I've been totally defeated in my attempt to alter an html:text
element inside a logic:iterate tag. There must be a way to
accomplish this, but I've been beating my head against the wall
for three days now without making progress.
I have simplified the problem substantially from the initial page.
What I have now looks like this:
---------------------------------------------------------
[ Submit ]
Problematic Input [0 ]
Problematic Input [1 ]
Functioning Input [A Value ]
---------------------------------------------------------
The lines containing "Problematic Input" were generated by a
logic:iterate tag, which successfully fetched the list of objects from
the form bean. The last line, containing "Functioning Input", was
generated outside of the logic:iterate tag. Actual contents of the
jsp page, bean, etc., are attached.
What happens at runtime is that when the JSP page is rendered, the
text fields for all three rows are successfully and correctly fetched
from the form bean, but only the last row can be changed. As the log
shows:
<start>
INFO [org.apache.struts.util.PropertyMessageResources] Initializing,
config='org.apache.struts.taglib.html.LocalStrings', returnNull=true
INFO [problem.ProblemBean] initializing entries
INFO [problem.ProblemBean$ProblemItem] setInteger_value to 0
INFO [problem.ProblemBean$ProblemItem] setInteger_value to 1
INFO [problem.ProblemAction] show
INFO [org.apache.struts.util.PropertyMessageResources] Initializing,
config='org.apache.struts.taglib.logic.LocalStrings', returnNull=true
INFO [problem.ProblemBean] getEntries
INFO [problem.ProblemBean$ProblemItem] getInteger_value
INFO [problem.ProblemBean$ProblemItem] getInteger_value
INFO [problem.ProblemBean] getWorking_perfectly
<submit>
INFO [problem.ProblemBean] setWorking_perfectly to 'mutated'
INFO [problem.ProblemAction] update
INFO [problem.ProblemBean] getEntries
INFO [problem.ProblemBean$ProblemItem] getInteger_value
INFO [problem.ProblemBean$ProblemItem] getInteger_value
INFO [problem.ProblemBean] getWorking_perfectly
The page is initialized properly. All three values are fetched from
the form bean via the expected get methods. The html form is properly
populated and displays the expected values (0, 1, and "A Value").
The three fields are then changed (to 5, 5, and "mutated") and the
submit button is selected at the point in the log file where I have
inserted the <submit> annotation.
This causes the form to be submitted to the Action, causing the set
method for the field "working_perfectly" to be invoked (as it should
be), but the set method for the two fields in the logic:iterate tag is
not invoked. And I don't know why. And I can't seem to get them to
be invoked, either.
So . . . the magic isn't working. Something must be needed to tell
the generated servlet not to treat these two properties (inside the
logic:iterate tag) as read-only. What should it be? How can I get
these properties to be updated in the form bean as the
"working_perfectly" property is?
Like I said -- I've been beating my head against this problem for
three days now. There's just got to be a way!
----------------------------------------------------------------------
struts-config.xml
----------------------------------------------------------------------
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.0//EN"
"http://jakarta.apache.org/struts/dtds/struts-config_1_0.dtd";>
<struts-config>
<form-beans>
<form-bean
name="problemBean"
type="problem.ProblemBean"/>
</form-beans>
<action-mappings>
<action
path="/problemPage"
type="problem.ProblemAction"
name="problemBean"
validate="false"
input="/pages/problem.jsp"/>
</action-mappings>
</struts-config>
----------------------------------------------------------------------
problem.jsp:
----------------------------------------------------------------------
<%@ taglib uri="/taglib/struts-logic" prefix="logic" %>
<%@ taglib uri="/taglib/struts-html" prefix="html" %>
<html>
<head>
<title>Problem page</title>
</head>
<body>
<div style="text-align: center">
<html:form action="/classicResultPage.do?arg=update" method="post">
<table summary="x" width="800" border="0" cellspacing="0"
cellpadding="0">
<tr>
<td align="center" colspan="2">
<html:submit/>
</td>
</tr>
<hr />
<logic:iterate id="entry" name="problemBean" property="items" >
<tr>
<td>Problematic input</td>
<td>
<html:text name="entry"
property="integer_value" indexed="true"/>
</td>
</tr>
</logic:iterate>
<tr>
<td><b>Functioning input</b></td>
<td>
<html:text property="someValue"/>
</td>
</tr>
</table>
</html:form>
<hr />
</div>
</body>
</html>
----------------------------------------------------------------------
ProblemAction.java
----------------------------------------------------------------------
package problem;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.Action;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public final class ProblemAction extends Action {
public ActionForward execute( ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response ) {
String arg = request.getParameter( "arg" );
if ("update".equals( arg )) {
log.info( "update" );
}
if ("show".equals( arg )) {
log.info( "show" );
}
return new ActionForward( mapping.getInput() );
}
private static Logger log;
static {
log = Logger.getLogger( ProblemAction.class );
log.setLevel( Level.DEBUG );
}
}
----------------------------------------------------------------------
ProblemBean.java
----------------------------------------------------------------------
package problem;
import java.util.List;
import java.util.ArrayList;
import org.apache.log4j.Logger;
import org.apache.log4j.Level;
import org.apache.struts.action.ActionForm;
public class ProblemBean extends ActionForm {
String someValue = "***";
public String getSomeValue() {
log.info( "getSomeValue" );
return someValue;
}
public void setSomeValue( String someValue ) {
log.info( "setSomeValue to '" + someValue + "'");
this.someValue = someValue;
}
private static Integer incrementing = new Integer( 0 );
public static class ProblemItem {
public ProblemItem() {
this.integer_value = incrementing;
incrementing = new Integer( incrementing.intValue() + 1 );
}
private Integer integer_value;
public Integer getInteger_value() {
log.info( "getInteger_value" );
return integer_value;
}
public void setInteger_value( Integer iValue ) {
log.info( "setInteger_value to " + iValue );
this.integer_value = iValue;
}
private static Logger log;
static {
log = Logger.getLogger( ProblemItem.class );
log.setLevel( Level.DEBUG );
}
}
private List items;
public List getItems() {
if (items == null) {
log.info( "initializing items" );
items = new ArrayList( 2 );
items.add( new ProblemItem() );
items.add( new ProblemItem() );
}
log.info( "getItems" );
return items;
}
public void setItems( List items ) {
log.info( "setItems" );
this.items = items;
}
private static Logger log;
static {
log = Logger.getLogger( ProblemBean.class );
log.setLevel( Level.DEBUG );
}
}
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