Getting Null in g-recaptcha-response Google's reCaptcha

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I am trying to implement Google\'s reCaptcha v.2.0 but i am getting null in g-recaptcha-response due to this reCaptcha is not working properly and I am always g

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2条回答

情歌与酒

2021-01-25 22:56

I'm not sure how you're submitting the form without an actual submit button, but I've copy/pasted your code and it works for me. I did change the error arrays into echo to display the else messages.

<!DOCTYPE html>
<html>
    <head>
        <script src="https://www.google.com/recaptcha/api.js"></script>
    </head>
    <body>
        <form action="" method="POST">
            <div class="g-recaptcha" style="margin-left: 230px; margin-top: 40px;" data-sitekey="Your-Public-Site-Key"></div>

            <input type="submit" name="submit" value="Post comment">
        </form>
    </body>
</html>

<?php

    if( isset($_POST['submit']) ) {
        if( isset($_POST['g-recaptcha-response']) && !empty( $_POST['g-recaptcha-response'] ) ) {

            //your site secret key
            $secret = 'Your-Private-Site-Key';

            //get verify response data
            $verifyResponse = file_get_contents('https://www.google.com/recaptcha/api/siteverify?secret='.$secret.'&response='.$_POST['g-recaptcha-response']);

            $responseData = json_decode($verifyResponse);

            if($responseData->success) {

                // My All Logic Here
                echo 'Success Message';
            }
            else {
                echo 'Robot verification failed, please try again.';
            } 
        }
        else {
            echo 'Please click on the reCAPTCHA box.';
        }
    }
?>

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梦毁少年i

2021-01-25 23:13
I've run into the same issue. The strangest part is a client-side call to grecaptcha.getResponse() returns to correct response. For some reason it's just not setting g-recaptcha-response. So my workaround was to set a data-callback function to populate a hidden field with the response and use that server-side instead. The hidden input also helps with ease of client-side validation.
eg:
```
<div class="g-recaptcha" data-callback="captcha_onclick" data-sitekey="######"></div>
<input type="hidden" name="recaptcha" id="recaptchaValidator" />
```
javascript:
```
function captcha_onclick() {
    document.getElementById('recaptchaValidator').value = grecaptcha.getResponse();
}
```
server-side:
```
if(!empty($_POST['recaptcha'])) {
    $captcha = $_POST['recaptcha'];
    ...
}
```
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