Clicking List items to invoke a servlet

Question

How can I use a list box item to fire a servlet.

Answer 1

I have the servlet being called but I need to sent the selected item of the list as argument0 but nothing I have tried will work.
My JSP Code:
<P>
Pick a Drawing number from list to see Details<BR>
<jsp:useBean id="dwglist"
     type="com.ibm.drawinginquiry.rational.DrawingList" scope="session"></jsp:useBean>
<BR></P><FORM action="/DrawingInquiry/DrawingInquiryServlet">
<SELECT size="8" name="dwgno" onchange="gotoPage(this.selectedIndex)">
     <%
     for (int i=0; i<dwglist.getDwgList().length; i++){
          %>
     <OPTION value="<%= i%>"><%= dwglist.dwglist%></OPTION>
     <%
          %>
</SELECT></FORM>
<script language="JavaScript">
<!--
function gotoPage(varItem)
     window.location="/DrawingInquiry/DrawingInquiryServlet";
// -->
</script>
My Servlet Code:
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.ibm.drawinginquiry.rational.Drawing;
import com.ibm.drawinginquiry.rational.DrawingConnectionClass;
public class DrawingInquiryServlet extends HttpServlet implements Servlet {
     /* (non-Java-doc)
      * @see javax.servlet.http.HttpServlet#HttpServlet()
     public DrawingInquiryServlet() {
          super();
     public static String getFilePath;
     public static String getFilePath2;
     public static String getliteralErrString;
     public static String getErrMsg;
     public static String drawingString;
     public static String drawingRel;
     public static String drawingPend;
     public static String drawingTitle;
     public static String firstName;
     public static String lastName;
     /* (non-Java-doc)
      * @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest arg0, HttpServletResponse arg1)
     protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException {
          this.doPost(arg0, arg1);
     /* (non-Java-doc)
      * @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest arg0, HttpServletResponse arg1)
     protected void doPost(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException {
          String drawingnumber  = arg0.getParameter("dwgno");
          DrawingConnectionClass conn = new DrawingConnectionClass(drawingnumber);
          ErrorHandling getErrMsg = ErrorHandling.getErr(conn.errorString);
          //ErrorHandling getErrMsg = ErrorHandling.getErr(arg0.getParameter("dwgno"));
          getliteralErrString = conn.literalerrorString;
          HttpSession session = arg0.getSession(true);
          if (getliteralErrString.equals("NoError")){
               Drawing drawingString = Drawing.getDrawing(drawingnumber);
               Released drawingRel = Released.getRel(conn.released);
               Pending drawingPend = Pending.getPend(conn.pending);
               Title drawingTitle = Title.getTitle(conn.title);
               FirstName firstName = FirstName.getFname(conn.fname);
               LastName lastName = LastName.getLname(conn.lname);
               getFilePath = conn.filePath;
               getFilePath2 = conn.filePath2;
               session.setAttribute("errorBean", getErrMsg);
               session.setAttribute("dwgno", drawingString);
               session.setAttribute("dwgno1", drawingString);
               session.setAttribute("dwgrel", drawingRel);
               session.setAttribute("dwgpend", drawingPend);
               session.setAttribute("dwgtitle", drawingTitle);
               session.setAttribute("fname", firstName);
               session.setAttribute("lname", lastName);
          else{
               Drawing drawingString = Drawing.getDrawing("");
               Released drawingRel = Released.getRel("");
               Pending drawingPend = Pending.getPend("");
               Title drawingTitle = Title.getTitle("");
               FirstName firstName = FirstName.getFname("");
               LastName lastName = LastName.getLname("");
               getFilePath = "";
               getFilePath2 = "";
               session.setAttribute("errorBean", getErrMsg);
               session.setAttribute("dwgno", drawingString);
               session.setAttribute("dwgno1", drawingString);
               session.setAttribute("dwgrel", drawingRel);
               session.setAttribute("dwgpend", drawingPend);
               session.setAttribute("dwgtitle", drawingTitle);
               session.setAttribute("fname", firstName);
               session.setAttribute("lname", lastName);
          RequestDispatcher disp = getServletContext().getRequestDispatcher("/DrawingDisplay.jsp");
          disp.forward(arg0, arg1);