I have the google+ button being rendered on my site as follows:
In the JS:
var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
po.src = 'https://apis.google.com/js/plusone.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
In the html:
<g:plusone size="medium" href="https://site.com"></g:plusone>
How can I add a callback to this to detect when the user has clicked? I see the docs here: https://developers.google.com/+/plugins/+1button/#jsapi not seeing how to implement with the current render. Thanks