jsf呈现的条件不适用于selectOneMenu

Question

Hi I have read tons of similar questions but the answers didnt work for me.

I have this

<p:selectOneMenu id="tipoTaxon" value="#{taxonDM.taxon.tipoTaxon}"
                        name="tipoTaxon">
                        <f:converter converterId="tipoTaxonConverter" />
                        <f:selectItem itemLabel="Seleccione uno" itemValue="0" />
                        <f:selectItems value="#{tipoTaxonDM.tiposTaxones}" var="txn"
                            itemValue="#{txn.idTipoTaxon}" itemLabel="#{txn.nombreTipo}" />
                        <p:ajax  render="test" />
                    </p:selectOneMenu>
                    <p:inputText id="test" rendered="#{taxonDM.taxon.tipoTaxon != null}" />

As you can see I want to render test when an option is selected. tipoTaxon is basically a table on my database and is class, so I had to make a converter. It seems to work so for now, I am not getting the errors I had before. Now I dont get any errors but "test" is not getting rendered.

I tried the following

#{taxonDM.taxon.tipoTaxon != null}

also

#{taxonDM.taxon.tipoTaxon.idTipoTaxon != null}"

I tried setting test on another panel

<h:panelGrid columns="2" id="formTaxon">
                    <h:outputLabel value="Nombre Científico Taxón" for="taxonInput" />
                    <p:inputText value="#{taxonDM.taxon.nombreCientificoTaxon}"
                        id="taxonInput" />
                    <h:outputLabel value="Nombre Común" for="nombreComunInput" />
                    <p:inputText value="#{taxonDM.taxon.nombreComunTaxon}"
                        id="nombreComunInput" />
                    <h:outputLabel value="Tipo" for="tipoTaxon" />
                    <p:selectOneMenu id="tipoTaxon" value="#{taxonDM.taxon.tipoTaxon}"
                        name="tipoTaxon">
                        <f:converter converterId="tipoTaxonConverter" />
                        <f:selectItem itemLabel="Seleccione uno" itemValue="0" />
                        <f:selectItems value="#{tipoTaxonDM.tiposTaxones}" var="txn"
                            itemValue="#{txn.idTipoTaxon}" itemLabel="#{txn.nombreTipo}" />
                        <p:ajax  render="formTaxon2" />

                    </p:selectOneMenu>
                </h:panelGrid>
                <h:panelGrid columns="2" id="formTaxon2">
                    <p:inputText id="test" rendered="#{taxonDM.taxon.tipoTaxon != null}" />
                </h:panelGrid>

using render="test" or render="formTaxon2"

I added a listener method to p:ajax and it worked so i know it is getting invoked.

    public void tipoTaxonesXX(AjaxBehaviorEvent e){
            System.out.println("Working");
    }

It did printed "Working" on my console. My form is not saving either so I guess it has trouble transforming from tipotaxon or number, but it gets null, i ll fix that later.

Here is the converter if someone needs to

import ec.edu.puce.biologia.model.TipoTaxon;

@FacesConverter("tipoTaxonConverter")
public class TipoTaxonConverter implements Converter {

    private TipoTaxonDao tipoTaxonDao;

    @Override
    public Object getAsObject(final FacesContext arg0, final UIComponent arg1,
            final String value) {
        if (value == null || !value.matches("\\d+")) {
            return null;
        }
        try {
            TipoTaxon tipoTaxon = tipoTaxonDao.recuperar(Long.valueOf(value));
            System.out.println("Getting the operation value = "
                    + tipoTaxon.getNombreTipo());
            return tipoTaxon;
        } catch (NumberFormatException e) {
            return null;
            // throw new ConverterException(new
            // FacesMessage("Unknown operation ID: " + value));
        } /*
         * catch (EntidadNoEncontradaException e) { throw new
         * ConverterException(new FacesMessage("Unknown operation ID: " +
         * value)); }
         */
    }

    @Override
    public String getAsString(final FacesContext arg0, final UIComponent arg1,
            final Object value) {
        if (!(value instanceof TipoTaxon)
                || ((TipoTaxon) value).getIdTipoTaxon() == null) {
            return null;
        }

        return String.valueOf(((TipoTaxon) value).getIdTipoTaxon());
    }
}

I need to put some exceptions

UPDATE ANSWER My code here has many errors, I changed it a lot, but the main problem was that the EJB on the converter didnt work. I ended up using ManagedBean. More on that here http://balusc.blogspot.com/2011/09/communication-in-jsf-20.html#ProcessingGETRequestParameters

Answer 1

As I said in my previous answer to your question , both <p:selectOneMany> value must point to your user class, TipoTaxon , and every <f:selectItem> / <f:selectItems> itemValue must also point that same user class, TipoTaxon .

As you see, neither itemValue="0" , nor itemValue="txn.nombreTipo" satisfies the abovementioned statement. Correct it and see it working.

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My advice for future postings will be to post the complete, relevant and necessarily formatted code , which in your case includes converter code, your model class and managed bean parts. Also, do not post the same question twice/thrice, etc. and instead try to work it out on your own , otherwise it'll be closed as duplicate.