ASP.NET MVC使用jQuery实现Autocomplete

CREATE TABLE [dbo].[Item]
(
    [Item_nbr] INT IDENTITY(1,1) PRIMARY KEY NOT NULL,
    [ItemName] NVARCHAR(40)
)

GO

INSERT INTO [dbo].[Item] 
(
    [ItemName] 
)
VALUES
(‘Q04-AA-0001‘),(‘Q04-AA-0002‘),(‘Q04-AA-0003‘),(‘Q04-AA-0004‘),(‘Q04-AA-0005‘),
(‘Q04-BB-0001‘),(‘Q04-BB-0002‘),(‘Q04-BB-0003‘),(‘Q04-BB-0004‘),(‘Q04-BB-0005‘),
(‘Q04-CC-0001‘),(‘Q04-CC-0002‘),(‘Q04-CC-0003‘),(‘Q04-CC-0004‘),(‘Q04-CC-0005‘),
(‘Q04-DD-0001‘),(‘Q04-DD-0002‘),(‘Q04-DD-0003‘),(‘Q04-DD-0004‘),(‘Q04-DD-0005‘),
(‘Q04-EE-0001‘),(‘Q04-EE-0002‘),(‘Q04-EE-0003‘),(‘Q04-EE-0004‘),(‘Q04-EE-0005‘),
(‘Q04-FF-0001‘),(‘Q04-FF-0002‘),(‘Q04-FF-0003‘),(‘Q04-FF-0004‘),(‘Q04-FF-0005‘)

GO

CREATE PROCEDURE [dbo].[usp_Item_GetAll]
AS
SELECT [Item_nbr],[ItemName] FROM [dbo].[Item]
GO

$(function () {            
            var cache = {};
            $("#itemName").autocomplete({
                minLength: 0,
                source: function (request, response) {
                    var term = request.term;
                    if (term in cache) {
                        data = cache[term];
                        response($.map(data, function (item) {
                            return {
                                label: item.ItemName,
                                value: item.Item_nbr
                            }
                        }));
                    }
                    else {
                        $.ajax({
                            url: "/July16/Autocomplete",
                            dataType: "json",
                            type: "POST",
                            contentType: "application/json; charset=utf-8",
                            data: JSON.stringify({
                                top: 10,
                                term: request.term
                            }),
                            success: function (data) {
                                if (data.length) {
                                    cache[term] = data ;
                                    response($.map(data, function (item) {
                                        return {
                                            label: item.ItemName,
                                            value: item.Item_nbr
                                        }
                                    }));
                                }
                            }
                        });
                    }
                },
                focus: function (event, ui) {
                    $("#itemName").val(ui.item.label);
                    return false;
                },
                select: function (event, ui) {
                    $("#itemName").val(ui.item.label);
                    $("#itemNbr-id").val(ui.item.value);
                    return false;
                }
            })           
        });