Lists work, but you have to write your own set(int index) method to set the
correct object from the List.
BAL
From: "Jim Barrows" <[EMAIL PROTECTED]>
To: "Struts Users Mailing List"
<[EMAIL PROTECTED]>,<[EMAIL PROTECTED]>
Subject: RE: Read only iterate?
Date: Fri, 13 Aug 2004 09:40:27 -0700
> -----Original Message-----
> From: Mike Elliott [mailto:[EMAIL PROTECTED]
> Sent: Friday, August 13, 2004 9:33 AM
> To: [EMAIL PROTECTED]
> Subject: Read only iterate?
>
>
> 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:
from
http://struts.apache.org/userGuide/struts-html.html#text
I'm guessing that a List won't work and you need to have an array.
>
> ---------------------------------------------------------
> [ 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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