Форум

var $btn_name = $(this).find('button[type="submit"]').attr('name');
var $btn_val = $(this).find('button[type="submit"]').attr('value');
var $dataForm = $(this).serialize() + "&" + $btn_name + "=" + $btn_val;

$.ajax({
    url: $(this).attr('action'),
    type: 'post',
    context: this,
    data: $dataForm,

    success: function(response){

      console.log(response);

    }
});

  var formData = new FormData(this);

  $.ajax({
    url: $(this).attr('action'),
    type: 'post',
    data: formData,
    cache: false,
    processData: false,
    contentType: false,

    success: function(response){

      console.log(response);

    }
  }); 

<?if ($arResult["isFormNote"] != "Y")
{
?>

<fo rm class="ajax-form" name="<?=$arResult["WEB_FORM_NAME"]?>" action="<?=POST_FORM_ACTION_URI?>" method="POST" enctype="multipart/form-data" novalidate>
   <input type="hidden" name="WEB_FORM_ID" value="<?=$arParams["WEB_FORM_ID"]?>">
   <?=bitrix_sessid_post()?>
   
    <!-- Внутри находятся поля формы -->

<?=$arResult["FORM_FOOTER"]?>
<?
} //endif (isFormNote)
else {
  ?>
    <?=$APPLICATION->RestartBuffer();?>
    <?=FormatHelper::Success('Спасибо! Ваша заявка принята!');?>
    <?die();?>
  <?
}