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I wan't to alter contact form recipient according to what user chose in one of the dropdown fields of my Contact form.

I implemented hook_form_FORM_ID_alter() in order to add custom submit callback like this

 $form['actions']['submit']['#submit'][] = 'my_custom_callback';

to get submitted data.

I thought I could use State API in my_custom_callback() to store received data temporally and use it's value in hook_mail_alter() but it looks like hook_mail_alter() is called before my custom callback.

This is what the order of callbacks looks like:

  1. Default Submit callback of Contact form;
  2. hook_mail_alter();
  3. my_custom_callback.

I wander if there is any way to change this order to this:

  1. my_custom_callback;
  2. Default Submit callback of Contact form;
  3. hook_mail_alter().
1

Why do you need a submit callback at all? The built contact message is available in hook_mail_alter(), you can just access the submitted data there?

This is from a custom project where we did something similar:

/**
 * Implements hook_mail_alter().
 */
function yourmodule_mail_alter(&$message) {
  if ($message['id'] == 'contact_page_mail') {
    /** @var \Drupal\contact\Entity\Message $contact_message */
    $contact_message = $message['params']['contact_message'];

    if ($contact_message->bundle() != 'feedback') {
      return;
    }

    $recipient_address = $contact_message->get('yourfield')->value;
    if (\Drupal::service('email.validator')->isValid($recipient_address)) {
      $message['to'] = $recipient_address;
    }
  }
}
0

I would store the relevant values for sending the mail in a temporary table when my_custom_callback is executed, and then process the data in this table using a cron job or batch job. Batch would probably be better - gives you the tools to lock records, etc. You could run the batch using a cron job :)

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