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  • I have played with the ACF JS API and I’ve never been able to get it to work with sub fields when I need to detect a field changing or update sibling fields.

    Instead I have always had to add a change action by targeting the field using jquery and using doing it on my own

    // example event on change of sub field
    // this needs to be on on the document level because rows and be added
    // field_XXXXXX == sub field key to create action for
    $(document).on('change', '[data-key="field_XXXXXX"] .acf-input select', function(e) {
      // get the target of the change
      target = $(;
      // get the row of the repeater
      row = target.closest('.acf-row');
      // get another field in the row
      other_field = row.find('[data-key="field_YYYYY"] input');
      // update value
      other_field.val('new value');
      // trigger change so that ACF knows it has been changed