Rendered Does not work in datatable

Question

Good afternoon.

I have a simple problem. However, I am struggling to solve. I have these 2 methods to control my Rendered do dataTable:

// Filtra o simulado..
    @Transactional
    public void gerarSimulado() {
        this.questoes = simuladoFiltroDAO.geraSimuladoPorFiltro(
                cursoSelecionado.getCodigo(), this.complexidadeSelecionada,
                this.numeroDeQuestoesSimulado);
        isMostraQuestoesGeradasSimulado();
        this.simulado.setNumeroQuestoesSimulado(numeroDeQuestoesSimulado);
        this.simulado.setCurso(cursoSelecionado);
        this.simulado.setQuestoes(questoes);

    }

In particular that method boolean, that controls the rendered:

public boolean isMostraQuestoesGeradasSimulado() {
            return this.questoes != null;
        }

On my xhtml page, I have:

    <p:dataTable id="exibePerguntas" rendered="#{gerarSimuladoBean.mostraQuestoesGeradasSimulado}" var="questao" paginator="true"
                            rowsPerPageTemplate="2,3,5,10,12" paginatorPosition="bottom" value="#{gerarSimuladoBean.questoes}">
            <p:column headerText="Perguntas">
                        <br></br>
                        <h:outputText escape="false" value="#{questao.pergunta}"  />
            </p:column>
</p:dataTable>

Simulated generate button code:

 <p:commandButton id="geraSimulado" value="Gerar Simulado" action="#{gerarSimuladoBean.gerarSimulado}" 
                    icon="ui-icon-search" update="@this exibePerguntas">
                </p:commandButton>

By logic, when clicking on the button "generate simulated", it is already to appear the questions right? Since the questions will be populated and the result will give true. Only that’s not what’s happening. Does anyone know why?

Answer 1

You are sending the button to update the datatable "exibePerguntas", only that this datatable has a rendered. So, if there is nothing to show, this datatable does not exist and the button has no current.

Change the update="" from the button to some other account that has no rendered. Or to @form itself if it and the table are in the same form.

also check if the questions were actually generated.