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我有一个页面,无论数据库是否有一些信息,都会呈现 SelectOneMenu。我的表格如下所示:

...
<h:form id="wrapperUpload" enctype="multipart/form-data" >
<h:outputLabel for="option" value="Tipo de carga: "
                            rendered="#{uploadFile.check(userVerifier.dependencia)}" />
<h:selectOneMenu id="option"
                 value="#{uploadFile.optionSelected}"
                 rendered="#{uploadFile.check(userVerifier.dependencia)}"  >
    <f:selectItems value="#{uploadFile.options}" />
</h:selectOneMenu>
<h:outputLabel for="upfile" value="Archivo: " />
<t:inputFileUpload id="upfile" required="true" 
                   value="#{uploadFile.upFile}" />
<h:commandButton value="Validar #{userVerifier.dependencia}"
                 action="#{uploadFile.upload}"
                 onclick="return confirmation()" >
    <f:param name="dependencia" value="#{userVerifier.dependencia}" />
</h:commandButton>
</h:form>
...

我的豆子是

private UploadedFile upFile;
private boolean showOptions = false;
private final String[] options = {
    "Seleccione una opción.",
    "Cargar toda la información.",
    "Cargar solo información errónea."
};
private String optionSelected;
private Database db = new Database();

public UploadedFile getUpFile() {
    return upFile;
}

public void setUpFile(UploadedFile upFile) {
    this.upFile = upFile;
}

public String[] getOptions() {
    return options;
}

public void setOptionSelected(String optionSelected) {
    this.optionSelected = optionSelected;
}

public String getOptionSelected() {
    return optionSelected;
}

public boolean check(String dependencia) {
    String hasInfo;
    hasInfo = db.checkForInfo(dependencia);
    if (hasInfo.equals("T")) {
        showOptions = true;
    } else {
        showOptions = false;
    }
    return showOptions;
}

public String upload() {
    byte[] buffer = null;
    int count = 0;
    File serverFile = null;
    InputStream input = null;
    OutputStream output = null;

    Map<String, String> params = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap();
    String dependencia = params.get("dependencia");
    String extension = FilenameUtils.getExtension(upFile.getName());

    System.out.println("__depend:   " + dependencia);
    System.out.println("__option:   " + optionSelected);  //null
...
...

最后,当我点击按钮时,SelectOneMenu(或我的 bean 中的 selectedOption)的值始终为空......如何解决这个问题?我错过了什么吗?

忘了提,如果我删除渲染部分一切正常......

4

1 回答 1

0

忘了提,如果我删除渲染部分一切正常

这只能意味着 bean 是请求范围的,并且该rendered属性取决于基于请求的变量,该变量在显示表单时存在于初始请求中,但在处理表单提交时在后续请求中不存在。

将 bean 放在视图范围内或确保在后续请求中保留基于请求的变量应该可以解决您的问题。

由于您尚未发布真实代码,因此无法发布如何正确修复它的代码。

也可以看看:


更新:根据您的更新和评论,您应该创建beanUserVerifier的托管属性UploadFile并在(后)构造函数中进行预初始化。就像是:

@ManagedBean
@ViewScoped
public class UploadFile {

    @ManagedProperty("#{userVerifier}")
    private UserVerifier userVerifier; // +setter

    private boolean showOptions;

    @PostConstruct
    public void init() {
        showOptions = "T".equals(db.checkForInfo(userVerifier.getDependencia()));
    }

    public boolean isShowOptions() {
        return showOptions;
    }

    // ...
}

rendered="#{uploadFile.showOptions}"

并摆脱<f:param>.

于 2011-11-03T17:50:20.687 回答