Accessing fieldset and legend for radio buttons

[weierophinney]

An element's label can get attributes, e.g. class. Theoretically this behavior is also possible for radio buttons. But the setLabelAttributes(['class' => 'my_class']) called on a Zend\Form\Element\Radio object sets the attribute(-s) for the input elements and not for the container-element.

And it's not possible to access the fieldset or the legend element, that are "hard-coded" in the Zend\Form\View\Helper\FormRow. (Also the maintaining of a custom view helper for the 135 rows long FormRow#render(...) is not easy.)

It would be nice to be able to set the fieldset's and legend's attributes of radio buttons / multi_checkbox'es (and generally of all elements, affected by this code).

An example of a situation, when it's need, is makring elements as required using the :before CSS pseudo-class. For text fields it can be managed by setting the class attribute for the label. For radio's an access to the fieldset and/or at least to the legend is needed.

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Originally posted by @automatix at zendframework/zend-form#129

[weierophinney]

There appears to be no way to add attributes, such as an id to the generated fieldset that gets created for Element\Radio button, when ['options']['label'] value is used. I can add attributes to the individual <label> tags, or to the individual <input> tags, but not to the enveloping <fieldset> tag.
Currently, I used CSS selectors/pseudo-classes to get around this issue.

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Originally posted by @dennis-fedco at zendframework/zend-form#129 (comment)