JSF switching image

This is a follow-up to question Using <c:when> with an enumeration

After following the suggestion from the accepted answer, I encountered another problem. The real image path (my code was example code) is partially generated using a library function to get a themed image path. Please understand that I'm not allowed to disclose real code, so I have to cut lots of pieces when I post here.

The first problem is that h:graphicImage automatically generates an absolute image path for the img tag using the current portlet's path. Example: I need http://myserver/mytheme/portlet/image.gif but if I use <h:graphicsImage value="#{myNs:getThemePath()}image.gif" /> it gets rendered as http://myserver/myportlet/mytheme/portlet/image.gif; instead, using <img src="#{myNs:getThemePath()}image.gif" /> works perfectly.

As specified in the other question, I need to switch between images basing on a condition of an iterating item in an ICEFaces table, AND I also need (for accessibility reasons) to place a correct alt attribute with a localized resource.

Briefly, my code resembles the following (ice:dataTable omitted)

<h:column>
    <f:facet name="header">
        <ice:outputText value="#{myNs:getLocale('state')}" />
    </f:facet>
    <img alt="[[TODO]]" src="#{myNs:getThemePath()}#{item.state == 'COMPLETED' ? 'ok' : 'ko'}.gif"
</h:column>

The src part works, but now come the problems.

If I use alt="#myNs:getLocale('prefix.#{item.state = 'COMPLETED' ? 'completed' : 'canceled'}')} I can't nest expressions (it doesn't get evaluated)

If I create two <h:graphicsImage tags for the two cases (no need to use complex expressions in alt) and use the rendered attribute as described in the other question's accepted answer, I don't get the image URL rendered correctly.

I also can't use the <c:when tag because, as explained in the other question, it gets always evaluated to false.

What can I do to meet both requirements? How can I 开发者_如何学JAVAuse two <img tags and switch their rendering according to my condition?

Thanks

[add] Fortunately, I got the following exception message on Tomcat logs when combining expression . Can somebody help me learn EL expressions better? I'm totally new to JSF

Caused by: org.apache.el.parser.ParseException: Encountered "#" at line 1, column 32.
Was expecting one of:
    <INTEGER_LITERAL> ...
    <FLOATING_POINT_LITERAL> ...
    <STRING_LITERAL> ...
    "true" ...
    "false" ...
    "null" ...
    "(" ...
    "!" ...
    "not" ...
    "empty" ...
    "-" ...
    <IDENTIFIER> ...
    <FUNCTION_CALL> ...

To answer the concrete question of the ability to render plain vanilla HTML conditionally; just wrap them in a JSF component which supports the rendered attribute but does by itself output nothing.

<h:panelGroup rendered="#{item.state == 'COMPLETED'}">
    <img src="ok.gif" />
</h:panelGroup>
<h:panelGroup rendered="#{item.state == 'CANCELLED'}">
    <img src="ko.gif" />
</h:panelGroup>

You can also use <ui:fragment> instead when you're using Facelets. It has a bit less overhead.

Looks like I solved it by myself in 10 minutes. Let me share how.

A combined expression is feasible, but simply needs no #{} again!!!! What a dumb (did I say I'm a total beginner?)

#{item.state = 'COMPLETED' ? myNs:getLocale('prefix.completed') myNs:getLocale('prefix.canceled')}

works