Add Google reCaptcha using explicit rendering after an onload callback
(reCaptcha v2 Invisible)
<html>
<head>
<title>reCAPTCHA demo: Explicit render after an onload callback</title>
<script>
var onSubmit = function(token) {
console.log('success!');
};
var onloadCallback = function() {
grecaptcha.render('submit', {
'sitekey' : 'your_site_key',
'callback' : onSubmit
});
};
</script>
</head>
<body>
<form action="?" method="POST">
<input id="submit" type="submit" value="Submit">
</form>
<script src="https://www.google.com/recaptcha/api.js?onload=onloadCallback&render=explicit"
async defer>
</script>
</body>
</html>
