I use display groups to create "containers" with id attributes to manipulate
them in javascript and I would really appreciate ability to nest display
groups.
I tried something like this (elemX is any form element):
$form->addDisplayGroup(array('elem1','elem2'), 'group1',
array('id'=>'group1'));
$form->addDisplayGroup(array('group1','elem3'), 'group2',
array('id'=>'group2'));
and want result like:
<group2>
<group1>
<elem1><elem2>
</group1>
<elem3>
</group2>
but I just get error "No valid elements specified for display group".
Is there a way to achieve this effect with current Zend_Form? I know that I
can simulate this by using nested sub-forms, but sub-forms are handled
differently and working with them in this way is quite uncomfortable,
because for example you have to set decorators for their elements
individually.
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