$.each($('td.qty input'), function(i, inpt){ $(inpt).delayedObserver(function() { var id = $(this).attr('id').replace("order_line_items_attributes_", "").replace("_quantity", ""); id = "#order_line_items_attributes_" + id + "_id"; jQuery.ajax({ type: "POST", url: "/admin/orders/" + $('input#order_number').val() + "/line_items/" + $(id).val(), data: ({_method: "put", "line_item[quantity]": $(this).val()}), success: function(html){ $('#order-form-wrapper').html(html)} }); }, 0,5); });