Sử dụng jQuery Autocomplete trong Asp.net

By Unknown - Wednesday, July 8, 2015 - No Comments

(jQuery Autocomplete using Web Service in ASP.Net) – Để gợi ý giúp người sử dụng lựa chọn những từ khóa phù hợp cần tìm kiếm, các Website thường tích hợp chức năng Autocomplete tại Textbox gõ từ khóa. Khi gõ một vài ký tự đầu của từ khóa, tính năng Autocomplete sẽ liệt kê một danh sách nội dung thỏa mãn từ khóa đã nhập vào. Bài viết dưới đây sẽ hướng dẫn các bạn cách sử dụng AJAX AutoCompleteExtender, mỗi khi gõ từ khóa vào Textbox một danh sách tên khách hàng sẽ xuất hiện để người dùng lựa chọn.

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- B1: Download CSDL Northwind tại đây và thực hiện Restore Data.

- B2: Sửa stored procedure CustOrdersDetail

USE [Northwind]

ALTER PROCEDURE [dbo].[CustOrdersDetail]

@Keyword nvarchar(250),

@OrderID int,

@ProductID int

SELECT Top 100 ProductName,

CategoryName,

UnitPrice=ROUND(Od.UnitPrice, 2),

Quantity,

Discount=CONVERT(int, Discount * 100),

ExtendedPrice=ROUND(CONVERT(money, Quantity * (1 - Discount) * Od.UnitPrice), 2)

FROM Products P, [Order Details] Od, Categories C

WHERE Od.ProductID = P.ProductID And P.CategoryID =C.CategoryID

And (@Keyword='' Or ProductName Like N'%'+ @Keyword+ '%')

And (@OrderID=-1 Or Od.OrderID = @OrderID)

And (@ProductID=-1 Or Od.ProductID = @ProductID)

ORDER BY ExtendedPrice DESC

CREATE PROCEDURE [dbo].[Pro_Products_List]

@Keyword nvarchar(250)

declare @strSQL nvarchar(1000)

declare @strWhere nvarchar(500)

declare @strOrder nvarchar (50)

set @strSQL= 'SELECT Products.ProductID, Products.ProductName from Products'

set @strWhere =' Where 1=1 '

if @Keyword<>''

set @strWhere= @strWhere +' And (ProductName like N''%' +@Keyword+'%'')'

set @strOrder =' Order by Products.ProductName'

set @strSQL=@strSQL+@strWhere+@strOrder

print @strSQL

exec sp_executesql @strSQL

Bạn có thể tải về bảng cơ sở dữ liệu SQL bằng cách nhấn vào liên kết tải về dưới đây

- B3: Tạo Project trong Microsoft Visual Studio 2010

Trong Visual Studio tạo thư mục Common và 1 Class có tên: Utility trong thư mục vừa tạo. Nhập đoạn Code phía dưới cho Class này.

VB.NET Code

Imports System.Data.SqlClient

Imports System.Data

Namespace DisplayingTotalFooterGridView

Public Class SqlDataProvider

#Region "Membres Prives"

Shared _IsError As Boolean = False

Private _connectionString As String

#End Region

#Region "Constructeurs"

Public Sub New()

Try

_connectionString = ConfigurationManager.ConnectionStrings("SiteSqlServer").ConnectionString

_IsError = False

Catch ex As Exception

_IsError = True

End Try

End Sub

#End Region

#Region "Proprietes"

Public ReadOnly Property ConnectionString() As String

Get

Return _connectionString

End Get

End Property

#End Region

#Region "Functions"

Public Function FillTable(ByVal ProcName As String, ByVal ParamArray Para() As ObjectPara) As DataTable

Try

Dim tb As New DataTable

Dim adap As New SqlDataAdapter(ProcName, _connectionString)

adap.SelectCommand.CommandType = CommandType.StoredProcedure

If Not Para Is Nothing Then

For Each p As ObjectPara In Para

adap.SelectCommand.Parameters.Add(New SqlParameter(p.Name, p.Value))

End If

adap.Fill(tb)

Return tb

Catch ex As Exception

Return Nothing

End Try

End Function

#End Region

End Class

Public Class ObjectPara

Dim _name As String

Dim _Value As Object

Sub New(ByVal Pname As String, ByVal PValue As Object)

_name = Pname

_Value = PValue

End Sub

Public Property Name() As String

Get

Return _name

End Get

Set(ByVal value As String)

_name = value

End Set

End Property

Public Property Value() As Object

Get

Return _Value

End Get

Set(ByVal value As Object)

_Value = value

End Set

End Property

End Class

End Namespace

Chú ý: Thuộc tính SiteSqlServer chính là chuỗi Connect với SQL Server trong file Web.Config

