ajax - Address JSF component in ui:repeat

Question

I'm trying to update an element within an UI-repeat, but unfortunately I still haven't discovered how to correctly address the outputPanel from within the dataTable. I am aware that this problem comes from the different naming containers, nevertheless, I hope there will be a solution.

<h:body>
    <h:form id="form">
        <ui:repeat var="_entry" value="#{test.entries}">
            <p:outputPanel id="counterPanel">
                <h:outputText value="#{test.counter}" />
            </p:outputPanel>

            <p:dataTable var="_p" id="paramTable" value="#{_entry.params}">
                <p:column headerText="Options">
                    <p:commandLink value="Update" update="counterPanel"  />
                </p:column>
            </p:dataTable>
        </ui:repeat>
    </h:form>
</h:body>

The code example above raises the following exception:

javax.servlet.ServletException: Cannot find component with identifier "counterPanel" in view.

Thx, Jakob

Answer 1

Two ways:

1. You need to give the <ui:repeat> a client ID so that you can refer it by the absolute client ID path:

   <h:form id="form">
       <ui:repeat id="entries" var="_entry" value="#{test.entries}">
           <p:outputPanel id="counterPanel">
               <h:outputText value="#{test.counter}" />
           </p:outputPanel>
   
           <p:dataTable var="_p" id="paramTable" value="#{_entry.params}">
               <p:column headerText="Options">
                   <p:commandLink value="Update" update=":form:entries:counterPanel" />
               </p:column>
           </p:dataTable>
       </ui:repeat>
   </h:form>
   

2. Move the <h:form> to inside the outer loop so that you can use @form:

   <ui:repeat var="_entry" value="#{test.entries}">
       <h:form id="form">
           <p:outputPanel id="counterPanel">
               <h:outputText value="#{test.counter}" />
           </p:outputPanel>
   
           <p:dataTable var="_p" id="paramTable" value="#{_entry.params}">
               <p:column headerText="Options">
                   <p:commandLink value="Update" update="@form" />
               </p:column>
           </p:dataTable>
       </h:form>
   </ui:repeat>