How to check in js that user has checked the checkbox in Google recaptcha?

Question

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Answer 1

Let the browser do the job for you! (based on slinky2000 answer)

note: this is only to prevent sending an 'accidentally' unchecked recaptcha. You still have to verify the recaptcha on server side because a bot does not care ...

Add a an invisible input tag with required=true attribute just below the div.g-recaptcha.

Enclose both width a div with position=relative; to point the bottom:0; above to the bottom of recaptcha.

Now the Browser asks nicely to fill out this field - pointing to the recapcha.

Now we need the callback:

and

function recaptchaCallback() { 
    $('#recaptcha_check_empty').val(1);
}