对象为< f:selectItems>中的itemValue [英] Object as itemValue in <f:selectItems>
本文介绍了对象为< f:selectItems>中的itemValue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
是否可以在标记中包含 itemValue 对象?
Is it possible to have objects as itemValue in tag?
例如我有一个类Foo:
for example I have a class Foo:
public class Foo {
private int id;
private String name;
private Date date;
}
另一类酒吧
public class Bar {
private Foo foos;
}
public class BarBean {
private Set<Foo> foos;
}
现在在名为BarBean的Bean中我需要得到一个Foo来自用户的当前栏如下:
Now in a Bean called BarBean I need to have a to get the Foo of the current Bar from User like this:
<h:selectOneMenu value="#{barBean.bar.foo}" required="true">
<f:selectItems value="#{barBean.foos}" var="foo" itemLabel="#{foo.name}" itemValue="#{foo}" />
</h:selectOneMenu>
---------------编辑:
---------------edited:
my converter:
package ir.khorasancustoms.g2g.converters;
import ir.khorasancustoms.g2g.persistance.CatalogValue;
import java.util.ResourceBundle;
import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.FacesConverter;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
@FacesConverter("ir.khorasancustoms.CatalogValueConverter")
public class CatalogValueConverter implements Converter {
@Override
public Object getAsObject(FacesContext context, UIComponent component, String value) {
SessionFactory factory = new Configuration().configure().buildSessionFactory();
Session session = factory.openSession();
try {
int id = Integer.parseInt(value);
CatalogValue catalogValue = (CatalogValue) session.load(CatalogValue .class, id);
return catalogValue;
} catch (Exception ex) {
Transaction tx = session.getTransaction();
if (tx.isActive()) {
tx.rollback();
}
ResourceBundle rb = ResourceBundle.getBundle("application");
String message = rb.getString("databaseConnectionFailed");
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_FATAL, message, message));
} finally {
session.close();
}
return null;
}
@Override
public String getAsString(FacesContext context, UIComponent component, Object value) {
return ((CatalogValue) value).getId() + "";
}
}
和我的脸谱:
<h:outputText value="#{lbls.paymentUnit}:"/>
<h:selectOneMenu id="paymentUnit" label="#{lbls.paymentUnit}" value="#{price.price.ctvUnit}" required="true">
<f:selectItems value="#{price.paymentUnits}"/>
<f:converter converterId="ir.khorasancustoms.CatalogValueConverter"/>
</h:selectOneMenu>
<h:message for="paymentUnit" infoClass="info" errorClass="error" warnClass="warning" fatalClass="fatal"/>
推荐答案
是有可能。
您需要编写一个转换器,将Foo转换为 SelectItem
You need to write a converter that will convert Foo to SelectItem
这篇关于对象为< f:selectItems>中的itemValue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IT屋!
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