查看Primefaces红色组件中的错误 [英] See error in Primefaces red component
问题描述
我在tab组件中有一些Primefaces输入组件，它们是从java bean类获取数据的.他们完美地工作.问题是一定有问题，因为如果我切换到另一个选项卡然后又回来，则组件会变成红色.虽然它们仍然可以工作，但这可能与我的应用程序中存在的另一个问题有关.我怎么看这个红色是什么意思?控制台上没有消息.有没有我收到的消息吗?
I have some Primefaces input components in a tab component, which get their data from a java bean class. They work perfectly. The problem is that something is must be wrong, because if I change to another tab and come right back the components become red. They still work though, but this might be related with another problem I have in my application. How can I see what this red means? No messages appear on the console. Are there any messages that I don't get?
添加了屏幕截图&代码
Added screenshot & Code
我的代码:
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:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui">
<h:body>
<ui:composition>
<h:form>
<p:panelGrid columns="2" style="margin-bottom:10px" cellpadding="5">
<h:outputText value="Item: "/>
<p:selectOneMenu value="#{devTestController.items}">
<f:selectItems value="#{devTestController.items}" var="item" itemLabel="#{item.label}" itemValue="#{item.value}"/>
</p:selectOneMenu>
</p:panelGrid>
<p:commandButton value="asdf1" action="#{devTestController.doAction()}"/>
</h:form>
</ui:composition>
</h:body>
</html>
Java bean:
Java bean:
import java.util.LinkedList;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
@ManagedBean
@RequestScoped
public class DevTestController
{
private List<Parameter> items;
@PostConstruct
public void initList()
{
items = new LinkedList<>();
items.add(new Parameter("Item1", "Item1"));
items.add(new Parameter("Item2", "Item2"));
items.add(new Parameter("Item3", "Item3"));
}
public List<Parameter> getItems()
{
return items;
}
public void doAction()
{
System.out.println("asdf");
}
}
推荐答案
我找到了它.我不得不将h:messages标记放在某个位置，然后使用按钮对其进行更新. 我现在在XHTML中的表单:
I found it. I had to put an h:messages tag somewhere and update it using a button. My form in XHTML now:
<h:form>
<h:messages id="errorMessages" style="color:red;margin:8px;" />
<br></br>
<p:panelGrid columns="2" style="margin-bottom:10px" cellpadding="5">
<h:outputText value="Item: "/>
<p:selectOneMenu value="#{devTestController.items}">
<f:selectItems value="#{devTestController.items}" var="item" itemLabel="#{item.label}" itemValue="#{item.value}"/>
</p:selectOneMenu>
</p:panelGrid>
<p:commandButton value="asdf1" update = "errorMessages" action="#{devTestController.doAction()}"/>
</h:form>
现在，当我按下按钮时会收到消息:
Now I get the messages when I press the button:
看来我想念一个转换器.
It seems that I am missing a converter.
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