How to implement the shopping cart function in javascript (code)
The content of this article is about how to implement the shopping cart function (code) in JavaScript. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>购物车</title>
<style>
table{
width: 600px;
margin: 0 auto;
border-collapse: collapse;
}
td{
border: 1px solid silver;
line-height: 40px;
text-align: center;
}
.btnl,.btnr{
border-style: none;
outline: none;
color: deeppink;
}
.txt{
width: 30px;
height: 30px;
border-style: none;
outline: none;
text-align: center;
}
</style>
</head>
<body>
<table>
<tr>
<td><button id="btna">全选</button></td>
<td>序号</td>
<td>名称</td>
<td>价钱</td>
<td>数量</td>
<td>小计</td>
<td>操作</td>
</tr>
<tr class="trinfo">
<td><input class="ckbox" type="checkbox"/></td>
<td>1</td>
<td>毛衣</td>
<td><span class="price">99</span>￥</td>
<td><button class="btnl">-</button><input type="text" class="txt" value="1"/><button class="btnr">+</button></td>
<td><span class="smallprice">99</span>￥</td>
<td><button class="btndelete">删除</button></td>
</tr>
<tr class="trinfo">
<td><input class="ckbox" type="checkbox"/></td>
<td>2</td>
<td>短袖</td>
<td><span class="price">108</span>￥</td>
<td><button class="btnl">-</button><input type="text" class="txt" value="1"/><button class="btnr">+</button></td>
<td><span class="smallprice">108</span>￥</td>
<td><button class="btndelete">删除</button></td>
</tr>
<tr class="trinfo">
<td><input class="ckbox" type="checkbox"/></td>
<td>3</td>
<td>运动鞋</td>
<td><span class="price">10000</span>￥</td>
<td><button class="btnl">-</button><input type="text" class="txt" value="1"/><button class="btnr">+</button></td>
<td><span class="smallprice">10000</span>￥</td>
<td><button class="btndelete">删除</button></td>
</tr>
<tr class="trinfo">
<td><input class="ckbox" type="checkbox"/></td>
<td>4</td>
<td>凉鞋</td>
<td><span class="price">25</span>￥</td>
<td><button class="btnl">-</button><input type="text" class="txt" value="1"/><button class="btnr">+</button></td>
<td><span class="smallprice">25</span>￥</td>
<td><button class="btndelete">删除</button></td>
</tr>
<tr >
<td><button id="btnf">反选</button></td>
<td colspan="6"><span>总计：<span class="totle">0</span>￥</span><button>去结算</button></td>
</tr>
</table>
<script>
//获取左右的按钮集合
var btnleft=document.getElementsByClassName("btnl");
var btnright=document.getElementsByClassName("btnr");
//获取表示数量的class名为txt的input元素集合
var txt=document.getElementsByClassName("txt");
//获取表示单价的class名为price的span元素集合
var price=document.getElementsByClassName("price");
//获取表示小计的class名为smallprice的span元素集合
var small=document.getElementsByClassName("smallprice");
//获取表示总价的class名为totle的span元素
var totle=document.getElementsByClassName("totle")[0];
//获取全选反选按钮和选择框
var btna=document.getElementById("btna");
var btnf=document.getElementById("btnf");
var box=document.getElementsByClassName("ckbox");
//获取删除按钮
var btndelete=document.getElementsByClassName("btndelete");
var trlist=document.getElementsByClassName("trinfo");
var totleprice=0; //定义全局变量totleprice的初值为0
//给数量左右两边的+-添加点击事件
for(var i=0;i<btnleft.length;i++)
{
btnleft[i].index=i; //把i的值赋给btnleft[i]的index
btnleft[i].onclick=function (){ //获取当前对应的文本框的值
var val=txt[this.index].value;
val--; //控制其数量的值不能小于1
if(val<=1)
{
val=1;
}
txt[this.index].value=val; //把更新了的val值再赋给txt[this.index].value
addprice(this.index); //调用一下addprice()使其在当前变化下执行
}
btnright[i].index=i; //把i的值赋给btnright[i]的index
btnright[i].onclick=function (){
var val=txt[this.index].value;
val++;
txt[this.index].value=val;
addprice(this.index);
}
//给checkbox添加点击事件
box[i].onclick=function (){
showtotleprice();
}
//给删除添加点击事件
btndelete[i].index=i;
btndelete[i].onclick=function (){
totleprice-=parseFloat(small[this.index].innerText); //将总计里面对应的价格也减掉
totle.innerText=totleprice;
trlist[this.index].remove(); //去掉对应的那一行元素
//重新更新索引 防止其他操作出错
for(var k=0;k<trlist.length;k++)
{
trlist[k].index=k;
btndelete[k].index=k;
btnleft[k].index=k;
btnright[k].index=k;
}
}
} //计算小计
function addprice(index){
small[index].innerText=(price[index].innerText*txt[index].value);
} //计算总计
function showtotleprice(){
totleprice=0;
for(var i=0;i<small.length;i++)
{
if(box[i].checked)
{
totleprice+=parseFloat(small[i].innerText);
}
}
totle.innerText=totleprice;
}
//全选
btna.onclick=function (){
for(var i=0;i<box.length;i++)
{
box[i].checked=true;
}
showtotleprice();
}
//反选
btnf.onclick=function (){
for(var i=0;i<box.length;i++)
{
box[i].checked=!box[i].checked;
}
showtotleprice();
}
</script>
</body>
</html>Related recommendations:
javascript - Business logic of the shopping cart module
Use native JavaScript to implement shopping cart and shopping page
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