validation - p :fileUpload required ="true" and custom validator doesn't work

Question

这个问题在这里已经有了答案:





PrimeFaces <p:fileUpload mode="advanced"> validator not fired

(2 个回答)


1年前关闭。




自 required <p:fileUpload> 的属性在 PrimeFaces 4.0 final 中似乎仍然不起作用，我尝试创建一个自定义验证器，如下所示。

@FacesValidator(value="fileUploadValidator")
public final class FileUploadValidator implements Validator
{
    @Override
    public void validate(FacesContext fc, UIComponent uic, Object o) 
    throws ValidatorException
    {
        System.out.println("fileUploadValidator called.");

        if(!(o instanceof UploadedFile))
        {
            FacesMessage message = new FacesMessage();
            message.setSeverity(FacesMessage.SEVERITY_ERROR);
            message.setSummary("Error");
            message.setDetail("Required");
            throw new ValidatorException(message);      
        }
    }
}

并指定 <p:fileUpload> .

<p:fileUpload mode="advanced" 
              required="true"
              multiple="true"
              allowTypes="/(\.|\/)(gif|jpe?g|png)$/"
              fileUploadListener="#{bean.fileUploadListener}">
    <f:validator validatorId="fileUploadValidator"/>
</p:fileUpload>

但是从未调用过 validate 方法。因为我在 <p:dataGrid> 中显示图像，这种验证是非常需要的。有没有办法验证空 <p:fileUpload> ?

Answer 1

尝试这个

@ManagedBean(name = "docBean")
@ViewScoped
public class DocumentBean implements Serializable
{
  private UploadedFile file;

  public void handleFileUpload(FileUploadEvent event)
  {
     uploadedFile = event.getFile();
   }

   //action
   public void viewImage()
  {
    if(uploadFile==null){
     FacesContext saveContext = FacesContext.getCurrentInstance();
     saveContext.addMessage(null, new FacesMessage("Error", "Upload file  required"));
   }
 }
}