change attachment customized area onChange occasion

The shape is in publish creating window. Ajax is posting values, however the values doenst renews. The place might be downside ?

Ajax

    <script>
perform dynamic_Select(area, assist, worth)
  {
console.log(area, assist,worth);
  jQuery.ajax({
    sort: "POST",
    url: ajaxurl,
    information:{
             area:    area,
             assist:      assist, 
             worth:    worth,
         },

    error: perform(){alert('Error!')},
    success: perform(){alert(worth)}     

  }); 
 }
 </script>

capabilities.php

add_action('wp_ajax_dynselect', 'update_dynamic_select');
add_filter("attachment_fields_to_save", " update_dynamic_select", null , 2);

 perform update_dynamic_select($area, $assist, $worth) { 

 update_post_meta($assist, $area, $worth);

}

HTML:

<choose assist="104" title="_image_matmenys" onchange="dynamic_Select(this.getAttribute('title'), this.getAttribute('assist') ,this.worth)">
   <choice worth="10x10">10x10</choice>
   <choice worth="20x20" chosen="chosen">20x20</choice>
   <choice worth="30x30">30x30</choice>
</choose>