带有选择标记导轨的ajax 4

I am using rails 4 to make an app like craigslist. I have a list of items on my index page. I am trying to create a dropdown select with options 'price', 'Most recent' so that users can sort the items based on these. Now, i need to send an ajax request to my '/items' url with params 'price' or 'most recent'. I have tried a lot of things but none have worked so far and i am completely stuck. This is the latest code i have. Are there any UBJ parameters i can use to accomplish this? I am new to rails and especially ajax, any help would be appreciated? Thanks in advance.

<script>
     $('#sort_by').on('change',function()
     {
         $.ajax({ type: "GET",
           url: "/items",
           data: {sort: $(this).val();},
           return false
         })
     }
</script>

Try this

$('#sort_by').on('change', function(){
  $.ajax({ type: "GET",
     url: "/items",
     data: { sort: $('option:selected', this).val() }
  }).done(function(data) {
    console.log(data);
  });
});

$('#sort_by').on('change', function(){
    $.ajax({ type: "GET",
        url: "/items",
        data: { sort: $('option:selected', this).val() },
        dataType : "script"
    }).done(function(data) {
        console.log(data);
    });
});