How to add a secondary Ajax submit to a regular node form?

I'm trying to add an Ajax submit to a regular node edit form (Drupal 9). I'm using Field Groups so that there's a series of tabs, and I've added a pair of "buttons" (Right now they're just markup <div>s, but I could change them to real buttons if that's recommended) that users can use to move forward and back through the tabs with some Javascript.

The ask now is that each time the tab focus changes, the form is submitted via Ajax. All the examples I'm finding seem to be doing something other than what I'm after. I've seen examples using completely custom forms, loading forms, and altering fields, but nothing that just adds the ability to submit a a regular node form with Ajax.

Things I've tried:

• Adding an #ajax subarray of various sorts to the buttons and/or the regular submit element. Nothing Ajaxy at all has happened in any of these experiments
• Using Javascript to trigger a click event on the submit, without and without an #ajax subarray. All I get is a regular submit with page refresh
• Bypassing all of that just calling $.post($('#form-id').attr('action'), $('#form-id').serialize()). There's some semblance of Ajax submit going on as my custom hook_form_alter gets hit, but the node isn't saved/updated. I think that's failing because there's no proper submit/op value associated with it, and I haven't been able to figure out how to add/set it.

Can someone point me in the right direction?

Primul punct este singura cale simplă. Un formular obișnuit de editare a nodurilor are deja elemente de formular Ajax. Puteți verifica subbarajul „ajax” al drupal-settings-json livrat în browser.

Ar trebui să vedeți și aici propriul apel invers Ajax:

  „ajax”: {
    „edit-field-article-add-more”: {
      "sună din nou": [
        „Drupal\Core\Field\Plugin\Field\FieldWidget\EntityReferenceAutocompleteWidget”,
        „addMoreAjax”
      ],
      "wrapper": "field-article-add-more-wrapper",
      „efect”: „decolorare”,
      „eveniment”: „în jos”,
      „apăsare taste”: adevărat,
      "prevent": "clic",
      "url": "\/node\/123\/edit?destination=\/admin\/content\u0026ajax_form=1",
      "dialogType": "ajax",
      "Trimite": {
        "_triggering_element_name": "field_article_add_more",
        "_triggering_element_value": "Adăugați un alt articol"
      }
    },
    „edit-field-paragraph-add-more-add-more-button-text”: {
      "sună din nou": [
        „Drupal\paragraphs\Plugin\Field\FieldWidget\InlineParagraphsWidget”,
        „addMoreAjax”
      ],
      ...

Dacă nu, atunci trebuie să depanați PHP pe server. Dacă da, atunci Javascript pe partea clientului.