[xwiki-users] Registration Form Validation

Hi - I'm trying to add a checkbox to the account registration form (XWiki Enterprise 3.5). I can add the field so it renders on the form: ## ## The terms of service agreement, checking. #set($field = {'name' : 'tos_agree', 'label' : '<hr />I have read and agree to the above terms of use.', 'params': { 'type' : 'checkbox' } }) #set($discard = $fields.add($field)) However, I would like to validate that the checkbox has been checked before allowing the registration to take place. I do not need to store the checkbox value in the user objects. I've tried several validation variations based upon the examples in the registration code and other places, but nothing has worked, so I thought I would turn to the community for some help. Thanks in advance! -Andrew City of New York