This doesn't address your exact problem, but 'Dark Side of the Carton' has some excellent code for validating reCAPTCHA via jQuery AJAX which might help.
In summary:
Add the following Javascript:
$(function() {
function validateCaptcha() {
var challengeField = $('input#recaptcha_challenge_field').val(),
responseField = $('input#recaptcha_response_field').val();
// alert(challengeField);
// alert(responseField);
// return false;
var html = $.ajax({
type: 'POST',
url: 'ajax.recaptcha.php',
data: "recaptcha_challenge_field=" + challengeField + "&recaptcha_response_field=" + responseField,
async: false
}).responseText;
if (html.replace(/^\s+|\s+$/, '') == "success") {
$('#captchaStatus').html(' ');
// Uncomment the following line in your application
return true;
} else {
$('#captchaStatus').html(
'Your captcha is incorrect. Please try again'
);
Recaptcha.reload();
return false;
}
}
// Modified as per comments in site to handle event unobtrusively
$('#signup').submit(function() {
return validateCaptcha();
});
});
Then add the ajax.recaptcha.php file which: "outputs only the word “success” if the captcha matches and a message and the response from reCaptchta if it fails. This is important because we are looking for the word success in our validateCaptcha() function."
require_once('/inc/recaptchalib.php');
$publickey = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXX'; // you got this from the signup page
$privatekey = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXX';
$resp = recaptcha_check_answer(
$privatekey,
$_SERVER['REMOTE_ADDR'],
$_POST['recaptcha_challenge_field'],
$_POST['recaptcha_response_field']
);
if ($resp->is_valid) {
?>success< ?
} else {
die(
"The reCAPTCHA wasn't entered correctly. Go back and try it again." .
"(reCAPTCHA said: " . $resp->error . ")"
);
}
The example is in PHP, but I adapted it easily to work with Zope/Python