[JSP] How to use a form taken from another JSP?

Alhazred · #1 (**permalink**) 07-28-2008, 04:34 PM

I have a JSP (JSP1) with 3 forms:
1st) is part of the jsp and works correctly
2nd) is part of the jsp and sends a request to an external JSP (JSP2)
3rd) JSP2 is included inside JSP1

JSP2 receives a character from the 2nd form (radio buttons with a character associated) and performs a query on a DB searching items with that character as initial (the query works correctlly), the result of the query is a form which contains a table included in JSP1.
I insert some values in the text fields of this included form, click the submit button and the servlet does its work updating the DB with the new values.
After the update the servlet reloads JSP1. Everything correct till this point.
The problem is, if now I click on a radio button Tomcat returns an error:

HTTP Status 500 -

type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NumberFormatException: null
java.lang.Integer.parseInt(Unknown Source)
java.lang.Integer.parseInt(Unknown Source)
frontend.ModificaRimanenza.doPost(ModificaRimanenz a.java:30)
javax.servlet.http.HttpServlet.service(HttpServlet .java:710)

javax.servlet.http.HttpServlet.service(HttpServlet .java:803)

When I click on the radio button things go as I also click the submit button in the included form and a null value is sent to the servlet ModificaRimanenza, which is associated to the external form, not to the radio buttons form.

Why this happens?

JSP1 code

HTML Code:

<%@ page language="java" contentType="text/html; charset=iso-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ page import="controller.MagController" %>
<%!
static final String[][] TABS = {
    {"A","showingrediente.jsp"},
    {"B","showingrediente.jsp"},
    {"C","showingrediente.jsp"}
<!-- and so on till Z -->
    };%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Modifica soglia</title>
<% int soglia_scadenza = MagController.getSoglia(); %>

<SCRIPT LANGUAGE="JavaScript">
<!--
function checkSogliaScadenza(obj) {
    //permette solo numeri   
    scadenza = obj.value.replace(/\D/g,"");
    obj.value = scadenza;
}
function checkFormScadenza(obj) {
    if(document.modsoglia.scadenza.value <= 0) {
        alert("La soglia di scadenza deve essere un intero maggiore di 1");
        document.modsoglia.scadenza.value = "";
        document.modsoglia.scadenza.focus();
        return false;
    }

    return true;
}
//-->
</script>
</head>
<body>
<center>
<h2>Modifica valori di soglia</h2>
<br><br>
Modifica soglia di scadenza
<form name="modsoglia" action="ModificaScadenza" method="post">
<table width="300" border="0" cellpadding="6">
    <tr>
        <td width="65%">Soglia per date di scadenza</td>
        <td width="35%"> <%= soglia_scadenza %> giorni</td>
    </tr>
    <tr>
        <td>Nuovo valore di soglia</td>
        <td><input type="text" name="scadenza" size="3" onChange="checkSogliaScadenza(this)" /> giorni</td>
    </tr>
    <tr>
        <td><%if (session.getAttribute("esito_scadenza") != null)
                if (session.getAttribute("esito_scadenza").equals("non_modificata")) {%>
                    <font color="red">Soglia non modificata!</font> <% } %></td>
        <td><input type="submit" name="modsoglia" value="Modifica" onClick="return checkFormScadenza(this)"/></td>
    </tr>
</table>
</form>
<br><br><br>
Modifica soglia rimanenze<br>
<form action="" method="post">
<%String which = request.getParameter("which");
  if (which==null)
      which = TABS[0][0];
  String jspToRun = null;
  for (int i=0; i<TABS.length; i++) {
      String tabLabel = TABS[i][0];
      String tabJSP = TABS[i][1];
      String CHECKED = "";
      if (which.equals(tabLabel)) {
          CHECKED = "CHECKED";
          jspToRun = tabJSP;
      }
%>
<input name="which" type="radio" value="<%=tabLabel %>" <%= CHECKED %> onClick="this.form.submit()" /><%= tabLabel %>
&nbsp;
<%
    if (i==12) {%>
        <br>
<%    }
} %>
</form>
<jsp:include page="<%= jspToRun %>" flush="true" />

<br><br><br><br>
<a href="hpmagazziniere.html">Home page</a>
</center>
</body>
</html>

JSP2 code (showingrediente.jsp)

HTML Code:

<%@ page import="controller.IngrController" %>
<%@ page import="java.sql.*" %>
<SCRIPT LANGUAGE="JavaScript">
<!--
function selezionato(obj) {
    //permette solo numeri   
    nuovaSoglia = obj.value.replace(/\D/g,"");
    obj.value = nuovaSoglia;
   
    if(obj.value > 0)
        document.modrimanenza.totale_selezionati.value = parseInt(document.modrimanenza.totale_selezionati.value) + 1;
    if(obj.value <= 0)
        document.modrimanenza.totale_selezionati.value = parseInt(document.modrimanenza.totale_selezionati.value) - 1;
}

function checkForm() {
    if (document.modrimanenza.totale_selezionati.value == 0)
        return false;
    else
        return true;
}

//-->
</script>
<%
    int i=0;
    String lettera = request.getParameter("which");
    ResultSet rs = IngrController.getIngrMagPerLettera(lettera);
%>

<center>
<form name="modrimanenza" action="ModificaRimanenza" method="post">
<table width="550" cellpadding="2">
    <tr>
        <td width="25%"><b>Ingrediente</b></td>
        <td width="20%"><b>Unit&agrave; di misura </b></td>
        <td width="25%"><div align=center><b>Soglia attuale </b></div></td>
        <td width="30%"><b>Nuovo valore di soglia </b></td>
    </tr>
    <% while (rs.next()) { %>
    <tr>
        <td><%=rs.getString("Nome") %></td>
        <td><div align="center"><%=rs.getString("unitaDiMisura") %></div></td>
        <td><div align="center"><%=rs.getString("Soglia") %></div></td>
        <td><div align="center"><input type="text" name="ingrediente<%= i %>value" size="3" value="0" onChange="selezionato(this)"/></div>
            <input type="hidden" name="ingrediente<%= i %>name" value="<%=rs.getString("Nome") %>" /></td>
    </tr>
    <% i++;
    } %>
    <tr>
        <td>&nbsp;</td>
        <td>&nbsp;</td>
        <td><input type="hidden" name="totale_selezionati" value="0"/>&nbsp;</td>
        <td><div align="center"><input type="submit" name="modifica" value="Modifica" onClick="return checkForm()"/></div></td>
    </tr>
</table>
</form>
</center>

doPost method ModificaRimanenza associated to JSP2

PHP Code:


			
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        int daModificare = Integer.parseInt(request.getParameter("totale_selezionati")); //number of items with quantity > 0

        int j = 0; //counts items with quantity > 0 found

        int aux = 0; //loops thru the items inside the form received

       

        String[][] ingrediente = new String[daModificare][2];

       

        while (j < daModificare) { //while the number of item with quantity > 0 found is less than the known number

            if(Integer.parseInt(request.getParameter("ingrediente"+aux+"value")) > 0) {

                ingrediente[j][0] = request.getParameter("ingrediente"+aux+"name");

                ingrediente[j][1] = request.getParameter("ingrediente"+aux+"value");

                j++;

                aux++;

            }

            else

                aux++;

        }



        IngrController.modificaSogliaRimanenza(ingrediente,daModificare);

       

        RequestDispatcher dispatcher = request.getRequestDispatcher("/modificasoglia.jsp");

        dispatcher.forward(request, response);

    }

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