How to stop Google reCAPTCHA from showing alerts?

Question

I have some forms on the website and google invisible reCAPTCHA. From time to time, something goes wrong and a warning appears: "I can not contact reCAPTCHA. Check the connection and try again." I tried to hide these messages by overriding the warning function:

<script>
    var _alert = window.alert;
    window.alert = function(text) {
        if(text.indexOf("reCAPTCHA") === -1){
            _alert(text);
        }
        return true;
    };
</script>

However, this will not work. Alerts are still displayed. This is the code that I use to call reCAPTCHA. I use the real site key instead of MY_SITE_KEY:

<script>
    var widgetNewsletter;
    var widgetRegistration;
    var captchaCallback = function() {
        widgetNewsletter = grecaptcha.render('subscriptionSubmit', {
            'sitekey' : 'MY_SITE_KEY',
            'callback' : function() {
                document.getElementById("newsletter-validate-detail").submit();
            }
        });
        if(document.getElementById("registerFormSubmit") !== null) {
            widgetRegistration = grecaptcha.render('registerFormSubmit', {
                'sitekey' : 'MY_SITE_KEY',
                'callback' : function() {
                    document.getElementById("form-validate").submit();
                }
            });
        }
    };
</script>
<script src='https://www.google.com/recaptcha/api.js?onload=captchaCallback&render=explicit' async="false" defer></script>

How can I stop warnings?

Answer 1

, render(). , reCAPTCHA ( ) . , :

widgetNewsletter = grecaptcha.render('subscriptionSubmit', {
        'sitekey' : 'MY_SITE_KEY',
        'callback' : function() {
            document.getElementById("newsletter-validate-detail").submit();
        },
        'error-callback': function(){
          //show error message
        }
    });