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Validator Checkbox validwhen

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Hello, i have a form with a CheckBox field (Cancel) and some fields. I�d like when checkbox is active doesn�t validate other fields but if checkbox isn�t active, other fields must be validate.

One example is the time field. I need time is greater than 0. So, i write:

<var-value>((controles[].anular != true) and (*this* > 0))</var-value>

but if checkbox is active and time is < 0 show the error.

Other example is a address field. It�s required a value in this field except when the checkbox is active. If i write: depends="validwhen,required" then always validate it.

Is it possible this situation validating with Struts?

Sorry for my english, regards.
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