How to prevent PrimeFaces poll from clearing FacesMessages?

问题

I'm using PrimeFaces poll component to refresh some content.

<h:form id="formBsvtt">
  <p:messages autoUpdate="true" showDetail="false" />
  <p:outputPanel id="panelOut" layout="block">
    ...
    ... content to refresh
    ...
  </p:outputPanel>
  <p:panelGrid id="panelIn" layout="block">
    ...
    ... various input components with validation
    ...
  </p:panelGrid>
  <p:poll widgetVar="poll1" autoStart="true" global="false" interval="15" 
    partialSubmit="true" process="@this" update="panelOut"
    listener="#{myBean.myListener}">
  </p:poll>
</h:form>

As you can see I'm using messages with autoUpdate=true. My Problem is: In case of validation errors FacesMessages will be shown, but disappear not later than 15 seconds.

Is it possible to prevent poll from clearing FacesMessages without setting messages autoUpdate=false?

My web application is much bigger as code snippet specified above and my intention is not updating messages manually in each possible case!

回答1:

PrimeFaces 2.x/3.x

This is not natively possible, so a trick is needed. In the rendered attribute of <p:messages>, check if <p:poll> was been triggered and if so, then return false. This way JSF thinks there's no auto-updatable messages component in the component tree during rendering and will therefore ignore it.

If the <p:poll> is triggered, then its client ID appears as javax.faces.source request parameter. So, this should do:

<p:messages ... rendered="#{param['javax.faces.source'] ne poll.clientId}" />
...
<p:poll binding="#{poll}" ... />

(note: no additional bean properties needed)

PrimeFaces 4.x+

All PrimeFaces command components got a new ignoreAutoUpdate attribute which you could set to false to ignore all autoUpdate="true" components in the ajax update.

<p:poll ... ignoreAutoUpdate="true" />

回答2:

For folks using Primefaces 4.0 and above, the Primefaces team have added an attribute to their ajax aware components to skip triggering components with autoUpdate set to true. So your poll would be

<p:poll ignoreAutoUpdate="true" .../>

See also their blog post about it: http://blog.primefaces.org/?p=2836

来源：https://stackoverflow.com/questions/31806013/premotecommand-and-pmessages-with-autoupdate-true-clears-messages

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