我做一个购物车如图:
我想要显示出总价格,其中单个商品的总价已经在后面给出,如何计算出总价格:
字段说明:
表单叫pList,商品总价叫thisTotal;总价叫total.以下是我的代码:
<%@ page contentType="text/html" pageEncoding="GBK"%> <%@ page import="java.util.*" %> <script language="javascript"> function getTatal(){ <!--得到总价方法,此时是错误的--> var arr=new Array(); arr= document.pList.thisTotal; alert(arr); var count = ""; for(var i = 0; i <arr.length; i++) { alert(arr[i].value); count += arr[i].value; } document.pList.total.value=count; } </script> <center> <h1>购物车列表</h1> <form name="pList" action="update_car.jsp" method="post"> <table> <TR> <td >名称</span></td> <td >价格</td> <td >简介</td> <td >数量</td> <td >总价</td> </TR> <% List all =(List)request.getAttribute("carList"); //得到购物车里面的商品 Map<Integer,Integer> carMap = (Map<Integer,Integer>) session.getAttribute("carMap") ; //得到购物车 Iterator iter = all.iterator() ; while(iter.hasNext()){ pageContext.setAttribute("pro",iter.next()) ; %> <TR > <td >${pro.productName}</td> <td >${pro.price}</td> <td >${pro.note}</td> <td> <input type="text" name="${pro.productId}" value=${carMap[pro.productId]} /> <input type="submit" value="修改数量"> </td> <td> <input type="text" name="thisTotal" value=${carMap[pro.productId]*pro.price} /> </td> </TR> <% } %> </table> <input type="text" name="total" value="" onLoad="getTotal()" /> <input type="button" value="去结算" onclick="gocheck()"> </form> </center>