[TYPO3-mvc] new fluid comparator for CheckboxViewhelper

[Thomas Mammitzsch]

Hi list,

i have a suggestion for a new "in_array" comparator in ViewHelperNode. 
Reason is that i'm creating forms in the frontend, where form definition 
happens in the backend. Everything works fine, even if i get validation 
errors, the form shows up prefilled.

The only exception is the CheckboxViewHelper. Because this is an array 
of values (at least if you have multiple checkboxes with the same name 
and different values) you can not compare it against a single value 
currently.
It would be nice if one can check if a value is in that array, to check 
the checkbox in case of validation errors, a return from a 
last-check-before-submit page (or generally when the form of the 
newAction has to be displayed again). I added one case to the 
evaluateComparator method in ViewHelperNode to do that and it works:

case 'in_array':
	return in_array($leftSide, $rightSide);

of course i also added 'in_array' also to the comparators static array 
in ViewHelperNode.
Could we add this permanently, what do you mean?

regards, Thomas