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f:setPropertyActionListener始终设置为null

本文介绍了f:setPropertyActionListener始终设置为null的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我试图使用<f:setPropertyActionListener>将当前迭代的<p:dataTable var>放置为托管bean的属性.但是，它始终设置为null.

I'm trying to put the currently iterated <p:dataTable var> as a property of a managed bean using <f:setPropertyActionListener>. However, it is always set as null.

视图dentistas.xhtml:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
<html xmlns="http://www.w3.org/1999/xhtml"  
    xmlns:h="http://java.sun.com/jsf/html"  
    xmlns:f="http://java.sun.com/jsf/core"  
    xmlns:ui="http://java.sun.com/jsf/facelets"  
    xmlns:p="http://primefaces.org/ui">  

<h:head>  

</h:head>  
<h:body>  
    <ui:composition template="/templates/template.xhtml">  

        <ui:define name="content">  
            <h:form id="formDentistas">  

                <p:growl autoUpdate="true" />  

                <p:commandButton icon="ui-icon-plus" value="Cadastrar"  
                    id="cadastrar" oncomplete="dialogCadastrar.show()" />  


                <p:dataTable var="dentista" value="#{dentistaMB.dentistas}"  
                    paginator="true" emptyMessage="Não foi encontrado nenhum registro"  
                    rows="10" id="dataTableDentistas">  

                    <f:facet name="header">Lista de Dentistas</f:facet>  
                    <p:column headerText="Nome" sortBy="nome" filterBy="nome" id="nome"  
                        width="200px">  
                    #{dentista.pessoaFisica.nome}  
                </p:column>  

                    <p:column headerText="Data Nascimento" sortBy="dataNascimento"  
                        filterBy="dataNascimento" id="dataNascimento" width="60px">  
                    #{dentista.pessoaFisica.dataNascimento}  
                </p:column>  

                    <p:column headerText="CRO" sortBy="cro" filterBy="cro" id="cro"  
                        width="60px">  
                    #{dentista.cro}  
                </p:column>  

                    <p:column headerText="Ações" style="width:50px;">  
                        <p:commandButton value="Alterar" icon="ui-icon-pencil">  
                           <f:setPropertyActionListener target="#{dentistaMB.selectedDentista}" value="#{dentista}" />                                  
                        </p:commandButton>  

                        <p:commandButton value="Remover" icon="ui-icon-trash"  
                            actionListener="#{dentistaMB.deletar}">  
                            <f:setPropertyActionListener target="#{dentistaMB.selectedDentista}" value="#{dentista}" />  
                        </p:commandButton>  
                    </p:column>  

                </p:dataTable>  
            </h:form>  

            <ui:include src="/tabelas/dialog_insert_dentista.xhtml" />  


        </ui:define>  
    </ui:composition>  


</h:body>  
</html>

托管bean，DentistaMBImpl:

package br.com.odontonew.mb;  

import java.util.List;  
import java.util.Map;  

import javax.annotation.PostConstruct;  
import javax.faces.bean.ManagedBean;  
import javax.faces.bean.ManagedProperty;  
import javax.faces.bean.RequestScoped;  
import javax.faces.bean.SessionScoped;  
import javax.faces.bean.ViewScoped;  
import javax.faces.context.ExternalContext;  
import javax.faces.context.FacesContext;  
import javax.faces.convert.FacesConverter;  
import javax.faces.event.ActionEvent;  

import org.apache.log4j.Logger;  
import org.primefaces.context.RequestContext;  

import br.com.odontonew.bean.Dentista;  
import br.com.odontonew.bean.EstadoCivil;  
import br.com.odontonew.bean.PessoaFisica;  
import br.com.odontonew.bean.Sexo;  
import br.com.odontonew.bean.SituacaoPessoa;  
import br.com.odontonew.bean.Uf;  
import br.com.odontonew.bo.BasicBO;  
import br.com.odontonew.exception.BOException;  

@ManagedBean(name = "dentistaMB")  
@ViewScoped  
public class DentistaMBImpl extends BasicMBImpl {  

    private Logger logger = Logger.getLogger(DentistaMBImpl.class);  

    @ManagedProperty("#{dentistaBO}")  
    private BasicBO dentistaBO;  
    private Dentista dentista;  
    private Dentista selectedDentista;  
    private List<Dentista> dentistas;  

    // Lists  
    private List<EstadoCivil> estadosCivis;  
    private List<SituacaoPessoa> situacoesPessoa;  
    private List<Sexo> sexos;  
    private List<Uf> ufs;  

    @PostConstruct  
    public void init() {  
        dentista = new Dentista();  
        dentista.setPessoaFisica(new PessoaFisica());  
        dentista.getPessoaFisica().setSexo(new Sexo());  
        dentista.getPessoaFisica().setEstadoCivil(new EstadoCivil());  
        dentista.getPessoaFisica().setSituacao(new SituacaoPessoa());  
        dentista.getPessoaFisica().setUf(new Uf());  
        estadosCivis = (List<EstadoCivil>) dentistaBO  
                .findByNamedQuery(EstadoCivil.FIND_ALL);  
        situacoesPessoa = (List<SituacaoPessoa>) dentistaBO  
                .findByNamedQuery(SituacaoPessoa.FIND_ALL);  
        sexos = (List<Sexo>) dentistaBO.findByNamedQuery(Sexo.FIND_ALL);  
        ufs = (List<Uf>) dentistaBO.findByNamedQuery(Uf.FIND_ALL);  
    }  

    public void salvar(ActionEvent event) {  
        try {  
            dentista = (Dentista) dentistaBO.save(dentista);  
            addInfoMessage("Dentista salvo com sucesso");  
            RequestContext.getCurrentInstance().execute(  
                    "dialogCadastrar.hide()");  

