无法从JSP页面获取的参数值

Question

假设

回到Home.jsp代码包含类似

<input name="R" onclick="del(<%=rs.getString("VDB")%>)" type="radio" value="<%=rs.getString("VDB")%>" /> 

// 注按钮：我传递VDB的价值德尔（）

它调用javascript为：

<script type="text/javascript"> 
function del(delno) 
{ 
var ff = document.vendorform; 

var url = "delete.jsp?+vendor="+delno; 
window.navigate("delete_vendor.jsp?+vendor="+delno); 

//window.location.href="delete_vendor.jsp?+vendor="+delno; 
//ff.method = "POST"; 
//ff.action ="delete_vendor.jsp?+vendor="+delno; 
//ff.submit(); 
}//i have used 3 methods to redirect to delete.jsp 

delete.jsp：
此页我要检索厂商的价值我用：

String D1=request.getParameter("vendor"); 

但是，让空值。
任何帮助

Answer 1

var url = "delete.jsp?+vendor="+delno; 

你插错串+vendor。它应该只在url中有vendor。

var url = "delete.jsp?vendor="+delno; 

Answer 2

去掉 “+” 字之前的供应商。更改

var url = "delete.jsp?+vendor="+delno; 

要

var url = "delete.jsp?vendor="+delno;