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From "Mei Zhu" <>
Subject RE: JavaScript / struts submit problems
Date Tue, 28 Jan 2003 17:06:21 GMT
In your jsp page, the hidden field should be:
<html:hidden property="xMLQueryString"/> The first character of the property
name should be lower case.


-----Original Message-----
From: []
Sent: Tuesday, January 28, 2003 10:49 AM
Subject: JavaScript / struts submit problems

Hello All,

I am having a little problem that hopefully someone can help me with.  I
have a form that has a hidden field in it, I am not populating this hidden
field on the page load but rather I am populating the value in a JavaScript
function and then using the form.submit() in JavaScript to submit the form.
When I try pulling the value for the hidden field out in my Action class I
get either a null pointer exception or a zero length string depending on
how I try to get the data.  I have verified that there is data populating
in the hidden fields value.  Here is the code below, if anyone can help me
in finding out how to get the value I would be very grateful.


<%@ page language ="java"%>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean"%>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic"%>
<title>Report Generator</title>
<LINK REL="stylesheet" TYPE="text/css" HREF="style/style.css">
<script LANGUAGE="JavaScript1.2" SRC="style/select.js"></script>
<script LANGUAGE="JavaScript1.2" SRC="style/report_generator.js"></script>
<script LANGUAGE="JavaScript1.2" SRC="style/dyn_select.js"></script>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<body bgcolor="#FFFFFF" text="#000000" leftmargin="0" topmargin="0">
<html:form action="Generator" name="generatorForm" type
<html:hidden property="XMLQueryString"/>
<table width = "100%" border = "0" cellpadding="0" cellspacing="0">
            <td align="left" valign="top">
                  <table width="197" border="0" height="103%" align="left"
valign="top" cellpadding="0" cellspacing="0">
                              <td height="90%" width="193" background
="images/bg_home_03.gif" >
                                    <table width="100%" border="0"
cellspacing="0" cellpadding="0">
                                                <td align="left">
<br><html:img src="images/load.gif" onmouseover="runtimeStyle.cursor
= 'hand'" onclick="runClick(document.generatorForm)"/> <br><br>
                                                <html:img onmouseover
="runtimeStyle.cursor = 'hand'" src="images/update.gif" onclick
="getHiddenValue(document.generatorForm)"/> <br> <br>
                                                <html:img onmouseover
="runtimeStyle.cursor = 'hand'" src="images/delete.gif"/> <br><br>
                                                <html:img onmouseover
="runtimeStyle.cursor = 'hand'" src="images/save.gif"/> <br><br>
                                                <html:text property
..... and so on.....


      function getHiddenValue(form)                          // added for
      function runClick(form)
            var strQueryXML = new String();

            if(form.selectedColumns.options.length > 0)
                  strQueryXML = getQueryXML(form);

                  form.XMLQueryString.value = strQueryXML;
                  alert(strQueryXML);                 // added for testing
                  alert(form.XMLQueryString.value);   // added for testing

                  alert("Please select at least one column.");

////Action Class/////

public class GeneratorAction  extends Action
  private ActionErrors errors = new ActionErrors();

  public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
      throws IOException, ServletException
    HttpSession session = request.getSession();
    String sXML = new String();
    String target = new String("failure");

    if(form != null)
      GeneratorForm gForm = (GeneratorForm)form;
        //sXML = gForm.getXMLQueryString();                 //0 length
        sXML = request.getAttribute("XMLQueryString").toString();
//null pointer
        //sXML = session.getAttribute("XMLQueryString").toString();
//null pointer
        System.out.println("XML String ="+sXML.toString());
        target = new String("success");
      catch(Exception e)
        System.out.println("Error Getting Attributes "+e);
        errors.add(ActionErrors.GLOBAL_ERROR, new ActionError
        target = new String("failure");


Tim Bachta
Information Technology
MC 48

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