https://www.ametek.de/Scripts/js/reCaptcha.js

1var fieldIdWrpper = window.document.getElementById('fieldIdWrpper').value;
2var fieldId = window.document.getElementById('fieldId').value;
3var captchaPublicKey = window.document.getElementById('captchaPublicKey').value;
4
5var reCaptchaArray = reCaptchaArray || [];
6reCaptchaArray.push(
7    function () {
8        var _captchaInput = window.document.getElementById(fieldId);
9        window.grecaptcha.render(fieldIdWrpper,
10            {
11                'sitekey': captchaPublicKey,
12                'callback': function (token) {
13                    _captchaInput.value = token;
14                },
15                'expired-callback': function (args) {
16                    _captchaInput.value = '';
17                }
18            });
19    }
20);