//Conditional required rule example $r = new FormRule(FormRuleType::required, $o_fe_dogname, NULL, 'As you have a dog, please tell us its name.'); $r->setCondition(array($o_fe_havedog, 'Yes')); $a_formRules[] = $r; //You can create a Show rule which will keep the field hidden, unless the value of another field is selected. $r = new FormRule(FormRuleType::conditionShow, $o_fe_dogname); $r->setCondition(array($o_fe_havedog, 'Yes')); $a_formRules[] = $r; $o_fe_havecat = new JsonFormBuilder_elementRadioGroup('havecat', 'Do you have a cat?', array('Yes' => 'Yes', 'No' => 'No')); $o_fe_catname = new JsonFormBuilder_elementText('catname', 'Name of Cat'); //Same setup for a radio group $r = new FormRule(FormRuleType::required, $o_fe_catname, NULL, 'As you have a cat, please tell us its name.'); $r->setCondition(array($o_fe_havecat, 'Yes')); $a_formRules[] = $r; $r = new FormRule(FormRuleType::conditionShow, $o_fe_catname); $r->setCondition(array($o_fe_havecat, 'Yes')); $a_formRules[] = $r; $o_fe_buttSubmit = new JsonFormBuilder_elementButton('submit', 'Submit Form', 'submit'); //Set required fields $a_formFields_required = array($o_fe_havedog, $o_fe_havecat, $o_fe_name, $o_fe_email); foreach ($a_formFields_required as $field) { $a_formRules[] = new FormRule(FormRuleType::required, $field); } //Make email field require a valid email address $a_formRules[] = new FormRule(FormRuleType::email, $o_fe_email, NULL, 'Please provide a valid email address'); //CREATE FORM AND SETUP $o_form = new JsonFormBuilder($modx, 'contactForm'); $o_form->setRedirectDocument(3); $o_form->addRules($a_formRules); $o_form->setEmailToAddress($modx->getOption('emailsender')); $o_form->setEmailFromAddress($o_form->postVal('email_address'));