PrimeFaces Beginner's Guide

书名：PrimeFaces Beginner's Guide
作者名：K. Siva Prasad Reddy
本章字数：98字
更新时间：2021-07-21 17:59:05

Time for action – displaying FacesMessage using <p:messages>

Let us see how to display multiple FacesMessage using <p:messages>:

Create a form with two commandButton elements and the <p:messages/> component using the following code:

<h:form style="width: 500px; padding-left: 10px;">
  <p:panel header="Messages with All Severity levels">
  <p:messages globalOnly="true" autoUpdate="true"/>
  <p:commandButton value="Show FacesMessages" actionListener="#{messagesController.addMultipleMsgs}"/>
  </p:panel>
</h:form>

Add FacesMessage in the actionListener method as follows:

public void addMultipleMsgs()
{
  FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO,"Sample Info Msg", null));
  FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_WARN,"Sample Warn Msg", null));
  FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR,"Sample Error Msg", null));
  FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_FATAL,"Sample Fatal Msg", null));
}

What just happened?

We added FacesMessage objects with various severity levels in the actionListener method addMultipleMsgs(), and updated the form using autoUpdate="true". Then <p:messages/> displays all of those errors as follows:

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