As I understand it (this is quite likely to be a facelets centric view ;) )
| // Your code
| ...
| <h:dataTable value="#{dataModel}" var="row">
| <h:column>#{row.col1}</h:column>
| <h:column>#{row.col2}</h:column>
| </h:dataTable>
|
| <c:forEach items="#{list}" var="row">
| #{row.col1} #{row.col2}
| </c:forEach>
| ...
|
When the component tree is created (compile-time) components like dataTable are
added to the tree without the backing list being read (i.e. a single instance)
whilst forEach's backing list is evaluated (so if there are x items in the
c:forEach list then x copies of forEach's children would be added).
i.e.
| // After tree compile - pseudo-code (if list has 3 items)
| ...
| <h:dataTable value="#{dataModel}" var="row">
| <h:column>#{row.col1}</h:column>
| <h:column>#{row.col2}</h:column>
| </h:dataTable>
|
| #{row1.col1} #{row1.col2}
| #{row2.col1} #{row2.col2}
| #{row3.col1} #{row3.col2}
| ...
|
When the tree is rendered dataTable's DataModel is read and a row for each item
in the list is written.
|
| // After tree render - pseudo-code (if dataModel has 3 items)
| ...
| <h:column>#{row1.col1}</h:column><h:column>#{row1.col2}</h:column>
| <h:column>#{row2.col1}</h:column><h:column>#{row2.col2}</h:column>
| <h:column>#{row3.col1}</h:column><h:column>#{row3.col2}</h:column>
|
| #{row1.col1} #{row1.col2}
| #{row2.col1} #{row2.col2}
| #{row3.col1} #{row3.col2}
| ...
|
In essence the component tree will hold an item per child of forEach and an
item per dataTable - hence why dataTable is a lighter weight pattern.
It didn't work for you as the dataTable's is evaluated AFTER forEach - so the
'var' items of dataTable aren't created when forEach is evaluated ;)
Peter
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