Prado\Web\UI\WebControls\TReCaptchaValidator::onPreRender PHP Method

    public function onPreRender($param)
    {
        parent::onPreRender($param);
        $cs = $this->Page->getClientScript();
        $cs->registerPradoScript('validator');
        // communicate validation status to the client side
        $value = $this->_isvalid === false ? '0' : '1';
        $cs->registerHiddenField($this->getClientID() . '_1', $value);
        // update validator display
        if ($control = $this->getValidationTarget()) {
            $fn = 'captchaUpdateValidatorStatus_' . $this->getClientID();
            // check if we need to request a new captcha too
            if ($this->Page->IsCallback) {
                if ($control->getVisible(true)) {
                    if (!is_null($this->_isvalid)) {
                        // if the response has been tested and we reach the pre-render phase
                        // then we need to regenerate the token, because it won't test positive
                        // anymore, even if solves correctly
                        $control->regenerateToken();
                    }
                }
            }
            $cs->registerEndScript($this->getClientID() . '::validate', implode(' ', array('function ' . $fn . '(valid)', '{', '  jQuery(' . TJavaScript::quoteString('#' . $this->getClientID() . '_1') . ').val(valid);', '  Prado.Validation.validateControl(' . TJavaScript::quoteString($control->ClientID) . '); ', '}', '', $this->Page->IsCallback ? $fn . '(' . $value . ');' : '', '', 'jQuery("#' . $control->getClientID() . '").on("keyup", ' . TJavaScript::quoteString('#' . $control->getResponseFieldName()) . ', function() { ', $fn . '("1");', '});')));
        }
    }