p:blockUI / pe:blockUI: Why doesn't it work in my simple example? - primefaces

Question

I would like to hide an element while a button triggered action is being performed:
<h:form id="sendtxform">
<p:panelGrid columns="1" styleClass="ui-noborder">
<pe:blockUI block="input" widgetVar="blockUIWidget">
LOADING<br />
<p:graphicImage name="images/ajax-loader.gif" />
</pe:blockUI>
<p:commandButton id="command" value="ISSUE APP"
actionListener="#{transactionXmlController.getTxDataPredefined}"
ajax="true" update="growl,input"
onstart="PF('blockUIWidget').block();"
oncomplete="PF('blockUIWidget').unblock();">
</p:commandButton>
<p:inputTextarea id="input" cols="150" rows="30" autoResize="false"
value="#{transactionXmlEditableModel.xml}" />
</p:panelGrid>
</h:form>
I tried with p:blockUI / pe:blockUI and with/without the onstart and oncomplete attributes.
What am I doig wrong ? I use blockUI somewhere else, and it is working fine:
The only difference is that the table is its own trigger.
I followed this tutorial.

Answer 1

Block the input seems to not work, you can wrap the input with a panel and block it.
PrimeFaces Extensions:
<h:form id="sendtxform">
<p:panelGrid columns="1" styleClass="ui-noborder">
<pe:blockUI target="panel" widgetVar="blockUIWidget">
LOADING<br />
<p:graphicImage name="images/ajax-loader.gif" />
</pe:blockUI>
<p:commandButton id="command" value="ISSUE APP"
actionListener="#{transactionXmlController.getTxDataPredefined}"
ajax="true" update="input"
onstart="PF('blockUIWidget').block();"
oncomplete="PF('blockUIWidget').unblock();">
</p:commandButton>
<p:panel id="panel">
<p:inputTextarea id="input" cols="150" rows="30" autoResize="false"
value="#{transactionXmlEditableModel.xml}" />
</p:panel>
</p:panelGrid>
</h:form>
PrimeFaces:
<h:form id="sendtxform">
<p:panelGrid columns="1" styleClass="ui-noborder">
<p:blockUI block="panel" trigger="command">
LOADING<br />
<p:graphicImage name="images/ajax-loader.gif" />
</p:blockUI>
<p:commandButton id="command" value="ISSUE APP"
actionListener="#{transactionXmlController.getTxDataPredefined}"
ajax="true" update="input">
</p:commandButton>
<p:panel id="panel">
<p:inputTextarea id="input" cols="150" rows="30" autoResize="false"
value="#{transactionXmlEditableModel.xml}" />
</p:panel>
</p:panelGrid>
</h:form>