Enqueue script on logon failure

Question

I have been playing arround for a day and didn't manage to achieve what I want. Is it possible to enqueue a script if user fails (username or password) to login? I checked and played arround with wp_login_failed but no luck so far!

I want to use this function in a popup login form. After login (success or failure) the page refreshes so I want to force pop up show automatically after a failure (user should not manually click the login button again) by adding javascript ( $('#login-dialog').show(); )

Answer 1

I worked out a way to conditionally print a script to the head of the page, but not to actually enqueue it.

The code depends on the presence of the wp_shake_js callback that is conditionally added to the login page on login failure. If that hook is present, the assumption is that the login failed.

Unfortunately, that callback is hooked to login_head which executes after login_enqueue_scripts so you need to print the script, rather than enqueue it.

add_action(
  'login_head',
  function() {
    if (has_action('login_head','wp_shake_js')) {
      echo '<script type="text/javascript">alert("howdy");</script>';
    }
  },
  13
);

I can't help but think there is a better way, but I can't find it (and I am running out of time for WPSE this morning :) ).