to render the reCAPTCHA on the front-end.
<html>
<head>
<title>Google recapcha v3 demo</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script src="https://www.google.com/recaptcha/api.js?render=******YOUR-SITE-KEY******"></script>
</head>
<body>
<h1>Google reCAPTHA Demo</h1>
<form id="comment_form">
<input type="email" name="email" placeholder="Type your email" size="40"><br><br>
<textarea name="comment" rows="8" cols="39"></textarea><br><br>
<input type="submit" name="submit" value="Post comment"><br><br>
</form>
<script src="script.js"></script>
</body>
</html>
replace ******YOUR-SITE-KEY****** with your site key.
$('#comment_form').submit(function() {
// we stoped it
event.preventDefault();
var email = $('#email').val();
var comment = $("#comment").val();
// wait for recaptacha ready
grecaptcha.ready(function() {
// do request for recaptcha token
// response is promise with passed token
grecaptcha.execute('******YOUR-SITE-KEY******', {action: 'create_comment'}).then(function(token) {
// add token to form
$('#comment_form').prepend('<input type="hidden" name="g-recaptcha-response" value="' + token + '">');
$.post("form.php",{email: email, comment: comment, token: token}, function(result) {
if(result.success) {
alert('Thanks for posting comment.')
} else {
alert('You are spammer ! Get the @$%K out.')
}
});
});
});
});
replace ******YOUR-SITE-KEY****** with your site key.
On the server-side we are going to use PHP for now. So on the Form submit, we will check the POST variable.
<?php
$email;$comment;$captcha;
$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);
$comment = filter_input(INPUT_POST, 'comment', FILTER_SANITIZE_STRING);
$captcha = filter_input(INPUT_POST, 'token', FILTER_SANITIZE_STRING);
if(!$captcha){
echo '<h2>Please check the captcha form.</h2>';
exit;
}
$secretKey = "******YOUR-SECRET-KEY******";
$ip = $_SERVER['REMOTE_ADDR'];
// post request to server
$url = 'https://www.google.com/recaptcha/api/siteverify';
$data = array('secret' => $secretKey, 'response' => $captcha, 'remoteip' => $ip);
$options = array(
'http' => array(
'header' => "Content-type: application/x-www-form-urlencoded\r\n",
'method' => 'POST',
'content' => http_build_query($data)
)
);
$context = stream_context_create($options);
$response = file_get_contents($url, false, $context);
$responseKeys = json_decode($response, true);
header('Content-type: application/json');
if($responseKeys["success"] && $responseKeys["action"] === "create_comment" && $responseKeys["score"] >= 0.5) {
echo json_encode(array('success' => 'true'));
} else {
echo json_encode(array('success' => 'false'));
}
?>
replace ******YOUR-SECRET-KEY****** with your secret key.
Last Updated: Oct 15, 2024
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