Not able to retrieve value of parameters from JSP page

Question

Suppose

home.jsp code contain a button like

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

// note : i am passing value of VDB in del()

it is calling javascript as :

<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 :
on this page i want to retrieve value of i used : 价值：

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

But getting null value.
Any help

Answer 1

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

you have inserted wrong string +vendor . it should be only vendor in url.

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

Answer 2

Remove the "+" before the word vendor. Change

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

To

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