I have a signup form with AJAX so that I want to refresh Recaptcha image anytime an error is occured (i.e. username already in use).
I am looking for a code compatible with ReCaptcha to reload it using JavaScript.
For reCaptcha v2, use:
grecaptcha.reset();
If you're using reCaptcha v1 (probably not):
Recaptcha.reload();
This will do if there is an already loaded Recaptcha on the window
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(Updated based on @SebiH's comment below.)