How to implement the shopping cart price calculation function with jQuery

How to implement the shopping cart price calculation function with jQuery_jquery

WBOY

Release： 2016-05-16 16:07:45

Original

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The example in this article describes how jQuery implements the shopping cart price calculation function. Share it with everyone for your reference. The details are as follows:

Purpose

Modify the number of items in the shopping cart in the html interface, and modify the subtotal and total of the shopping cart product prices.

Implementation ideas

1. When you click to enter the interface and refresh, the onload="" method in the body is triggered and jumps to the JS code. The reason for this is that in the database we will only store the number of items that a customer intends to purchase, but will not store the subtotal of the price of each type of item and the total price of all items in the shopping cart. The purpose of initialization is to store these items. The numbers are calculated and displayed on the front interface.

2. When the quantity of each item in the quantity input box is changed, the price of the entire shopping list item, the subtotal and total of the item will change according to the quantity.

Finished product sample display

All codes (Firefox)

<!DOCTYPE HTML>
<html>
 <head>
  <title>cart</title>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
  <!-- 要把jquery-1.9.1.min.js导进去，不导出不来 -->
  <script type="text/javascript" src="jquery-1.9.1.min.js"></script>
  <script language="javascript">
$(function(){
var size=3.0*$('#image1').width();
$("#image1").mouseover(function(event) {
var $target=$(event.target);
if($target.is('img'))
{
$("<img id='tip' src='"+$target.attr("src")+"'>").css({
"height":size,
"width":size,
}).appendTo($("#imgtest"));/*将当前所有匹配元素追加到指定元素内部的末尾位置。*/
}
}).mouseout(function() {
$("#tip").remove();/*移除元素*/
})

})
</script>
  <script type="text/javascript">
function total(id)
{
/*计算单个的价格*/
var quantity=document.getElementById("quantity"+id).value;
var price=document.getElementById("price"+id).value;
var smallTotal=quantity*price;
var smallT=document.getElementById("smallTotal"+id);
smallT.innerHTML=smallTotal;

/*计算总价格*/
var totalPrice=0;
for(var a=1;a<3;a++){
var quantity=document.getElementById("quantity"+a).value;
var price=document.getElementById("price"+a).value;
var smallTotal=quantity*price;
totalPrice=totalPrice+smallTotal;
}
var total=document.getElementById("total");
total.innerHTML=totalPrice;
}
</script>
  <script type="text/javascript">
function initialize()
{
var totalPrice=0;
for(var a=1;a<3;a++){
var quantity=document.getElementById("quantity"+a).value;
var price=document.getElementById("price"+a).value;
var smallTotal=quantity*price;
totalPrice=totalPrice+smallTotal;
/*alert(smallTotal);*/
var smallT=document.getElementById("smallTotal"+a);
smallT.innerHTML=smallTotal;
}
/*取出购物车的所有商品的价格总和*/
var total=document.getElementById("total");
total.innerHTML=totalPrice;
}
</script>
  <style type="text/css">
#imgtest {
 position: absolute;
 top: 100px;
 left: 400px;
 z-index: 1;
}
table {
 left: 100px;
 font-size: 20px;
}
</style>
 </head>
 <body onload="initialize()">
  <div id="imgtest"></div>
  <br />
  <br />
  <table border="1" style="text-align: center;" align="center">
   <thead style="height: 50">
    <td style="WIDTH: 300px">
     商品名称
    </td>
    <td style="WIDTH: 60px">
     图片
    </td>
    <td style="WIDTH: 170px">
     数量
    </td>
    <td style="WIDTH: 170px">
     价格
    </td>
    <td style="WIDTH: 250px">
     小计
    </td>
   </thead>
   <tbody>
    <tr>
     <td class="name">商品1</td>
     <td class="image">
      <img src="1.jpg" width="40px" height="40px" id="image1"/>
     </td>
     <td class="quantity">
      <input id="quantity1" value="1" onblur="total(1);"/>
     </td>
     <td class="price">
      <input type="hidden" id="price1" value="20"/>
      20
     </td>
     <td class="total">
      <span id="smallTotal1"></span> 元
     </td>
    </tr>
    <tr>
     <td class="name">商品2</td>
     <td class="image">
      <img src="1.jpg" width="40px" height="40px" id="image1"/>
     </td>
     <td class="quantity">
      <input id="quantity2" value="2" onblur="total(2);"/>
     </td>
     <td class="price">
      <input type="hidden" id="price2" value="30"/>
      30
     </td>
     <td class="total">
      <span id="smallTotal2"></span> 元
     </td>
    </tr>
    <tr>
     <td colspan="4" class="cart_total">
      <br>
     </td>
     <td>
      <span class="red">总计:</span><span id="total"></span>  元
     </td>
    </tr>
   </tbody>
  </table>
 </body>
</html>

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I hope this article will be helpful to everyone’s jQuery programming.