HTML_QuickForm2 / container rules

Hello together, As Alexey suggested subversively, we should discuss about rules in HTML_QuickForm2 containers. Currently, there is no really easy way to create rules that apply to multiple elements in an container/group. We solved a specific problem of ours by summing up all values in the container and applying the rule to it. This doesn't solve problems for non-numeric elements, nor for other rules. What we also try to achieve is setting the error message to the container, not to each of the single items involved. The current implementation of rules in QF2 uses $element->getValue() on the element the rule is associated to. This is something that hinders us to e.g. validate the sum of several elements. A solution to this problem could be that the rule got a callback function that is executed to return the value. The callback would need at least one parameter: The element the rule is attached to. By iterating over the elements, one could calculate the exact value one desires. While this would be handy, it would require a new callback for each setting/combination of elements. Passing an array of elements to be taken into consideration would make it more flexible. That way QF2 could provide some pre-defined oftenly needed functions. An example: I have three elements and want to make sure the sum of two of them is lesser than 5. I'd do that: $form->addRule( 'lte', 'Sum may not be greater than 4', 4, 'valueCallbackFunctionSum', array('number_1', 'number_3') ); the callback 'valueCallbackFunction' would be called with the $form element as first, and the array of elements to get values from as second parameter. It could look like this: function valueCallbackFunctionSum($form, $arElements) { $nSum = 0; foreach ($arElements as $id) { $nSum += $arElements[$id]->getValue(); } return $nSum; } Thouhts on this? -- Regards/Mit freundlichen Grüßen Christian Weiske -= Geeking around in the name of science since 1982 =-

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