CommandButton's rendered attribute doesn't work inside dataTable
Hi,
I don't know if anyone could help me...
I need to access a list of "alarms" in my jsp file (which is rendered by "alarmHandler.sortedGenericDataModel"). For each "alarm" of the list, I test the "alarm.alarmStatus" and I want to create the desired button depending on the it. I'm trying to use the "rendered" attribute to manage the fact the button will be created or not. Note that when I use the "disabled" attribute, everything works fine, but I don't want to use the disabling option, I prefer to don't show the button at all.
I have a NullPointerException when I run this code (the stack trace of this exception is show at the buttom of this message):
<h:dataTable value="#{alarmHandler.sortedGenericDataModel}" var="alarm"
rows="#{alarmHandler.noOfRows}"
first="#{alarmHandler.firstRowIndex}"
styleClass="tablebg" rowClasses="oddRow, evenRow"
columnClasses="left, left, left, right, left" width="100%">
<h:column>
<f:facet name="header">
<h:outputText value="#{labels['alarm.label.action']}" />
</f:facet>
<h:commandButton value="#{labels['alarm.label.toActivate']}"
rendered="#{alarm.alarmStatus != '3'}"
action="#{alarmHandler.activate}" immediate="true" />
<h:commandButton value="#{labels['alarm.label.toAcknowledge']}"
disabled="#{alarm.alarmStatus != '1'}"
action="#{alarmHandler.acknowledge}" immediate="true" />
<h:commandButton value="#{labels['alarm.label.toClose']}"
disabled="#{alarm.alarmStatus != '2'}"
action="#{alarmHandler.close}" immediate="true" />
</h:column>
</h:dataTable>
*** Here is the stack trace of the error:
2004-08-30 11:33:13,902 13307343 ERROR [org.jboss.web.localhost.Engine] (http-0.0.0.0-8643-Processor5:) ApplicationDispatcher[abox] Servlet.service() for servlet jsp threw exception
javax.faces.el.EvaluationException: java.lang.NullPointerException
at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:206)
at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:154)
at javax.faces.component.UIComponentBase.isRendered(UIComponentBase.java:307)
at javax.faces.webapp.UIComponentTag.isSuppressed(UIComponentTag.java:838)
at javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:470)
at com.sun.faces.taglib.html_basic.CommandButtonTag.doStartTag(CommandButtonTag.java:469)
at org.apache.jsp.JSP.alarm.viewAlarmsTemplate_jsp._jspx_meth_h_commandButton_0(viewAlarmsTemplate_jsp.java:588)
at org.apache.jsp.JSP.alarm.viewAlarmsTemplate_jsp._jspx_meth_h_column_1(viewAlarmsTemplate_jsp.java:505)
at org.apache.jsp.JSP.alarm.viewAlarmsTemplate_jsp._jspx_meth_h_dataTable_1(viewAlarmsTemplate_jsp.java:445)
at org.apache.jsp.JSP.alarm.viewAlarmsTemplate_jsp._jspx_meth_h_form_0(viewAlarmsTemplate_jsp.java:202)
at org.apache.jsp.JSP.alarm.viewAlarmsTemplate_jsp._jspService(viewAlarmsTemplate_jsp.java:125)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:703)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:589)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)
at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:581)
at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:137)
at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:177)
at org.apache.struts.taglib.tiles.InsertTag.doInclude(InsertTag.java:756)
at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:881)
at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:473)
at org.apache.jsp.JSP.generic.template_jsp._jspx_meth_tiles_insert_3(template_jsp.java:382)
at org.apache.jsp.JSP.generic.template_jsp._jspx_meth_f_subview_3(template_jsp.java:346)
at org.apache.jsp.JSP.generic.template_jsp._jspx_meth_f_view_0(template_jsp.java:146)
at org.apache.jsp.JSP.generic.template_jsp._jspService(template_jsp.java:80)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:703)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:589)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)
at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:581)
at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:137)
at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:177)
at org.apache.struts.taglib.tiles.InsertTag.doInclude(InsertTag.java:756)
at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:881)
at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:473)
at org.apache.jsp.JSP.alarm.viewAlarmsLayout_jsp._jspx_meth_tiles_insert_0(viewAlarmsLayout_jsp.java:100)
at org.apache.jsp.JSP.alarm.viewAlarmsLayout_jsp._jspService(viewAlarmsLayout_jsp.java:74)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:703)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)
at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:147)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:703)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)
at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:147)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
at org.apache.struts.faces.application.FacesTilesRequestProcessor.doForward(FacesTilesRequestProcessor.java:144)
at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:455)
at org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:320)
at org.apache.struts.faces.application.FacesTilesRequestProcessor.processForwardConfig(FacesTilesRequestProcessor.java:260)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at com.thevco.abox.web.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:166)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:72)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.jboss.web.tomcat.security.JBossSecurityMgrRealm.invoke(JBossSecurityMgrRealm.java:275)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.NullPointerException
at org.apache.struts.faces.application.PropertyResolverImpl.getValue(PropertyResolverImpl.java:146)
at com.sun.faces.el.impl.ArraySuffix.evaluate(ArraySuffix.java:167)
at com.sun.faces.el.impl.ComplexValue.evaluate(ComplexValue.java:151)
at com.sun.faces.el.impl.BinaryOperatorExpression.evaluate(BinaryOperatorExpression.java:165)
at com.sun.faces.el.impl.ExpressionEvaluatorImpl.evaluate(ExpressionEvaluatorImpl.java:243)
at com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:173)
mleblanc77:
Thanks for your interest.
