priceTotal.textContent = allPrice.toFixed(2);
}
function parent(ele) {
return ele.parentElement || ele.parentNode;
}
function prev(ele) {
return ele.previousElementSibling || ele.previousSibling;
}
function next(ele) {
return ele.nextElementSibling || ele.nextSibling;
}
</script>
</html>
以上就是完整代码啦!感兴趣的朋友可以看看哟!! (哈哈哈哈 来自一个菜鸟的得瑟!)