Explicitly Rendering ReCaptcha - Onload Function Not Firing

I just copied your code, used my own Site Key and it works.

The code I used is:

<html>
  <body>
    <p>ReCaptcha Test</p>

    <div id="recaptcha"></div>

    <script src="https://www.google.com/recaptcha/api.js?onload=recaptchaCallback&render=explicit&hl=iw" async defer></script>

    <script type="text/javascript">
      var recaptchaCallback = function () {
        console.log('recaptcha is ready'); // showing
        grecaptcha.render("recaptcha", {
            sitekey: 'SITE_KEY',
            callback: function () {
                console.log('recaptcha callback');
            }
        });
      }
    </script>

  </body>
</html>

Check your code carefully, as just a single character typo can stop things from working.


Make sure that your onload method is defined before the recaptcha script. Otherwise you will have a race condition where the recaptcha script could be attempting to call your method before it is defined (especially if the recaptcha script is cached).

From the documentation for onload https://developers.google.com/recaptcha/docs/display

Note: your onload callback function must be defined before the reCAPTCHA API loads. To ensure there are no race conditions:

  • order your scripts with the callback first, and then reCAPTCHA
  • use the async and defer parameters in the script tags

For example:

<div id="recaptcha"></div>


<script type="text/javascript">
  var recaptchaCallback = function () {
    console.log('recaptcha is ready'); // not showing
    grecaptcha.render("recaptcha", {
        sitekey: 'SITE_KEY',
        callback: function () {
            console.log('recaptcha callback');
        }
    });
  }
</script>

<script src="https://www.google.com/recaptcha/api.js?onload=recaptchaCallback&render=explicit&hl=iw" async defer></script>

Tags:

Javascript

Html

Recaptcha

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