I've modified one of our internal demos to try to reproduce your problem
and cannot do so. Here is the operative JSP:
<!-- ... -->
<h:dataTable binding="#{UIDataBean.data}"
value="#{list}"
var="customer">
<h:column>
<h:commandButton id="press"
action="#{UIDataBean.press}"
rendered="#{customer.accountId != '123456'}"
immediate="true"
value="#{UIDataBean.pressLabel}"
type="SUBMIT"/>
</h:column>
</h:dataTable>
<!-- ... -->
Here's the customer bean
public class CustomerBean implements Serializable {
public CustomerBean() {
this(null, null, null, 0.0);
public CustomerBean(String accountId, String name,
String symbol, double totalSales) {
System.out.println("Created CustomerBean");
this.accountId = accountId;
this.name = name;
this.symbol = symbol;
this.totalSales = totalSales;
private String accountId = null;
public String getAccountId() {
return (this.accountId);
This seems to work fine. Can you try the latest weekly build from
https://javaserverfaces.dev.java.net/servlets/ProjectDocumentList
Thanks,
Ed (JSF Co-spec lead)
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I've used the following styles :
<style type="text/css">
/* <![CDATA[ */
body {
margin:0; padding:0;
font-size:80%;
font-family: sans-serif;
#header {
display: block;
width: 80%;
margin: auto;
#container {
width: 80%;
margin: auto;
padding:0;
display: table;
border: 1px solid black;
#row {
display: table-row;
#left {
width:150px;
padding:1em;
background: #EEF;
display: table-cell;
#right {
width:150px;
padding:1em;
background:#FEE;
display: table-cell;
#middle {
padding: 1em;
background:yellow;
display: table-cell;
/* ]]> */
</style>
Hope it helps!
Cheers,
pedro
Edited by: plopes on May 11, 2009 2:46 PM
Edited by: plopes on May 11, 2009 4:40 PM -
I've got a new MacBook Pro Retina from october 2013 13" (8 gb Ram and 256 gb SSD).
I had the "freezing" issue that was solved with the firmware EDI update.
But after this update i have now another problem: often during web browsing the scroll with 2 fingers up and down the page stops working (but the trackpad is ok for everything else and if i go in other programs the scroll works as usual). The only solution is to restart the browser but the problem happens again and again.
Both on Chrome and Safari. Especially on Safari everything freeze if i try to scroll on the right to go back to the previous page.
Does anybody else have this issue?macmattia wrote:
I've got a new MacBook Pro Retina from october 2013
Does anybody else have this issue?
Doesn't matter if anybody else has this issue.
You are still under warranty. Call Apple Care. Make sure you get a case number as all repairs have an additional 90 days of warranty.
#1 - You have 14 days from the date of purchase to return your computer with no questions asked.
#2 - You have 90 days of FREE phone tech support.
#3 - You have the standard one year Apple warranty.
#4 - If you've purchased an AppleCare Protection Plan, your warranty last for 3 years. You can obtain AppleCare anytime up to the first year of the purchase of your computer.
