Backend\Modules\FormBuilder\Actions\Add::validateForm PHP Method

    private function validateForm()
    {
        if ($this->frm->isSubmitted()) {
            $this->frm->cleanupFields();
            // shorten the fields
            $txtName = $this->frm->getField('name');
            $txtEmail = $this->frm->getField('email');
            $ddmMethod = $this->frm->getField('method');
            $txtSuccessMessage = $this->frm->getField('success_message');
            $txtIdentifier = $this->frm->getField('identifier');
            $emailAddresses = (array) explode(',', $txtEmail->getValue());
            // validate fields
            $txtName->isFilled(BL::getError('NameIsRequired'));
            $txtSuccessMessage->isFilled(BL::getError('SuccessMessageIsRequired'));
            if ($ddmMethod->isFilled(BL::getError('NameIsRequired')) && $ddmMethod->getValue() == 'database_email') {
                $error = false;
                // check the addresses
                foreach ($emailAddresses as $address) {
                    $address = trim($address);
                    if (!\SpoonFilter::isEmail($address)) {
                        $error = true;
                        break;
                    }
                }
                // add error
                if ($error) {
                    $txtEmail->addError(BL::getError('EmailIsInvalid'));
                }
            }
            // identifier
            if ($txtIdentifier->isFilled()) {
                // invalid characters
                if (!\SpoonFilter::isValidAgainstRegexp('/^[a-zA-Z0-9\\.\\_\\-]+$/', $txtIdentifier->getValue())) {
                    $txtIdentifier->setError(BL::getError('InvalidIdentifier'));
                } elseif (BackendFormBuilderModel::existsIdentifier($txtIdentifier->getValue())) {
                    // unique identifier
                    $txtIdentifier->setError(BL::getError('UniqueIdentifier'));
                }
            }
            if ($this->frm->isCorrect()) {
                // build array
                $values['language'] = BL::getWorkingLanguage();
                $values['user_id'] = BackendAuthentication::getUser()->getUserId();
                $values['name'] = $txtName->getValue();
                $values['method'] = $ddmMethod->getValue();
                $values['email'] = $ddmMethod->getValue() == 'database_email' ? serialize($emailAddresses) : null;
                $values['success_message'] = $txtSuccessMessage->getValue(true);
                $values['identifier'] = $txtIdentifier->isFilled() ? $txtIdentifier->getValue() : BackendFormBuilderModel::createIdentifier();
                $values['created_on'] = BackendModel::getUTCDate();
                $values['edited_on'] = BackendModel::getUTCDate();
                // insert the item
                $id = BackendFormBuilderModel::insert($values);
                // trigger event
                BackendModel::triggerEvent($this->getModule(), 'after_add', array('item' => $values));
                // set frontend locale
                FL::setLocale(BL::getWorkingLanguage(), true);
                // create submit button
                $field['form_id'] = $id;
                $field['type'] = 'submit';
                $field['settings'] = serialize(array('values' => \SpoonFilter::ucfirst(FL::getLabel('Send'))));
                BackendFormBuilderModel::insertField($field);
                // everything is saved, so redirect to the editform
                $this->redirect(BackendModel::createURLForAction('Edit') . '&id=' . $id . '&report=added&var=' . rawurlencode($values['name']) . '#tabFields');
            }
        }
    }