UI Repeat

[bashan]

Hi,

I know this is more of a Facelets question...
Is there a way of using ui repeat tag just as it was a simple indexed for loop?
I mean, I don't want to create a bean and fill it with five items, in order to make a loop from 0 to 4...

Thanks,
Guy.

[sjmenden]

Not with ui:repeat but yes with c:forEach, see https://facelets.dev.java.net/nonav/docs/dev/docbook.html#taglib-available-jstl  so you can do:

<c:forEach begin="0" end="4" varStatus="idx">
  #{idx}
</c:forEach>

[bashan]

Weird, for some reason the c:forEach doesn't work for me. I added the namespace, run a simple loop, wrote some text in the loop and all I see is a single time the text it printed. I assume that facelets simply ignore this tag...

But anyway, I am trying to use t:dataList (like ui:repeat) for now. I am generating a list on the server side. The list is being generated from a facelets component. I pass to the
component a signle parameter:

<n:ratingShow rating="#{video.rating}" />

It seems like this parameter is not accessible on the server.
This is my component:

<span xmlns="http://www.w3.org/1999/xhtml"
      xmlns:ui="http://java.sun.com/jsf/facelets"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:s="http://jboss.com/products/seam/taglib"
      xmlns:t="http://myfaces.apache.org/tomahawk"
      xmlns:c="http://java.sun.com/jsp/jstl/core">
  
  <t:dataList value="#{ratingList}" var="r" rowIndexVar="rowIndex">
    <h:graphicImage url="img/rating/small_#{r}.jpg" />
  </t:dataList>
  </span>

This is the server side code:

@Name("ratingList")
public class RatingAction
{
  @Unwrap
  public List<String> getRatingList()
  {
    double rating = (Double)FacesUtil.getElValue("#{rating}");
    List<String> list = new ArrayList<String>();
    for (int i = 0; i < 5; i++)
    {
      if (rating >= i + 1)
      {
        list.add("full");
      }
      else if (rating >= i + 0.5)
      {
        list.add("half");
      }
      else
      {
        list.add("empty");
      }
    }

    return list;
  }
}

The rating is null. although when printing it from the component xml code, it returns a valid value.

The code I am using to evaluate the expression:

  public static Object evalEl(String expression) {
      String framedExpr = "#{" + expression + "}";
      Object value = Expressions.instance().createValueExpression(framedExpr).getValue();
      return value;
    }

[bashan]

Sorry, I forgot to ask the final question... ;-)
Is there a reason the rating is not being evaluated in the Java code? Should there be some other code to evaluate facelets parameter (if it does it will be a bit not comfortable...).

One more thing the interests me:
When calling the ratingList twice, it actually executes the getRatingList method twice. Is there a way to cause Seam to cache the result for the request and execute the getRatingList only once (I though that this is one of the benfits of using @Unwrap)?

Thanks,
Guy.

[ctomc]

Hello,

you can also try a4j:repeat it has index and everything you need...

the difference between c:forEach and ui:repeat is that c:forEach is content handler and ui:repeat is component..

cheers,
tomaz

[bashan]

Thanks,
Is there any component allowing conditional flow rather than using rendered property?
Does anyone know how to evaluate facelet component parameter in java code?

[tony.herstell1]

<s:fragment> for conditional stuff in your xhtml pages.

[tony.herstell1]

Example

<s:fragment rendered="#{!(identity.loggedIn and s:hasRole('ADMINISTRATOR'))}">
     <div class="centre text_important">
          <h:outputText value="#{messages.status_arena_status}" />
          <s:fragment rendered="#{!(identity.loggedIn and s:hasRole('ADMINISTRATOR'))}">
               <span class="italic small_text">
                              (<h:graphicImage alt="#{messages.status_open}" url="#{basePath}/images/tick.gif" height="10"/><h:outputText value="#{messages.status_open}" />
                    <h:graphicImage alt="#{messages.status_closed}" url="#{basePath}/images/cross.gif" height="10"/><h:outputText value="#{messages.status_closed}" />)
               </span>
          </s:fragment>
     </div>
</s:fragment>

[bashan]

Nice thing, though I don't see here any special properties that I cannot do using simple h:panelGroup.

[bashan]

Sorry, couldn't find any index property in a4j:repeat...

[brachie]

Hi,

what is the difference between <s:fragment> and <s:div> or <s:span> (except for the block and inline type)?

Alexander

[dro_k]

<s:div> conditionally renders its contents wrapped in HTML <div>

<s:span> conditionally renders its contents wrapped in HTML <span>

<s:fragment> conditionally renders its contents without wrapping them in any HTML element

cheers,

Drew