当按下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
我在JSF中的h:messages标记有问题，该标记根本不显示任何消息.单击该按钮时，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 <p:commandButton>发送ajax请求.默认情况下，Ajax请求没有任何形式的反馈(除非在某处使用了PrimeFaces的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<p:commandButton>上指定update属性以指向<h:messages>组件的客户端ID.
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 <p:messages>替换它，该属性具有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>
另一种完全不同的选择是通过向按钮添加ajax="false"属性来关闭ajax，这样将执行同步回发，从而有效地进行整页更新，就像标准JSF <h:commandButton>的行为一样在不使用<f:ajax>的情况下使用.
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>
另请参见:
- 了解PrimeFaces流程/更新和JSF f:ajax执行/渲染属性
- Understanding PrimeFaces process/update and JSF f:ajax execute/render attributes
See also:
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