hehe/user/plugins/form/templates/forms/fields/captcha/captcha.html.twig

{% extends "forms/field.html.twig" %}

{% block input %}
    <script>
        var captchaOnloadCallback = function captchaOnloadCallback() {
            grecaptcha.render('g-recaptcha', {
                'sitekey': "{{field.recaptcha_site_key ?: field.recaptcha_site_key ?: config.plugins.form.recaptcha.site_key }}",
                'callback': captchaValidatedCallback,
                'expired-callback': captchaExpiredCallback
            });
        };

        var captchaValidatedCallback = function captchaValidatedCallback() {

        };

        var captchaExpiredCallback = function captchaExpiredCallback() {
            grecaptcha.reset();
        };

        $('form').submit(function(event) {
            if ($(this).has("#g-recaptcha-response").length && $("#g-recaptcha-response").val() === '') {
                event.preventDefault();
                alert("{{grav.language.translate('PLUGIN_FORM.ERROR_VALIDATING_CAPTCHA')}}");
            }
        });
    </script>
    <script src="https://www.google.com/recaptcha/api.js?onload=captchaOnloadCallback&render=explicit&hl={{ grav.language.language }}"
        async defer>
    </script>
    <div class="g-recaptcha" id="g-recaptcha"></div>
{% endblock %}