按下 p:commandButton 时，h:messages 不显示消息 [英] h:messages does not display messages when p:commandButton is pressed
问题描述
我对 JSF 中的 h:messages 标记有一个问题，就是它根本不显示任何消息.当我单击按钮时，Glassfish 日志中没有错误.设置如下:
I have a problem with the h:messages tag in JSF that simply does not show any messages. In the Glassfish log are no errors when I click the button. The setup is as follows:
test.xhtml:
test.xhtml:
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:p="http://primefaces.org/ui"
xmlns:j="http://primefaces.org/ui"
xmlns:f="http://java.sun.com/jsf/core">
<h:head>
<title>test</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</h:head>
<h:body>
<h:messages globalOnly="true"/>
<h:form id="loginform">
<p:commandButton id="testButton" value="Test"
action="#{loginSessionBean.test()}" />
</h:form>
</h:body>
</html>
使用 SessionScopedBean:
With The SessionScopedBean:
@ManagedBean
@SessionScoped
public class LoginSessionBean implements Serializable {
private static final long serialVersionUID = 1L;
...
public String test(){
FacesContext fc = FacesContext.getCurrentInstance();
fc.addMessage(null, new FacesMessage(FacesMessage.SEVERITY_WARN, "Test!", null));
return "";
}
推荐答案
您正在使用 PrimeFaces autoUpdate="true").您应该明确指定要在 ajax 响应上更新的视图部分.
You're sending an ajax request with PrimeFaces <p:commandButton>. Ajax requests have by default no form of feedback (unless PrimeFaces' autoUpdate="true" is been used somewhere). You should be explicitly specifying parts of the view which you'd like to update on ajax response.
一种方法是在 update 属性以指向
One way is specifying the update attribute on <p:commandButton> to point to the client ID of the <h:messages> component.
<h:messages id="messages" ... />
<h:form>
<p:commandButton ... update=":messages" />
</h:form>
另一种方法是用 PrimeFaces autoUpdate 属性，用于自动更新 ajax 响应.
Another way is to replace it by PrimeFaces <p:messages> which has an autoUpdate attribute for the purpose of automatic update on ajax response.
<p:messages ... autoUpdate="true" />
<h:form>
<p:commandButton ... />
</h:form>
一个完全不同的替代方法是通过向按钮添加 ajax="false" 属性来关闭 ajax，这种方式将执行同步回发，有效地导致整页更新，就像标准 JSF
A completely different alternative is to turn off ajax by adding ajax="false" attribute to the button, this way a synchronous postback will be performed which effectively results in a full page update, exactly like as how the standard JSF <h:commandButton> behaves when used without <f:ajax>.
<h:messages ... />
<h:form>
<p:commandButton ... ajax="false" />
</h:form>
另见:
- 了解 PrimeFaces 流程/更新和 JSF f:ajax 执行/渲染属性
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