Take FULL advantage of your warranty. Posting on a message board should be done as a last resort and if you are out of warranty or Apple Care has expired. -
Link action (CommandLink): target attribute doesn't work
I want to use a link action to pop up another JSF page, so I set its target attribute to _blank, and in its event handler, I return the other jsf page. However, the other jsf page doesn't open in a new window, it just replaces the current page in the existing window. Why?
Hi,
The way to open a new window is to make use of the javascript function window.open. This can be used on click event for the hyperlink action. The link action does not allow the usage of the above mentioned method.
Thanks,
RK -
Copy and Paste doesn't work inside compound clips
If I have two compound clips, when I try to copy some clips from inside one, then open the other compound clip and paste, nothing happens.
However, if I try the same on a project timeline paste works.
This is really annoying as I cannot move a clip from one scene to another when I have set up my scenes as compound clips.They were created in 10.0.8.
Are you definitely going into two separate compound clips?
For example, If I explode one of the compound clips on a timeline then paste works again. That still means I need separate projects for each scene which is a pain.
What I would like in FCP X, is to be able to have more than one timeline open simulataneously, so I can drag relevant clips between them. I am finding with a documentary that I am editing, where the story is not obvious and scripted in advance, that developing story idea sections as compound clips is really incovenient. I often realise that clips there were in one section work better in another. This was much easier in FCP 7 where you can open two timelines and drag between them.
I hope apple add the ability to open multiple timelines. -
Rendering Previews doesn't work
I'm trying to render standard previews for my catalogue but it just hangs on 1 of 8810, it worked before I reinstalled my OS, I have tried a new catalogue and tried deleting the prefs file but it's still the same, do I need to install an older version of LR first before installing the latest for this to work?
It works on the other machine that uses the same catalogue file.I believe (don't use windows myself) on XP you need some sort of RAW extension from Microsoft installed to see the previews for RAW files from many cameras. Others probably know more about this.
A quick google shows this. That might be it but it appears old (as XP is of course) -
I have a CommandButton with rendered attribute to display it depend of the step in a bussines process.
The JSF Page have a request scope then all flags need to be recalculate each request (The page is reloaded severla times to complete the process, the actions return null).
Well, my problem is that when I render the Commandbutton and make click on it the form be submitted but the action never be executed.
I think the problem is that when the request be processed maybe the flags to render the button be fasle and the actionevent never be queue.
Anybody have idea ?
Some suggest to resolve this problems.
Thank you in advanced.loboEsa wrote:
I have a CommandButton with rendered attribute to display it depend of the step in a bussines process.
The JSF Page have a request scope then all flags need to be recalculate each request (The page is reloaded severla times to complete the process, the actions return null).
Well, my problem is that when I render the Commandbutton and make click on it the form be submitted but the action never be executed.
I think the problem is that when the request be processed maybe the flags to render the button be fasle and the actionevent never be queue.
This is exactly right. Some options include:
1) Storing the rendered attribute value in the session instead of the request.
2) Making the rendered attribute depend on a request parameter which can be added as a hidden input. -
Cfdocument doesn't work with my font size
Hi All,
My font size doesn't work inside my cfdocument using css
Here is my code:
In My css file I have this:
body { font-family:"times new roman"; font-size: 18px; line-height: 20px; }
The font is a TTF and it shows in my cfadmin as:
Font Family Font Face Postscript Name Font Type Useable In Path
times new roman
Times New Roman
TimesNewRomanPSMT
TRUETYPE
PDF/FlashPaper
c:\windows\fonts\times.ttf
I try using postscript name and the same issue. If I increase the font size it actually reduce the size on the screen.
I'm using windows 2008 with CF8 with the latest hotfix 8,0,1,195765
Any ideas?
Thanks in advance.
JohnnyDon't know why didn't show my code.
Here is the code:
<cfdocument format="flashpaper" pagetype="letter" fontembed="yes" margintop="0.3" marginbottom="1.25" marginleft="1" marginright="1.25" unit="in">
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" >
<head>
<style type="text/css" media="screen">
@import url(assets/css/preview.css);
</style>
</head> -
CommandButton with conditional-rendered doesn't work???
Hi,
My problem:
I just would like to show the Submit-Button (commandButton) after I change the value of the "selectOneMenu ". So for that I set the boolean variable for the rednerer to true. After that the Submit-Button is shown. But when I click on that Submit-Button, the action is not invoked?
