app.js

$(document).ready(function() {
  $(".thumbnail").draggable();

  $("#trash").droppable({
    drop: function(event, ui) {
      var id = ui.draggable.attr('id');  
      $.ajax({
        type: "post",
        data: {"_method": "delete"},
        url: "/images/" + id,
        }).done(function(msg) {
          alert("Done");
        });  
    }
  });
});