How to implement the shopping cart function in javascript (code)-JS Tutorial-php.cn

How to implement the shopping cart function in javascript (code)

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Release： 2018-08-23 11:55:12

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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>

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