        } catch (BOException e) {  
            addErrorMessage(e.getMessage());  
        }  
    }  

    public void atualizar(ActionEvent event) {  
        try {  
            dentistaBO.update(selectedDentista);  
            addInfoMessage("Dentista atualizado com sucesso");  
        } catch (BOException e) {  
            addErrorMessage(e.getMessage());  
        }  
    }  

    public void deletar(ActionEvent event) {  
        try {             
            dentistaBO.delete(selectedDentista);  
            addInfoMessage("Dentista deletado com sucesso");  
        } catch (BOException e) {  
            addErrorMessage(e.getMessage());  
        }  
    }  

    public List<Dentista> getDentistas() {  
        try {  
            if (dentistas == null)  
                dentistas = (List<Dentista>) dentistaBO  
                        .findByNamedQuery(Dentista.FIND_ALL_COMPLETO);  

            return dentistas;  
        } catch (BOException e) {  
            addErrorMessage(e.getMessage());  
            return null;  
        }  
    }  

    /* gets and sets */  

    public Dentista getSelectedDentista() {  
        return selectedDentista;  
    }  

    public void setSelectedDentista(Dentista selectedDentista) {  
        this.selectedDentista = selectedDentista;  
    }  

    public Dentista getDentista() {  
        return dentista;  
    }  

    public void setDentista(Dentista dentista) {  
        this.dentista = dentista;  
    }  

    public Logger getLogger() {  
        return logger;  
    }  

    public void setLogger(Logger logger) {  
        this.logger = logger;  
    }  

    public List<EstadoCivil> getEstadosCivis() {  
        return estadosCivis;  
    }  

    public void setEstadosCivis(List<EstadoCivil> estadosCivis) {  
        this.estadosCivis = estadosCivis;  
    }  

    public List<SituacaoPessoa> getSituacoesPessoa() {  
        return situacoesPessoa;  
    }  

    public void setSituacoesPessoa(List<SituacaoPessoa> situacoesPessoa) {  
        this.situacoesPessoa = situacoesPessoa;  
    }  

    public List<Sexo> getSexos() {  
        return sexos;  
    }  

    public void setSexos(List<Sexo> sexos) {  
        this.sexos = sexos;  
    }  

    public void setDentistas(List<Dentista> dentistas) {  
        this.dentistas = dentistas;  
    }  

    public List<Uf> getUfs() {  
        return ufs;  
    }  

    public void setUfs(List<Uf> ufs) {  
        this.ufs = ufs;  
    }  

    public BasicBO getDentistaBO() {  
        return dentistaBO;  
    }  

    public void setDentistaBO(BasicBO dentistaBO) {  
        this.dentistaBO = dentistaBO;  
    }  



}

推荐答案

在这里，

<p:commandButton value="Remover" icon="ui-icon-trash"  
    actionListener="#{dentistaMB.deletar}">  
    <f:setPropertyActionListener target="#{dentistaMB.selectedDentista}" value="#{dentista}" />  
</p:commandButton>

您正在使用actionListener方法而不是action方法执行删除.这个不对.业务操作应使用action方法执行.在之前 action方法之前，所有动作侦听器(包括<f:setPropertyActionListener>)都以与在命令组件上声明和分配的顺序完全相同的顺序被调用.因此，实际上，首先调用删除操作，然后设置属性.这就解释了为什么在删除过程中该属性为null.

you're performing the delete in an actionListener method instead of an action method. This is not right. Business actions should be performed in the action method. All action listeners, including the <f:setPropertyActionListener>, are invoked before action method in the very same order as they are declared and assigned on the command component. So, in effects, the delete is first invoked and then the property is set. That explains why the property is null during the delete.

修复很简单:使其成为真正的action方法:

The fix is simple: make it a real action method:

<p:commandButton value="Remover" icon="ui-icon-trash"  
    action="#{dentistaMB.deletar}">  
    <f:setPropertyActionListener target="#{dentistaMB.selectedDentista}" value="#{dentista}" />  
</p:commandButton>

别忘了删除ActionEvent参数:

public void deletar() {  
    // ...
}

另请参见:

  • action和actionListener之间的差异

    • See also:

    • Differences between action and actionListener

      • 无关与具体问题无关，如果您碰巧以Servlet 3.0/EL 2.2兼容容器为目标，那么甚至可以完全摆脱该<f:setPropertyActionListener>:

      Unrelated to the concrete problem, if you happen to target a Servlet 3.0 / EL 2.2 compatible container, then you can even get rid of that <f:setPropertyActionListener> altogether:

      <p:commandButton value="Remover" icon="ui-icon-trash"  
    action="#{dentistaMB.deletar(dentista)}" />

      使用:

      public void deletar(Dentista selectedDentista) {  
    // ...
}

      另请参阅

      这篇关于f:setPropertyActionListener始终设置为null的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

09-17 08:01
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