How to get a google recaptcha V3 response

Question

I am using Google reCaptcha v3. i am trying to implement it onto my aspx page.When i first load my page i can get a token back. However when i click on a button to process my page it comes back with a "No reCaptcha clients exits". I did do a google search for this and nothing has came up to solve my issue. How can i verify a human or bot interaction?

this is what i have on my aspx page:

<div id="RegistrationForm">
  <input type="text" id="FirstName" runat="server" value="" valtype="required" maxlength="150" />
  <input type="text" id="LastName" runat="server" value="" valtype="required" maxlength="150" />
  <input runat="server" id="Email" type="text" value="" valtype="required;regex:email" maxlength="350"/>
  <input type="hidden" id="g-recaptcha-response" name="g-recaptcha-response"/> <br />
  <div class="g-recaptcha" data-sitekey="SiteKey" data-callback="submit"></div>
  <input id="btnProcessOrder" type="button" name="ProcessOrder" onclick="confirmed = false;capt();" value="Save" />
</div>

this is What i tried

<script src="https://www.google.com/recaptcha/api.js?render=SiteKey"></script>
<script type="text/javascript">
    //so when i load the page it gets my token and i can assign the value to g-recaptcha-response
   grecaptcha.ready(function() {
       grecaptcha.execute('SiteKey', { action: 'homepage' }).then(function (token) {
           console.log(token);
           document.getElementById('g-recaptcha-response').value = token;

  });
});


 Then when i try to verify the response as follows i get the error or it just does nothing:
function capt() {
var response = grecaptcha.getResponse();
$.ajax({
   type: "POST",
   url: 'https://www.google.com/recaptcha/api/siteverify', 
   data: {"secret" : "SecretKey", "response" : response, "remoteip":"localhost"},
   contentType: 'application/x-www-form-urlencoded',
   success: function(data) { console.log(data); }
});// i call this function on my button
}
</script>

Most of the code i found is for php and i can not use that.How do i get this to work correctly?. Your response is highly appreciated

Answer 1

According to the above comments:

You create a render function as following

grecaptcha.render('example3', {
    'sitekey' : 'your_site_key',
    'callback' : verifyCallback,
});

Then to get the response from the captcha you create a variable which will store the data as such:

var verifyCallBack = function(response) { 
    console.log(response); 
};