p：不存在的ID的ajax更新

Question

I'm using PrimeFaces and I have a line:

<p:ajax update="toUpdate">

the problem is, that this ID not always exists on the page. ( the page is dynamic and sometimes it contains a part that have this specific ID and sometimes not) When it exists, it works great, but when the ID doesn't exist, the component crash - (probably it's some validation issue)

How can I fix it?

Is it a well known issue?

Thanks!

Answer 1

You need to provide an always rendered component to update, for example:

<p:ajax update="toUpdate">

<h:panelGroup id="toUpdate">

    <p:dataTable id="tableID" rendered="#{bean.someCondition>"...

</h:panelGroup>

So, if you have a component that can be o or not visible, do not use it for update, because can be out of components tree. Instead, use a component (container) that your are sure that be rendered and present in the components tree.

Answer 2

Try this code

 <f:ajax render="toUpdate">

    <h:outputText id="toUpdate">

      <!--  do something -->

    </h:outputText>