missing-input-response | Invisible reCaptcha

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So, I'm trying to implement to some website the brand new Invisible reCaptcha by Google.

I am following the steps exactly but it continously gives me missing-input-reponse error.

HTML Code:

<form id="subscribe-form" class="form-inline" action="phpScripts/subscribe/subscribeHandler.php" method="post">
    <div class="input-group">
        <input type="email" name="email" class="form-control" size="50" placeholder="Email Address" required>
        <div class="input-group-btn">
            <button class="g-recaptcha btn btn-danger" data-sitekey="6LfoNhkUAAAAAEcQFx8vGHZKHXsZ_q0j2KDnmU9M" data-callback="submitForm">Subscribe</button>
        </div>
    </div>
</form>

PHP Code:

<?php
include 'databaseConnection.php';
if($_POST){
            $secret = "MY SECRET KEY";
            $captcha= $_POST['g-recaptcha-response'];
            $ip = $_SERVER['REMOTE_ADDR'];
            $url= file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=$secret&response=$captcha&remoteip=$ip");
            print_r($url);
            $decodedResponse = json_decode($url, TRUE);

            if($decodedResponse['success'] == 1){//code here}

So, I'm thinking that my $captcha variable cannot "catch" nothing from the POST of g-recaptcha-response. But why, this is exactly how Google says and exactly as the old reCaptcha v2.

Aswell, i have included <script src='https://www.google.com/recaptcha/api.js'></script>

I was facing the same problem for several hours, until I finally understood the logic behind this "invisible-captcha" ! the reason you don't get a response is simply because there is an empty textarea element with an id and name of g-recaptcha-response this textarea only populates with the response string after the challenge has been completed (which happens normally in the usual recaptcha), but for "invisible-captcha" you must explicitly call grecaptcha.execute(); with your "submit" button, after which the textarea is populated, and your form is automatically submitted (assuming you have bound the submission with your callback function). In my case, I already have php handling the form and recaptcha validation, so I decided to stick with the old "checkbox" version (at least until it gets improved), because I realized it will be really annoying to change everything (form submission logic, button action and JavaScript code) just to hide a checkbox! especially that both methods are nearly the same !

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The issue could be that you're tying the functionality to a button possibly.

Try implementing the code they give you when creating your keys:

<form id="subscribe-form" class="form-inline" action="phpScripts/subscribe/subscribeHandler.php" method="post">
    <div class="input-group">
        <input type="email" name="email" class="form-control" size="50" placeholder="Email Address" required>
        <div class="g-recaptcha" data-sitekey="{keyhere}"></div>  
        <div class="input-group-btn">
            <button class="btn btn-danger" data-sitekey=" data-callback="submitForm">Subscribe</button>
        </div>
    </div>
</form>

For the PHP logic validation:

if ( $_POST['g-recaptcha-response'] ) {
$secret = '{keyhere}';
$response = file_get_contents( "https://www.google.com/recaptcha/api/siteverify?secret=" . $secret . "&response=" . $_POST['g-recaptcha-response'] . "&remoteip=" . $_SERVER['REMOTE_ADDR'] );
        $response = json_decode( $response );
        if ( ! $response->success ) {
            //return error
        }

        //code logic below
}

The div code provided when creating the keys should properly generate all of the HTML from their end to be able to processed by your PHP validation when submitting your form.

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Use grecaptcha.reset() to reset the recaptcha after each execution and all should work just fine. Follow this link for more info on grecaptcha.reset().

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