Re: JSF, Facelets & Recursion

>  <t:dataTable var="item"
>               value="#{ (isOrderItem==true) ? entity.orderItems : 
> entity.subWorkorders }"
> .....
>               <d:workorder-tree entity="#{item}" isOrderItem="true" />
> .....
>
>  </t:dataTable>

You have a bad combination of build-time and render-time tags: 
http://wiki.java.net/bin/view/Projects/FaceletsFAQ#Why_doesn_t_my_c_if_ui_repeat_ui

You really need a component which supports a hierarchical model, such as 
Tomahawks t:tree2 or the Quipukit treetable:
http://www.teamdev.com/quipukit/component_index.jsf#treetable

Alternatively, if your recursion is going to have a maximum depth, you 
could nest a fixed number of tables and used their rendered attribute to 
display or hide them.

<h:dataTable var="item1">
   <h:dataTable var="item1child" rendered="item1.hasChildren">
      <h:dataTable var="item1childchild"
                   rendered="item1child.hasChildren">

  ....

You could probably take advantage of facelets' tag file or include 
features to reuse some code here, but you have to be very careful when 
mixing build and render-time expressions (as you've discovered).

Roger

> And in another xhtml-page  I have
>
>  
>
>            <d:workorder-tree entity="#{WorkorderBean.woEntity}" 
> isOrderItem="false" />
>
>  
>
>  
>
> Some more explanation:
>
> -          the first call to this fragment displays the sub-workorders
>
> -          each sub-workorder can contain a list of order-items
>
> -          each order-item can contain a list of order-items
>
> -          if an order-item contains an empty list, the div with 
> id="div_#{item.nodeId}" must be empty or not rendered
>
>  
>
> So could someone help to determine what’s wrong with the use and 
> reference my own el variables which causes recursion not to work.
>
>  
>
> Any help greatly appreciated
>
> Many thanks
>
> Kind Regards
>
> Roel
>
>  
>
>  
>
> Roel De Nijs
>
> Consultant
>
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> ------------------------------------------------------------------------
>
> *From:* jacob@xxxxxxxxxx [mailto:jacob@xxxxxxxxxx]
> *Sent:* maandag 21 mei 2007 19:49
> *To:* users@xxxxxxxxxxxxxxxxxxxxx
> *Subject:* RE: JSF, Facelets & Recursion
>
>  
>
> Everytime this issue has come up, it's been traced back to a developer 
> issue with how they were referencing their own EL variables, nothing to 
> do with Facelets/EL/JSF itself.
>
>  
>
>         
>
> Hello all,
>
> I'm working with JSF (MyFaces) and Facelets. I've created a custom 
> facelet (more precise: via a seperate xhtml-file), containing a tomahawk 
> data-table
>
> But one big problem: in this file there is a reference to itselfs, 
> because i have to represent a custom tree structure (with checkboxes to 
> delete and create new nodes/subtrees). so it's seems logical to solve 
> this recursively, but if i do so, i get a stack-overflow-error.
>
> I'm searching and surfing the net for 2-3 days looking for a solution to 
> this problem, but apparently it doesn't exist (while in my opinion this 
> is a very straight forward problem).
>
> and i tried everything i know of:
> - using the rendered-attribute as the step-out-endless-loop thing but 
> i've read that the component tree contains all components and that 
> afterwards the rendered ones are really rendered and the others aren't, 
> so that's not a solution
> - i also tried with some jstl and the ifhandler, but also learned that 
> there is a big difference in when the expression is evaluated.
> - also tried with some dynamic form of the jsfc-attribute, resulting in 
> a "ui : remove" if the component hadn't to be rendered, but also no luck
> - ...
>
> So i was wondering: is there a solution for this or some other things i 
> could try, because it's really frustrating me :censored:
>
> any tips, hints and/or suggestions are more than welcome
> thanks in advance
> Roel
>
>  
>
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