Primefaces blockUI stops working after ajax update

Question

I am trying to create a datatable that displays a blockUI whenever it is busy, and I have been mostly successful. It now grays out and shows \"Loading...\" whenever I click

Answer 1

I've had the same problem and kind of simillar scenario:

<p:dataTable>
    ....
    <p:ajax event="rowSelect" update="buttons" global="false" onstart="blockMessageButtons.show();" oncomplete="blockMessageButtons.hide();"/>
</p:dataTable>

<p:outputPanel layout="block" id="buttons">
    <!-- content to be blocked -->
</p:outputPanel>

<p:blockUI block="buttons" widgetVar="blockMessageButtons"/>

The problem was that panel buttons was both updated by ajax, and blocked by blockUI. I had to divide it in two:

<p:dataTable>
    ....
    <p:ajax event="rowSelect" update="buttons-content" global="false" onstart="blockMessageButtons.show();" oncomplete="blockMessageButtons.hide();"/>
</p:dataTable>

<p:outputPanel layout="block" id="buttons-container">
    <p:outputPanel layout="block" id="buttons-content">
        <!-- content to be blocked -->
    </p:outputPanel>
</p:outputPanel>

<p:blockUI block="buttons-container" widgetVar="blockMessageButtons"/>

Answer 2

@siebz0r already provided the explanation why blockUI stops working when a component is updated.

I am using a one blockUI element in the template for all other pages and thus don't want to include more blockUI elements.

If the blockUI element is updated as well one does not need to move the blockUI inside the component that will be updated.

Here is an example:

<p:panel id="surroundingPanel">

    ...

    <p:commandButton value="ButtonName" styleClass="blockUi"
        action="actionToBeExecuted" update=":surroundingPanel :blockUiBinding" />
</p:panel>

<p:outputPanel id="blockUiBinding">
    <p:blockUI block=":elementToBeBlocked" trigger="@(.blockUi)">
        Loading ...
    </p:blockUI>
</p:outputPanel>

The element blockUiBinding can be located anywhere, as long as it can be updated. It is wrapping the blockUI element, because blockUI generates at least two different divs. So when the wrapping element is updated also the blockUI will be updated.

Answer 3

The trigger attribute binds jQuery listeners on the specified elements. However if you update an element the binding gets lost. I don't know if it works, but you could try moving the <p:blockUI inside the resultsPanel. I suspect that when you update the panel the blockUI gets updated too and thus re-binding the listener to the data table.

<p:panel header="Results Grid" id="resultsPanel">
    ...
    <p:dataTable ... id="VAResults" ... >
        ...
    </p:dataTable>
    ....
    <p:blockUI block="resultsPanel" trigger="submitButton, resetScenarioButton, VAResults">
    Loading...
</p:blockUI>
</p:panel>