Updating a dynamic generated selectOneMenu - jsf-2

Question

In my web app i have the following DataTable:
<!-- Exibição da lista de públicos -->
<p:dataTable id="dtEventos"
value="#{relatoriosBean.listaEventos}"
paginator="true" rows="5"
rowsPerPageTemplate="5,10"
paginatorPosition="bottom"
paginatorTemplate="{FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}"
var="atual"
emptyMessage="Não há eventos para exibição"
rendered="#{relatoriosBean.exibirPainelDados}">
<f:facet name="header">
Eventos
</f:facet>
<p:column sortBy="#{atual.nmeEvento}" styleClass="wrap">
<f:facet name="header">
Nome
</f:facet>
<p:panelGrid columns="1"
styleClass="gridNoLine">
<h:outputLabel id="olViewNomeEvento"
value="#{atual.nmeEvento}"
styleClass="t2"/>
<p:separator title="Descrição do evento"/>
<p:row>
<h:outputLabel value="Início: " styleClass="t2"/>
<h:outputLabel value="#{atual.dtaInicioEvento}"/>
<h:outputLabel value="Término: " styleClass="t2"/>
<h:outputLabel value="#{atual.dtaTerminoEvento}"/>
</p:row>
<h:outputLabel value="#{atual.dscEvento}"
styleClass="wrap"/>
</p:panelGrid>
</p:column>
<p:column>
<f:facet name="header">
Relatórios
</f:facet>
<p:panelGrid columns="2" styleClass="gridNoLine">
<p:selectOneMenu value="#{relatoriosBean.tipoEventoRelatorioSelecionado}"
required="true"
requiredMessage="Selecione o relatório a ser gerado."
effect="fade">
<f:selectItem itemLabel="Selecione um item..." itemValue=""/>
<f:selectItems value="#{relatoriosBean.tiposEventoRelatorios}">
</f:selectItems>
</p:selectOneMenu>
<p:commandButton icon="ui-icon-document"
title="Gerar relatório"
actionListener="#{relatoriosBean.gerarRelatorio}"
update="UPDATE THE SELECTONEMENU OF THE LINE">
<f:setPropertyActionListener value="#{atual.idtEvento}"
target="#{relatoriosBean.idEventoSelecionado}}"/>
</p:commandButton>
</p:panelGrid>
</p:column>
</p:dataTable>
As you can see, inside one of the datatable columns i have a selectOneMenu. In the same column i have a button with a actionListener setted. Well, what i want is: Update the selectOneMenu of the column based on the click of the commandButton. There is a way to do this?
Ok! Now the f:setPropertyActionListener isn't setting the property eventoSelecionado. Here is the code:
<p:dataTable value="#{relatoriosBean.listaEventos}"
var="atual">
...
<p:column>
<f:facet name="header">
Relatórios
</f:facet>
<p:panelGrid columns="2"
styleClass="gridNoLine">
<p:selectOneMenu id="somRelatorios"
value="#{relatoriosBean.relatorioSelecionado}"
required="true"
requiredMessage="Selecione o relatório a ser gerado."
effect="fade">
<f:selectItem itemLabel="Selecione um item..." itemValue=""/>
<f:selectItems value="#{relatoriosBean.relatorios}">
</f:selectItems>
</p:selectOneMenu>
<p:commandButton id="cbGerarRelatorio"
icon="ui-icon-document"
title="Gerar relatório"
actionListener="#{relatoriosBean.gerarRelatorio}"
update=":frmRelatorios:opPainelDados"
process="#this somRelatorios"
immediate="true">
<f:setPropertyActionListener target="#{relatoriosBean.eventoSelecionado}"
value="#{atual}"/>
</p:commandButton>
</p:panelGrid>
</p:column>
</p:dataTable>
In the gerarRelatorio action listener, the property eventoSelecionado is comming as null. What is wrong?

Answer 1

Sure, add this id=mySelectOne to your <p:selectOneMenu/> and on your <p:commandButton/> set the update attribute to update="mySelectOne". But to get the best results on this ajax update, I'd strongly advise you set your managed bean annotation to #ViewScoped if you haven't already done so. Your command button should look like this at the end of the update
<p:commandButton icon="ui-icon-document"
title="Gerar relatório"
actionListener="#{relatoriosBean.gerarRelatorio}"
update="mySelectOne">