Here is the simplest tutorial by which you can save the acf_form data on ajax_call without the page refresh.
Initially, I expect that you have enough knowledge of acf_form as well as Advance Custom Fields.



STEP :1 Now, Open your page/template file and paste the code given below:

<?php /*
Template Name: acf
*/
 acf_form_head(); ?>
<?php get_header(); ?>

  <div id="primary" class="content-area" style="width: 70%; padding-left: 7%; "> 
  <div id="content" class="site-content" role="main">

      <?php /* The loop */ ?>
      <?php while ( have_posts() ) : the_post(); ?>
        <?php   $args = array(
                              'post_id' => 'YourPostId',
                              'form_attributes' => array(
                              'class' => 'new-campaign-form',
                              'id'=>'modalAjaxTrying'

                              ),
                              'field_groups' => array(2537), //field group id
                              'submit_value' => __("Save and Continue", 'acf'),
                            );
                acf_form( $args );  
         
                
                ?>


        <?php endwhile; ?>
    </div><!-- #content -->

  </div><!-- #primary -->
<?php get_sidebar(); ?>

<?php get_footer(); ?>


STEP : 2 Open your js file and paste the code given below (You can also paste this on the same template page):

<script type="text/javascript">

     jQuery('form#modalAjaxTrying :submit').click(function(event){
    event.preventDefault();
    var form_data = {'action' : 'acf/validate_save_post'};
    jQuery('form#modalAjaxTrying :input').each(function(){
    form_data[jQuery(this).attr('name')] = jQuery(this).val()
    })

    form_data.action = 'save_my_data';
    jQuery.post(ajaxurl, form_data)
    .done(function(save_data){
    alert('Added successFully :');
   
    })

})

   

})

</script>

STEP 3: Open functions.php and add these two actions

add_action( 'wp_ajax_save_my_data', 'acf_form_head' );
add_action( 'wp_ajax_nopriv_save_my_data', 'acf_form_head' );

You're DONE :)
Now save and check. Let me know if you face any error. 

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