Why parametes passed via JSF EL always null?

[amiliosanchez]

In this example:

<a4j:repeat value="#{someList}" var="someValue">
...
<h:selectBooleanCheckbox id="#{someUtil.generateAnIdForAPurpose(someValue)}"
...

The someValue is always null when passed to my generateAnIdForAPurpose method.

My application is running in JBoss 4.2.2, I have tried implementing the Seam component as both an EJB and POJO. Originally I had it as POJO with stateless scope and bypassing interceptors.

I went up to the point of trying it as a stateful EJB with application scope in attempt to get it to work.

I assume there is something on the client end that I'm not aware of that is causing this?

[amiliosanchez]

anyone?

[luxspes]

what control do you use for submit?

[matt.drees]

Amilio Sanchez wrote on Dec 10, 2008 20:47:

<a4j:repeat value="#{someList}" var="someValue">
...
<h:selectBooleanCheckbox id="#{someUtil.generateAnIdForAPurpose(someValue)}"
...

Yeah, I don't think you can do that.
The id expression only gets evaluated once; there's only one HtmlSelectBooleanCheckbox component in the component tree.  When the page renders, this component will be asked to render itself multiple times, but there's only one component.
So the id can't be row-dependent.

[chris.simons]

I agree; don't think it's possible.  However, could you use an a4j:actionParam here on someValue and set it to your backing bean?

For example, I did something similar here:

<rich:dataTable
               id="contactTypes"
               var="contactTypes"
               value="#{eventManager.getEventContactTypes()}"
               rendered="true"
               rowClasses="evenRows"
               sortMode="single"
               width="#{globals['dataTable.width.default']}"
               rows="#{englinkUtil.getDefaultDataTableRows(facesContext, null)}">
<!-- columns -->
               

<a4j:commandLink 
     value="Add User"
     action="#{userPicker.initPicker('eventManager.addContact')}"
     onclick="#{rich:component('defaultUserPickerModal')}.show()">
<a4j:actionparam name="selectedContactTypeId" value="#{contactTypes.id}"
assignTo="#{eventManager.selectedContactTypeId}"/>
</a4j:commandLink>

[amiliosanchez]

Thanks for the suggestions I'll try them out and let you know.