Use JavaScript to implement simple shopping cart example sharing

This article mainly introduces the code example of using JavaScript to make a simple shopping cart. The editor thinks it is quite good, so I will share it with you now and give it as a reference. Let’s follow the editor to take a look, I hope it can help everyone.

css

<style>
  table{
   text-align: center;

  }
  table img{
   width: 50px;
  }
 a {
  text-decoration: none;
  color: red;
}
 </style>

body

<table border="1" cellspacing="0">
  <thead>
  <tr>
   <th>全选 <input type="checkbox" id="ckAll"/></th>
   <th>商品</th>
   <th>单价</th>
   <th>数量</th>
   <th>操作</th>
  </tr>
  </thead>
  <tbody>
   <tr>
    <td><input type="checkbox" name="ck"/></td>
    <td>![](../img2/1.png)</td>
    <td>3</td>
    <td><input type="number" max="10" min="0" step="1" value="2"/></td>
    <td><a href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="del">删除</a></td>
   </tr>
   <tr><td><input type="checkbox" name="ck"/></td>
    <td>![](../img2/2.png)</td>
    <td>3</td>
    <td><input type="number" max="10" min="0" step="1" value="3"/></td>
    <td><a href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="del">删除</a></td>


   </tr>
   <tr><td><input type="checkbox" name="ck"/></td>
    <td>![](../img2/3.png)</td>
    <td>3</td>
    <td><input type="number" max="10" min="0" step="1" value="1"/></td>
    <td><a href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="del">删除</a></td>


   </tr></tbody>
  <tfoot>
  <tr>
   <td colspan="3" align="right">总价:</td>
   <td colspan="2"></td>
  </tr>
  </tfoot>

 </table>
 <a href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="dels">删除选中项</a>

js

<script>
  window.onload=function(){
   document.getElementById("ckAll").onclick=function(){//当点击全选的复合框时触发事件
    var cks = document.getElementsByName("ck");//获取ck对象
    for(var i=0;i<cks.length;i++){ //循环得到单个tr
     cks[i].checked=this.checked; //得到的每个tr的点击都等于ckAll的点击
    }
   }
   var cks = document.getElementsByName("ck");//创建ck对象
   for(var i=0;i<cks.length;i++){ //循环得到单个tr
    cks[i].onclick=function(){ // 当点击每个当tr的时候都会触发点击事件
      for(var i=0;i<cks.length;i++){// 循环得到单个td
       if(!cks[i].checked){ //如果单个特点的点击等于false 就返回
        document.getElementById("ckAll").checked = false;//那么ckAll就等于false
        return;
       }
      }
     document.getElementById("ckAll").checked = true;//否则就等于true 说明为全选状态
    }
   }
   getSum();
    function getSum(){ //计算的方法
     var tbody = document.getElementsByTagName("tbody")[0];//创建tbody对象
     var sum =0;//先定义sum为0
      for(var i =0;i<tbody.children.length;i++){ //循环得到tr
       var tr = tbody.children[i]; //tbody中的子节点就是tr
       var td = tr.children; //tr的子节点是 td
       var price = parseFloat(td[2].innerText);//td的第二列是价格 得到价格
       var count = parseFloat(td[3].children[0].value); //第三列是数量
       sum+=price*count; //总和就等于价格*数量
       td[3].children[0].onblur=function(){ //当失去焦点的时候触发事件
        getSum();
       }
      }
     var tfoot = document.getElementsByTagName("tfoot")[0]; //创景tfoot对象
     tfoot.children[0].children[1].innerHTML =sum; //tfootd子节点 等于总和
    }

   var dels = document.getElementsByClassName("del");//创建del对象
   for(var i = 0;i<dels.length;i++){//循环得到
    dels[i].onclick=function(){
     this.parentNode.parentNode.remove();
     getSum();
    }
   }
   document.getElementsByClassName("dels")[0].onclick=function(){
     var cks = document.getElementsByName("ck");
    for(var i = cks.length-1;i>=0;i--){
      if(cks[i].checked){
       cks[i].parentNode.parentNode.remove();
      }
    }
    getSum();

   }

  }
</script>

Rendering

This shopping cart was made when I was learning js. It is relatively simple, but the basic functions are still there:

1. It can be fully Select, single selection.

2. Can delete individually, delete selected items.

3. The total can change according to the change of quantity.

It will be better if you use the online editor to check the effect.

If you have any questions, you can communicate at any time... (I will use jQury in two days. Example of making a shopping cart)

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