But when I remove the "rendered="#{bean.rendered}" attribute from the commandButton, the action is invoke!
What do I wrong?
Would be great if someone could help me!
<h:form id="choose2">
<h:panelGrid columns="2" rowClasses="panelChooseRow" columnClasses="panelChooseCol">
<h:outputText value="#{msgs.beanUserName}" />
<h:panelGroup>
<h:selectOneMenu id="userMenu" value="#{bean.userName}" onchange="submit()" required="true">
<f:selectItems id="userItems" binding="#{bean.userItems}" />
</h:selectOneMenu>
<h:message for="userMenu" errorClass="errMsg" />
</h:panelGroup>
<h:outputText value="" rendered="#{bean.rendered}"/>
<h:commandButton id="send" value="#{msgs.beanSave}" action="#{bean.actionModify}" rendered="#{bean.rendered}"/>
</h:panelGrid>
</h:form>
Bean-Code:
public void setUserName( String newValue )
_userName = newValue;
_bRendered = true;
public String actionModify()
System.out.println("actionModify");
return null;
public boolean isRendered()
return _bRendered;
}Hi,
well, I don't see what could be wrong in your code, but I have an example working.
So I will just post my code and you can compare.
Some code snipped off my JSF Site:
<h:commandButton id="upload" rendered="#{uploadFileBean.check}" onclick="submit()" action="#{uploadFileBean.upload}" value="#{messages.upload}" styleClass="bgTextBright" tabindex="4"/>
<h:commandButton id="correct" rendered="#{not uploadFileBean.check}" onclick="submit()" action="#{uploadFileBean.correct}" value="#{messages.correct}" styleClass="bgTextBright" tabindex="4"/>Here the code in my uploadFileBean:
private boolean check;
public boolean isCheck()
return check;
public void setCheck(boolean b)
this.check = b;
public String upload()
String retVal = Constants.UPLOAD_OK;
return retVal;
public String correct()
String retVal = Constants.CORRECT_OK;
return retVal;
}There is only one commandButton shown (depending on my check property) and if I press it, the associated action method is called.
Did you have a look, if you call the right method? Meaning, does the method exist in the given bean? Do you have your bean declared in the faces-config.xml?
As I can tell you, the posted code works fine, so hope this could help you. -
CommandLink doesn't work with rendered-attribute
Hello,
I have quite a strange problem.
I have a commanLink, which has a rendered attribute. The link is rendered conditionally, so the rendered-value comes from a bean.
<h:commandLink rendered="#{Bean.canEdit}" action="#{Bean.selectDocumentToEdit}" >
<h:outputText value="Edit doc" />
<f:param name="param" value="#{Bean.doc.id}"/>
</h:commandLink>Showing the link is working like it should, but commandLink is not working with this. When I change rendered="true", commandLink works ok. But now it doesn't call the commandLink action at all.
Any help would be appreciatedrendered="true", commandLink works ok. But now it
doesn't call the commandLink action at all.I meant it doesn't call the commandLink action method when retrieving rendered-value from bean.
I'm using RI 1.1.01 -
Rendered attribute of commandButton preventing action method from executing
When I add a rendered tag to my commandButton it'll only execute the method intermittantly. After a lot of testing, I've narrowed down the problem so I now know when it does and does not work properly.
If rendered="true" it always works fine
If rendered="#{issue.update}" and isUpdate() is simply "return true;" it'll always work correctly
If rendered="#{issue.update}" and isUpdate() is simply "return this.getId() != 0;" it will not execute the action specifiied, however the page does refresh.
It's also interesting to note that on the rendered page, the button is always shown only when it should be. So when the action fails to execute, the button is shown on the screen.
In the case that doesn't work, I debugged through and noticed that isUpdate() is called six times for a single page refresh. By printing a stacktrace for each call, I discovered that it's called once in the ApplyRequestValues stage of the lifecycle and the other five times are from RenderResponse (I have the stacktraces, let me know if they'd be worth posting). This method is only referenced once and only on the jsf page, never in the java code... but I'll go back and try to understand why it's calling it so many times later.
The first time isUpdate() is called, it will retrun false because the value for id has not yet been assigned, which makes sense. This causes a "false" to be returned from isUpdate() and this is what is causing the action to not be executed. If I debug through and change the return value to be true here (only the first time) the action is updated. So my question is, what's going on here? I don't understand why is isUpdate() called so many times, why is it called so early in the lifecycle, and why the call in the apply request values stage determines whether or not it executes the action?
