p:fileUpload required ="true";和自定义验证器不起作用 [英] p:fileUpload required="true" and custom validator doesn't work
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问题描述
由于<p:fileUpload>
的required
属性在PrimeFaces 4.0 final中似乎仍然不起作用,因此我尝试创建一个自定义验证器,如下所示.
Since the required
attribute of <p:fileUpload>
still doesn't seem to work in PrimeFaces 4.0 final, I have tried to create a custom validator as follows.
@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);
}
}
}
并用<p:fileUpload>
指定.
<p:fileUpload mode="advanced"
required="true"
multiple="true"
allowTypes="/(\.|\/)(gif|jpe?g|png)$/"
fileUploadListener="#{bean.fileUploadListener}">
<f:validator validatorId="fileUploadValidator"/>
</p:fileUpload>
但是validate方法从未被调用过.由于我要在<p:dataGrid>
中显示图像,因此非常需要此验证.有没有办法验证空的<p:fileUpload>
?
But the validate method was never invoked. Since I'm displaying images in <p:dataGrid>
, this validation is highly required. Is there a way to validate an empty <p:fileUpload>
?
推荐答案
尝试一下
@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"));
}
}
}
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