Primefaces blocks component only once

Question

I need to block datatable when it's updating via ajax. I used blockUI component and it's show() and hide() methods. But it works only once! Where can be the problem? Thanks for help. Here is part of code:

<p:dialog resizable="false" showHeader="false" modal="false"
          widgetVar="statusDialog" draggable="false" closable="false">
  ...
</p:dialog>
<p:panel>
 <p:selectOneMenu id="source" value="#{mainBean.selectedSource}">
   ....
   <p:ajax onstart="statusDialog.show(); feedBlock.show()" 
           oncomplete="statusDialog.hide(); feedBlock.hide()" 
           update="feed" listener="#{mainBean.filter(selectedSource, false)}"/>
 </p:selectOneMenu>
</p:panel>
...
<p:dataTable id="feed" scrollable="true" scrollHeight="460" 
             value="#{mainBean.feed}" var="curr">
  ...
</p:dataTable>
<p:blockUI block="feed" widgetVar="feedBlock"/>

Answer 1

try

<p:blockUI block="feed" trigger="source"/>

and remove feedBlock.show() and feedBlock.hide() from p:ajax

you might need to change trigger="source" into trigger="myform:source" etc...