(AJAX AutoCompleteExtender cho Textbox trong 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.
- B1: Tạo CSDL Customers trong SQL Server
- B2: Tạo Bảng Accounts có cấu trúc phía dưới - B1: Tạo CSDL Customers trong SQL Server
| STT | Tên trường | Kiểu trường | Ghi chú |
| 1 | AccountID | Int | Trường tự tăng |
| 2 | AccountCode | nvarchar(25) | |
| 3 | AccName | nvarchar(250) | |
| 4 | AccAddress | nvarchar(250) | |
| 5 | AccPhone | nvarchar(50) | |
| 6 | AccFAX | nvarchar(50) | |
| 7 | AccEmail | nvarchar(50) | |
| 8 | AccWebsite | nvarchar(150) | |
| 9 | AccDesc | nvarchar(1500) | |
| 10 | CreatedDate | datetime | |
| 11 | ModifiedDate | datetime |
- B3: Nhập dữ liệu cho bảng Accounts
- B4: Tạo các stored procedure trong SQL Server
USE [Customers]
GO
CREATE PROCEDURE [dbo].[Pro_Accounts_List]
@Keyword nvarchar(250),
@SortField nvarchar(50),
@SortType nvarchar(10)
AS
declare @strSQL nvarchar(1000)
declare @strWhere nvarchar(500)
declare @strOrder nvarchar (50)
set @strSQL= 'Select * from Accounts'
set @strWhere =' Where 1=1 '
if @Keyword<>''
set @strWhere= @strWhere +' And (AccountCode like N''%' +@Keyword+'%''
Or AccName like N''%' +@Keyword+'%'' Or AccAddress like N''%' +@Keyword+'%''
Or AccPhone like N''%' +@Keyword+'%'' Or AccFAX like N''%' +@Keyword+'%''
Or AccEmail like N''%' +@Keyword+'%'' Or AccWebsite like N''%' +@Keyword+'%'')'
if @SortField='CreatedDate'
Begin
set @strOrder =' Order by CreatedDate'
End
Else
Begin
set @strOrder =' Order by AccName'
End
set @strSQL=@strSQL+@strWhere+@strOrder
print @strSQL
exec sp_executesql @strSQL
Go
Bạn có thể tải về bảng cơ sở dữ liệu SQL bằng cách nhấn vào liên kết tải về dưới đây
- B5: Tạo Project trong Microsoft Visual Studio 2010
Trong Visual Studio tạo 1 Class có tên: Utility và nhập đoạn Code phía dưới cho Class này.
Imports System.Data.SqlClient
Imports System.Data
Namespace
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 sql As String) As DataTable
Try
Dim tb As New DataTable
Dim adap As New SqlDataAdapter(sql, _connectionString)
adap.Fill(tb)
Return tb
Catch ex As Exception
Return Nothing
End Try
End Function
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))
Next
End If
adap.Fill(tb)
Return tb
Catch ex As Exception
Return Nothing
End Try
End Function
Public Function RunSQL(ByVal ProcName As String, ByVal ParamArray Para() As ObjectPara) As Object
Try
Dim _cnn As New SqlConnection(_connectionString)
_cnn.Open()
Dim cmd As New SqlCommand(ProcName, _cnn)
cmd.CommandType = CommandType.StoredProcedure
For Each p As ObjectPara In Para
cmd.Parameters.Add(New SqlParameter(p.Name, p.Value))
Next
Return cmd.ExecuteScalar
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
Chú ý: Thuộc tính SiteSqlServer chính là chuỗi Connect với SQL Server trong file Web.Config
- B6: Download thư viện AjaxControlToolkit tại địa chỉ: Download
- B7: Giải nén AjaxControlToolkit.Binary.NET4, và References Ajaxcontroltoolkit.dll trong thư mục vừa giải nén vào Project.