- B4: Tạo file Service.asmx trong Project

- B5: Mở file Service.asmx và chỉnh sửa mã

<%@ WebService Language="VB" CodeBehind="~/Common/Service.vb" Class="Service" %>

- B6: Trong thư mục Common tạo file Service

- B7: Nhập code cho file Service.vb

C# Code

using System.Collections.Generic;

using System.Data.SqlClient;

using System.Web.Services;

using AutocompleteUsingWebService;

using System.Data;

[WebService(Namespace = "http://tempuri.org/")]

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

[System.Web.Script.Services.ScriptService]

public class WebService : System.Web.Services.WebService {

[WebMethod]

public string[] ListProducts(string keyword)

{

List<string> Products = new List<string>();

SqlDataProvider objSQL = new SqlDataProvider();

DataTable objBind = objSQL.FillTable("Pro_Products_List", new ObjectPara("@Keyword", keyword.Trim()));

if (objBind != null)

{

foreach (DataRow row in objBind.Rows)

{

if (row != null)

{

Products.Add(string.Format("{0}//{1}", row["ProductID"], row["ProductName"]));

}

return Products.ToArray();

}

VB.NET Code

Imports System.Web

Imports System.Web.Services

Imports System.Web.Services.Protocols

Imports System.Web.Script.Services

Imports System.Data.SqlClient

Imports System.Collections.Generic

Imports AutocompleteUsingWebService

<WebService(Namespace:="http://tempuri.org/")> _

<WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _

<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _

<ScriptService()> _

Public Class Service

Inherits System.Web.Services.WebService

<WebMethod()> _

<ScriptMethod(ResponseFormat:=ResponseFormat.Json)> _

Public Function ListProducts(ByVal keyword

As String) As String()

Dim Products As New List(Of String)()

Dim objSQL As New SqlDataProvider

Dim objBind As DataTable = objSQL.FillTable("Pro_Products_List", New ObjectPara("@Keyword", keyword.Trim))

If Not objBind Is Nothing Then

For Each row As DataRow In objBind.Rows

If Not row Is Nothing Then

If Not IsDBNull(row("ProductID")) And Not IsDBNull(row("ProductName")) Then

Products.Add(String.Format("{0}//{1}", row("ProductID"), row("ProductName")))

End If

Return Products.ToArray()

End Function

End Class

- B8: Mở file Site.Master dạng HTML và bổ xung đoạn mã phía dưới trong thẻ Head

- B9: Mở file Default.aspx dưới dạng HTML và nhập mã HTML

<%@ Page Title="jQuery Autocomplete Using WebService in Asp.net" Language="vb" MasterPageFile="~/Site.Master" AutoEventWireup="false" EnableEventValidation= "false" CodeBehind="Default.aspx.vb" Inherits="AutocompleteUsingWebService._Default" %>

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">

function pageLoad() {

$("#<%=txtSearch.ClientID %>").autocomplete({

source: function (request, response) {

$.ajax({

url: '<%=ResolveUrl("~/Service.asmx/ListProducts") %>',

data: "{ 'keyword': '" + request.term + "'}",

dataType: "json",

type: "POST",

contentType: "application/json; charset=utf-8",

success: function (data) {

response($.map(data.d, function (item) {

return {

label: item.split('//')[1],

val: item.split('//')[0]

}

}))

error: function (response) {

alert(response.responseText);

failure: function (response) {

alert(response.responseText);

}

});

select: function (e, i) {

$("#<%=lblItemID.ClientID %>").val(i.item.val);

minLength: 1

});

};

</script>

<asp:ScriptManager ID="ScriptManager1" EnablePageMethods = "true" runat="server">

</asp:ScriptManager>

<h3>

jQuery Autocomplete Using WebService in Asp.net

</h3>

<asp:UpdatePanel ID="updatePanel" runat="server" UpdateMode="Conditional">

<tr>

<td>

</td>

<asp:Label ID="plKeyword" runat="server" Text="Keyword"></asp:Label>

<asp:TextBox ID="txtSearch" CssClass="form-control" ToolTip="Enter Keyword" runat="server" width="200px"></asp:TextBox>

<asp:Label ID="lblItemID" runat="server" Visible="false"></asp:Label>

<asp:ImageButton ID="cmdQuickSearch" runat="server" causesvalidation="false" imageurl="~/images/icon_search.gif"></asp:ImageButton>

</td>

</tr>

<asp:Label ID="lblMessage" runat="server" Text="No Data"></asp:Label>

</td>

</tr>

<tr>

<asp:GridView ID="grvObject" runat="server" AllowPaging="true" PageSize="12" AllowSorting="true"

CssClass="GridStyle" BorderColor="#cbcbcb" BorderStyle="solid"

BorderWidth="1" AutoGenerateColumns="false" width="100%">

<asp:TemplateField HeaderText="Number">

<asp:Label ID="lblRowNumber" Text='<%# Container.DataItemIndex + 1 %>' runat="server" />

