<input type="hidden" id="district<%=i%>" name="district" >
<script>
document.getElementById("district"+i).value=document.getElementById("shuru"+i).value
</script>
如题，我想将hidden里的value 设置为上面id为shuru的的值
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@page import="Db.Db"%>
<%@page import="java.text.SimpleDateFormat"%>
<%@ page import="java.sql.*"%>
<%@ page import="java.util.Date"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!-- 修改前-->
<%
request.setCharacterEncoding("utf-8");
String uaddr = null;
int uid = 0;
String uname = request.getParameter("uname");
String[] strgid = request.getParameterValues("addOrders");
Connection conn = null;
Statement stmt = null;
Statement stmt1 = null;
ResultSet rs = null;
ResultSet rs1 = null;
conn = Db.getconn();
stmt = conn.createStatement();
stmt1 = conn.createStatement();
System.out.println(uname);
rs1 = stmt1.executeQuery("select * from user where uname = '"+ uname + "' ");
if (rs1.next()) {
uaddr = rs1.getString("uaddr");
uid = rs1.getInt("uid");
}
%>
<%
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String nowTime = sdf.format(new Date());
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>购物车</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<form method="post" action="servlet/AddOrdersServlet" name="numSender">
<input type="hidden" name="uid" value="<%=uid%>">
<input type="hidden" name="uname" value="<%=uname%>">
<input type="hidden" name="oaddr" value="<%=uaddr%>">
<input type="hidden" name="dealtime" value="<%=nowTime%>">
<!-----script放到循环外------->
<script type="text/javascript">
function jianC(i,p1) {
/*定义变量K，用商品数量输入框里面的数字赋值*/
var k =document.getElementById("shuru"+i);//获取数量输入控件
var v=parseInt(k.value,10);
v--;
/*点击-号按钮会递减商品价格*/
if (v < 1) {
alert("亲，商品数量不能小于1！");
return//超限退出
}
k.value=v;
k.setAttribute('sum',v*p1)//将这个物品的小计放到自定义属性sum中，方便计算总价
setTotal()//重新设置总价钱
}
function adddC(i,p1) {
/*点击+号按钮会递加商品数量*/
var k =document.getElementById("shuru"+i);//获取数量输入控件
var v=parseInt(k.value,10);
v++;
if (v > 99) {
alert("您所选择的数量已经到达库存上限！");
return//超限退出
}
k.value=v;
k.setAttribute('sum',v*p1)//将这个物品的小计放到自定义属性sum中，方便计算总价
setTotal()//重新设置总价钱
}
function setTotal(){//设置总价
var o=document.getElementsByName('init_num');//获取数量输入框
var sum=0;
for(var i=0;i<o.length;i++)sum+=parseInt(o[i].getAttribute('sum')||0)
document.getElementById("cost").value = sum + "元"
}
function sendNum() {
alert("xxxxxx");
document.getElementById("district"+i).value=document.getElementById("shuru"+i).value;
alert("aaaaaaaaaaa");
}
</script>
<table border=1 align="center">
<tr>
<td colspan="4" align="center">购物车</td>
</tr>
<tr>
<td align="center">商品</td>
<td align="center">数量</td>
<td align="center" colspan="1">操作</td>
</tr>
<%
for (int i = 0; i < strgid.length; i++) {
int gid = Integer.parseInt(strgid[i]);
rs = stmt.executeQuery("select * from goods where gid =" + gid);
if (rs.next()) {
String strgprice = rs.getString("gprice");
Double p =Double.parseDouble(strgprice);
// System.out.println("p="+p);
%>
<!-- ss -->
<tr>
<td><img src="<%=rs.getString("gpicture")%>"> <%=rs.getString("gname")%></td>
<td><input type="button" id="jian" onClick="jianC(<%=i%>,<%=p%>)" value="-"><!-----传入循环i和单价------->
<input id="shuru<%=i%>" name="init_num" class="input_text" type="text" value="0" size="3"><!-----id连接上i变为唯一------->
<input type="hidden" id="district<%=i%>" name="district" >
<script>
document.getElementById("district"+i).value=document.getElementById("shuru"+i).value
</script>
<input type="button" id="addd" onClick="adddC(<%=i%>,<%=p%>)" value="+"><!-----传入循环i和单价-------></td>
<td>
<input type="checkbox" name="gid" value="<%=gid %>">
</td>
</tr>
<%
}
}
rs.close();
rs1.close();
stmt.close();
stmt1.close();
conn.close();
%>
<tr>
<td colspan="4" align="center">
总价:<input id="cost" class="input_text" type="text" value="0"
size="3" value="0"></td>
</tr>
<tr>
<td colspan="5" align="center">
<button id="buy_anniu" type="submit" onClick="sendNum()">提交</button>
<button type="reset">重置</button>
</td>
</tr>
</table>
</form>
</body>
</html>
使用jquery
使用jQuery $('#shuru').val() 把前面获得值复制到value上就行了
<input id="shuru" name="init_num" class="input_text" type="text" value="0" size="3">
<input type="hidden" id="district" name="district" value="" >
<script>
document.getElementById('district').value=document.getElementById('shuru').value
</script>
id唯一可以使用上面的代码，如果不以为就不好搞了，要通过DOM关系来获取对象。
在提交的时候onclink一下，然后获取id为shuru的值，并把获取到的值传给district。
注意id一定不要重复
<input id="shuru<%=i%>" name="init_num" class="input_text" type="text" value="0" size="3"><!-----id连接上i变为唯一------->
<input type="hidden" id="district<%=i%>" name="district" value="" ><!-----id连接上i变为唯一------->
传入循环遍历使id不重复。然后document.getElementById("district"+i)就可以获取到对应的隐藏控件设置值了，如下
function jianC(i,p1) {
/*定义变量K，用商品数量输入框里面的数字赋值*/
var k =document.getElementById("shuru"+i);//获取数量输入控件
var v=parseInt(k.value,10);
v--;
/*点击-号按钮会递减商品价格*/
if (v < 1) {
alert("亲，商品数量不能小于1！");
return//超限退出
}
document.getElementById("district"+i).value=v;///////////////设置值
k.value=v;
k.setAttribute('sum',v*p1)//将这个物品的小计放到自定义属性sum中，方便计算总价
setTotal()//重新设置总价钱
}
function adddC(i,p1) {
/*点击+号按钮会递加商品数量*/
var k =document.getElementById("shuru"+i);//获取数量输入控件
var v=parseInt(k.value,10);
v++;
if (v > 99) {
alert("您所选择的数量已经到达库存上限！");
return//超限退出
}
document.getElementById("district"+i).value=v;////////////设置值
k.value=v;
k.setAttribute('sum',v*p1)//将这个物品的小计放到自定义属性sum中，方便计算总价
setTotal()//重新设置总价钱
}