Now, as a workaround, I put a binding on the id, and tried to use that value. That exposed another problem with my page which requires some explanation... Here are the relevent sections of the page and backing bean...
issue.jsp
<h:outputText value="#{issue.init}" />
there's a datatable here which displays all issues and has a commandLink to edit the issues (immediate="true"). It posts back to this page and passes an ID on the URL.
<h:inputHidden id="id" value="#{issue.id}" binding="#{issue.idBinding}" />
<h:inputText id="name" value="#{issue.name}" required="true" />
<h:commandButton id="updateIssue" value="Update" action="#{issue.updateIssue}" rendered="#{issue.update}" />
Issue.java
getInit() will get the id from the FacesContext (specifically, the URL) and load the data from the database.
On the rendered page in my web browser:
After clicking on an edit link, the page is loaded and the name is filled in, the update button is on the screen, and everything looks good.
When I view source, I see that the hidden input for id is set to zero. I'm still trying to figure out why this is the case since all the other parameters are set properly. I stepped through getInit() and it is, indeed setting the id property properly.
So when I added the binding to get the value from there instead of via the local values, I found that it always got zero (presumedly because that's what is rendered in the HTML code). This means that isUpdate() still returns false on the first call, and my attempt at a workaround fails! So, just as a test, I used some "javascript on the URL" trickory to set the id field to "10". That worked just fine. So the root of the problem is that issue.id is not loading. I put code in the getId() method to always look at the binding and then faces context and put the id into this.id if it found a non-null and non-zero value. It now returns the correct value all of the time but the HTML produced still says the value is zero.
I've spent about 4 hours on this issue and I'm to the point where I need advice from someone who is more educated on how JSF works. I know the inputHidden get the vaule for the HTML tag it produces from getId() because when I hard code that to always return 10, it works. But when I leave it to return the proper value, the debug statements say it's returning the proper value, but the HTML always says it's zero. This isn't an acceptable solution anyway because I use getId() in the datatable to display the IDs of each of the issues; I just wanted to see if it'd work and it didn't.
Here's my latest getInit() method (which returns the value from the URL when called from the datatable, but not when called from the inputHidden.
public int getId() {
if(getIdBinding() != null && !getIdBinding().isLocalValueSet()) {
if(getIdBinding().getSubmittedValue() != null) {
int temp = Integer.parseInt((String)getIdBinding().getSubmittedValue());
if(temp != 0) {
this.id = temp;
log.info("Got binding value of "+this.id);
FacesContext ctx = FacesContext.getCurrentInstance();
if(ctx != null) {
Map<String, String> map = ctx.getExternalContext().getRequestParameterMap();
if(map != null) {
String given_id = map.get("id");
if(given_id != null) {
// if given an ID and no action, we load the data
try {
log.info("Got value from FacesContext of "+given_id);
int temp = Integer.parseInt(given_id);
if(temp != 0)
this.id = temp;
} catch(NumberFormatException e) {
// if what's passed in isn't an integer, we leave everything at default values
return this.id;
}Thanks in advance,
AdamI'm clicking a link which will load data into a form. In the form there is a field called "id" which has a value of something other than zero. I press the update button (which is only rendered when the id is non-zero), it submits the form. When the restore view happens, the id is the default value of 0 because it has not yet applied the values from the form to the backing bean. Therefore the rendered attribute of update button (isUpdate()) will return false, and the update() method does not get queued.
When I switch my backing bean to session level, the restore view already has the id loaded, even before the values from the form are applied, so everything works as expected. The problem was that I needed to have the correct return values before any values have been loaded into the member variables.
As a solution to this, I made some private boolean variables called isNew and isUpdate. Both of them are true by default. This makes sure that the isNew() and isUpdate() methods (attached to the render attribute of my command buttons) return true in the restore view phase. When I read in the id from the URL or hidden input, it'll update the boolean values accordingly, which makes sure the buttons are rendered properly. This allowed me to set the backing bean back to the request scope, which make me happy. <img class="emoticon" src="images/emoticons/grin.gif" border="0" alt="" />
Thank you Mr. De Campo. You gave me exactly what I was looking for... a better understanding of how thigns work, and (indirectly) a clean solution to my problem.
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