</ItemTemplate>

</asp:TemplateField>

<asp:BoundField ItemStyle-Width="18%" DataField="ProductName" HeaderText="ProductName" />

<asp:BoundField ItemStyle-Width="15%" DataField="CategoryName" HeaderText="CategoryName" />

<asp:BoundField ItemStyle-Width="10%" ItemStyle-HorizontalAlign="Right" DataField="UnitPrice" HeaderText="UnitPrice" />

<asp:BoundField ItemStyle-Width="8%" ItemStyle-HorizontalAlign="Right" DataField="Quantity" HeaderText="Quantity" />

<asp:BoundField ItemStyle-Width="8%" ItemStyle-HorizontalAlign="Right" DataField="Discount" HeaderText="Discount" />

<asp:TemplateField HeaderText="Discount">

</asp:TemplateField>

<asp:TemplateField HeaderText="ExtendedPrice">

</asp:TemplateField>

</Columns>

</asp:GridView>

</td>

</tr>

</table>

</ContentTemplate>

</asp:UpdatePanel>

</asp:Content>

- B10: Viết Code cho file Default.aspx

C# Code

//Visit http://www.laptrinhdotnet.com for more ASP.NET Tutorials

using Microsoft.VisualBasic;

using System;

using System.Collections;

using System.Collections.Generic;

using System.Data;

using System.Diagnostics;

namespace AutocompleteUsingWebService

{

public partial class _Default : System.Web.UI.Page

{

#region "Bind Data"

private void BindCustomer()

{

DataTable objBind = new DataTable();

objBind = BindData();

if (objBind != null)

{

if (objBind.Rows.Count > 0)

{

grvObject.DataSource = objBind;

grvObject.DataBind();

trMessage.Visible = false;

grvObject.Visible = true;

}

else

{

trMessage.Visible = true;

grvObject.Visible = false;

}

updatePanel.Update();

}

private DataTable BindData()

{

SqlDataProvider objSQL = new SqlDataProvider();

int ProductID = -1;

if (!string.IsNullOrEmpty(lblItemID.Text))

{

ProductID = Convert.ToInt32(lblItemID.Text);

}

DataTable objBind = objSQL.FillTable("CustOrdersDetail", new ObjectPara("@Keyword", txtSearch.Text), new ObjectPara("@OrderID", -1), new ObjectPara("@ProductID", ProductID));

return objBind;

}

#endregion

#region "GridView Methods"

protected void grvObject_PageIndexChanging(object sender, System.Web.UI.WebControls.GridViewPageEventArgs e)

{

grvObject.PageIndex = e.NewPageIndex;

BindCustomer();

}

#endregion

#region "Event Handles"

protected void Page_Load(object sender, System.EventArgs e)

{

try

{

if (!IsPostBack)

{

Page.Form.DefaultButton = cmdQuickSearch.UniqueID;

BindCustomer();

}

catch

{

}

protected void cmdQuickSearch_Click(object sender, System.EventArgs e)

{

BindCustomer();

}

#endregion

}

VB.NET Code

'Visit http://www.laptrinhdotnet.com for more ASP.NET Tutorials

Namespace AutocompleteUsingWebService

Public Class _Default

Inherits System.Web.UI.Page

#Region "Bind Data"

Private Sub BindCustomer()

Dim objBind As New DataTable

objBind = BindData()

If Not objBind Is Nothing Then

If objBind.Rows.Count > 0 Then

grvObject.DataSource = objBind

grvObject.DataBind()

trMessage.Visible = False

grvObject.Visible = True

Else

trMessage.Visible = True

grvObject.Visible = False

End If

updatePanel.Update()

End If

End Sub

Private Function BindData() As DataTable

Dim objSQL As New SqlDataProvider

Dim ProductID As Integer = -1

If lblItemID.Text <> "" Then

ProductID = lblItemID.Text

End If

Dim objBind As DataTable = objSQL.FillTable("CustOrdersDetail", New ObjectPara("@Keyword", txtSearch.Text.Trim), _

New ObjectPara("@OrderID", -1), _

New ObjectPara("@ProductID", ProductID))

Return objBind

End Function

#End Region

#Region "GridView Methods"

Private Sub grvObject_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles grvObject.PageIndexChanging

grvObject.PageIndex = e.NewPageIndex

BindCustomer()

End Sub

#End Region

#Region "Event Handles"

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

Try

If Page.IsPostBack = False Then

'Default Submit Button

Page.Form.DefaultButton = cmdQuickSearch.UniqueID

BindCustomer()

End If

Catch ex As Exception

End Try

End Sub

Private Sub cmdQuickSearch_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdQuickSearch.Click

BindCustomer()

End Sub

#End Region

End Class

End Namespace

Bây giờ chạy Project bạn sẽ có kết quả như ảnh phía dưới.

Chúc các bạn thành công!

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