Hi again,
In order to validate set of dropdowns in a datatable, I wrote a method to extract all components with a specific id (under that datatable), then scan the returned values in a loop an and make sure values are properly set. The method is activated in the save action. It seems like the drop down component properties: "value" and "submittedValue" are null. (The data is passed to the bean objects properly and saved to database, but when getting it directly from the component it returns a null value). Am I missing something? Thanks, Guy. From: Andrew Robinson [mailto:[EMAIL PROTECTED] Sent: Saturday, June 07, 2008 4:50 PM To: MyFaces Discussion Subject: Re: Datatable binding problem You are not understanding how JSF databinding works. I'll give you a brief overview, but I would strongly recommend that you stop development and read some articles on control binding before continuing. The binding happens at component construction time, not render time. If this does not click, then read my blog at http://andrewfacelets.blogspot.com. In your case, the binding happens when the component tree is built. Which means that the data table has no data, no var that is set, etc. A data table has only one set of components that are re-rendered for each value. There are not new components for each value. Think of it as a swing tree that has a node rendered that is called to render every node - there is only one. Sent from my iPod On Jun 7, 2008, at 2:53 AM, Guy Bashan <[EMAIL PROTECTED]> wrote: Hi All, I am having a little problem with datatable and binding. Here is the code: <t:dataTable id="dayParts" value="#{targetingParam.cmpTargetDayParts}" var="dayPart" cellpadding="0" cellspacing="0" rowIndexVar="rowIndex"> <t:column style="height:30px" rendered="#{!dayPart.deleted}"> <h:selectOneMenu value="#{dayPart.startHour}" onchange="updateTargetingActivity(#{rowIndexParam});" id="hourFrom" styleClass="mform" style="width:75px;" converter="ByteConverter"> <f:selectItems value="#{cmp_targeting.dayPartHoursFrom}"/> </h:selectOneMenu> <div> <h:message for="dayParts" errorClass="error_message" /> </div> </t:column> </t:dataTable> It works all fine, and I see a table with values on the screen. Now, when I add binding to the dropdown: binding="#{dayPart.htmlSelectOneMenuDaypartFrom}" I get the following exception: org.apache.jasper.el.JspPropertyNotFoundException: /cmp_targeting.jsp(593,12) '#{dayPart.htmlSelectOneMenuDaypartFrom}' Target Unreachable, identifier 'dayPart' resolved to null at org.apache.jasper.el.JspValueExpression.setValue(JspValueExpression.java:91) at org.apache.myfaces.application.ApplicationImpl.createComponent(ApplicationIm pl.java:315) at javax.faces.webapp.UIComponentELTag.createComponent(UIComponentELTag.java:91 ) at javax.faces.webapp.UIComponentClassicTagBase.findComponent(UIComponentClassi cTagBase.java:1101) at javax.faces.webapp.UIComponentClassicTagBase.doStartTag(UIComponentClassicTa gBase.java:431) at org.apache.jsp.cmp_005ftargeting_jsp._jspx_meth_h_005fselectOneMenu_005f1(cm p_005ftargeting_jsp.java:5394) at org.apache.jsp.cmp_005ftargeting_jsp._jspx_meth_t_005fcolumn_005f4(cmp_005ft argeting_jsp.java:5343) at org.apache.jsp.cmp_005ftargeting_jsp._jspx_meth_t_005fdataTable_005f3(cmp_00 5ftargeting_jsp.java:5290) at org.apache.jsp.cmp_005ftargeting_jsp._jspService(cmp_005ftargeting_jsp.java: 1042) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:3 93) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher. java:654) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDis patcher.java:445) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatch er.java:379) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher .java:292) at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(Servl etExternalContextImpl.java:338) at org.apache.myfaces.application.jsp.JspViewHandlerImpl.buildView(JspViewHandl erImpl.java:481) at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHand lerImpl.java:334) at org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseEx ecutor.java:41) at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:140) at org.apache.myfaces.custom.ppr.PPRLifecycleWrapper.render(PPRLifecycleWrapper .java:84) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:152) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:206) at com.todacell.ui.view.filter.OpenSessionInViewFilter.doFilterInternal(OpenSes sionInViewFilter.java:149) at com.todacell.ui.view.filter.OncePerRequestFilter.doFilter(OncePerRequestFilt er.java:61) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:206) at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter. java:147) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:175) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128 ) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102 ) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http 11Protocol.java:584) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619) In the bean I have the following code: private transient HtmlSelectOneMenu htmlSelectOneMenuDaypartFrom; public HtmlSelectOneMenu getHtmlSelectOneMenuDaypartFrom() { return htmlSelectOneMenuDaypartFrom; } public void setHtmlSelectOneMenuDaypartFrom(HtmlSelectOneMenu htmlSelectOneMenuDaypartFrom) { this.htmlSelectOneMenuDaypartFrom = htmlSelectOneMenuDaypartFrom; } i:embed'> { this.htmlSelectOneMenuDaypartFrom = htmlSelectOneMenuDaypartFrom; }
