<script src='https://www.google.com/recaptcha/api.js?render=CLAVE_SITIO_WEB'>
</script>
<script>
grecaptcha.ready(function() {
grecaptcha.execute('CLAVE_SITIO_WEB', {action: 'formulario'})
.then(function(token) {
var recaptchaResponse = document.getElementById('recaptchaResponse');
recaptchaResponse.value = token;
});});
</script><script src="https://www.google.com/recaptcha/api.js?render=your reCAPTCHA site key here"></script>
<script>
grecaptcha.ready(function() {
// do request for recaptcha token
// response is promise with passed token
grecaptcha.execute('your reCAPTCHA site key here', {action:'validate_captcha'})
.then(function(token) {
// add token value to form
document.getElementById('g-recaptcha-response').value = token;
});
});
</script><form id="form_id" method="post" action="your_action.php">
<input type="hidden" id="g-recaptcha-response" name="g-recaptcha-response">
<input type="hidden" name="action" value="validate_captcha">
.... your fields
</form>