Путь к файлу в JQuery

 <div class="select"> 
<form> 
<select id="projects"> 
<option value='category1'>Category - 1</option> 
<option value='category2'>Category - 2</option> 
<option value='category3'>Category - 3</option> 
<option value='category4'>Category - 4</option> 
</select> 
</form> 
<script> 
$('select').on('change', function() { 
  fileGet($(this).val()); 
}); 
 
function fileGet(file) { 
  file = file + ".php"; 
  console.log(file); 
  $.ajax({ 
    url: file, 
    cache: false, 
    success: function(html) { 
      $("#container").html(html); 
    } 
  }); 
} 
</script>