Support

September 12, 2014 at 11:25 am

There is a hook that fires when the attendee is added to the database, “action_hook_espresso_save_attendee_data”. You could use that to check how many spots are left, and fire off an email to the admin if appropriate. How we, you and the support team, get it done is dependent on your comfort level with php. If you are able to dig into it a bit, then we can help you out by pointing you in the right direction in the forums. If we need to code it up, then it would fall under a small customization that we could do on a couple support tokens. I’m not seeing an email shortcode that would give you the number of spots left available.

September 14, 2014 at 6:58 pm

Basically, you want to have a custom functions plugin like this: https://github.com/sidharrell/EE4custom/blob/master/CustomEE4FunctionsPlugin.php, which is just a file in your plugins folder where you can add a function and hook that function to an action or filter.
In your case, the add action line would be:

add_action('action_hook_espresso_save_attendee_data', 'fire_email_maybe');

and your function would look like:

function fire_email_maybe($attendee_data) {
    if (get_number_of_attendees_reg_limit($attendee_data['event_id'], 'number_available_spaces')<3) {
      // Fire off the email code here
    } 
}