- B8: Mở file Site.css nhập thêm đoạn Code phía dưới
.CompletionListCssClass
{
margin : 0px!important;
background-color : White;
color : windowtext;
border : buttonshadow;
border-width : 1px;
border-style : solid;
cursor : 'default';
overflow : auto;
font-family:Calibri;
font-size:12px;
text-align : left;
list-style-type : none;
margin-left:0px;
padding-left:5px;
max-height:150px;
width:auto;
}
- B9: Mở file Default.aspxdưới dạng HTML và bổ xung Control
<%@ PageTitle="AJAX AutoCompleteExtender Example in ASP.Net" Language="vb" MasterPageFile="~/Site.Master" AutoEventWireup="false" EnableEventValidation= "false" CodeBehind="Default.aspx.vb"Inherits="AJAXAutoCompleteExtender._Default"%>
<%@ RegisterAssembly="AjaxControlToolkit"Namespace="AjaxControlToolkit"TagPrefix="cc1"%>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<asp:ScriptManager ID="ScriptManager1"EnablePageMethods ="true" runat="server">
</asp:ScriptManager>
<h1>
AJAX AutoCompleteExtender Example in ASP.Net
</h1>
<br />
<asp:UpdatePanel ID="updatePanel"runat="server"UpdateMode="Conditional">
<ContentTemplate>
<table cellpadding="2"cellspacing="3"width="100%">
<tr>
<td>
</td>
<tdalign="right">
<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:ImageButton ID="cmdQuickSearch" runat="server" causesvalidation="false" imageurl="~/images/icon_search.gif"></asp:ImageButton>
<cc1:AutoCompleteExtender ServiceMethod="SearchAccounts" MinimumPrefixLength="2"
CompletionInterval="100"EnableCaching="false"CompletionSetCount="10"
TargetControlID="txtSearch"ID="ucAutoCompleteExtender"CompletionListCssClass="CompletionListCssClass"runat="server"FirstRowSelected="false">
</cc1:AutoCompleteExtender>
</td>
</tr>
<trid="trMessage"runat="server"visible="false">
<td colspan="2">
<asp:Label ID="lblMessage" runat="server" Text="No Data"></asp:Label>
</td>
</tr>
<tr>
<tdcolspan="2">
<asp:GridView ID="grvObject" runat="server" AllowPaging="true" PageSize="8"
CssClass="GridStyle"BorderColor="#cbcbcb"BorderStyle="solid"
BorderWidth="1"AutoGenerateColumns="false"DataKeyNames="AccountID"width="100%">
<AlternatingRowStyleCssClass="GridStyle_AltRowStyle"/>
<HeaderStyle CssClass="GridStyle_HeaderStyle"/>
<RowStyle CssClass="GridStyle_RowStyle"/>
<pagerstyle cssclass="GridStyle_pagination"/>
<Columns>
<asp:TemplateField HeaderText = "Number">
<ItemStyle HorizontalAlign="Center"Width="2%"></ItemStyle>
<ItemTemplate>
<asp:Label ID="lblRowNumber"Text='<%# Container.DataItemIndex + 1 %>' runat="server"/>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField ItemStyle-Width="10%"DataField="AccountCode"HeaderText="AccountCode"/>
<asp:BoundField ItemStyle-Width="15%"DataField="AccName"HeaderText="AccountName"/>
<asp:BoundField ItemStyle-Width="10%"DataField="AccPhone"HeaderText="Phone"/>
<asp:BoundField ItemStyle-Width="10%"DataField="AccFAX"HeaderText="FAX"/>
<asp:BoundField ItemStyle-Width="15%"DataField="AccEmail"HeaderText="Email"/>
</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.IO;
using System.Diagnostics;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Services;
using System.Web.Script.Services;
using AjaxControlToolkit;
namespace AJAXAutoCompleteExtender
{
public partial class _Default : System.Web.UI.Page
{
#region"WebServices"
[WebMethod()]
[ScriptMethod()]
public static List<string> SearchAccounts(string prefixText, int count)
{
DataTable objBind = newDataTable();
List<string> Accounts = new List<string>();
objBind = BindData(prefixText);
if (objBind != null)
{
if (objBind.Rows.Count > 0)
{
foreach (DataRowrow in objBind.Rows)
{
Accounts.Add(row["AccName"].ToString());
}
}
}
return Accounts;
}
#endregion
#region"Bind Data"
private void BindAccount()
{
DataTable objBind = newDataTable();
objBind = BindData(txtSearch.Text);
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();
}
}
public static DataTable BindData(stringKeyword)
{
SqlDataProvider objSQL = newSqlDataProvider();
DataTable objBind = objSQL.FillTable("Pro_Accounts_List", new ObjectPara("@Keyword", Keyword.Trim()), new ObjectPara("@SortField", "CreatedDate"), new ObjectPara("@SortType", "DESC"));
return objBind;
}
#endregion
#region"GridView Methods"
protected voidgrvObject_PageIndexChanging(object sender, System.Web.UI.WebControls.GridViewPageEventArgse)
{
grvObject.PageIndex = e.NewPageIndex;
BindAccount();
}
#endregion
#region"Event Handles"
protected voidPage_Load(object sender, System.EventArgs e)
{
try
{
if (!IsPostBack)
{
//Default Submit Button
Page.Form.DefaultButton = cmdQuickSearch.UniqueID;
BindAccount();
}
}
catch
{
}
}
protected voidcmdQuickSearch_Click(object sender, System.EventArgs e)
{
BindAccount();
}
#endregion
}
}
VB.NET Code
Imports System.Web.Services
Imports System.Web.Script.Services
Imports System.Collections.Generic
Imports AjaxControlToolkit
Namespace AJAXAutoCompleteExtender
Public Class _Default
Inherits System.Web.UI.Page
#Region "WebServices"
<WebMethod()> _
<ScriptMethod()> _
Public Shared Function SearchAccounts(ByValprefixText As String, ByVal count As Integer) As List(Of String)
Dim objBind As New DataTable
Dim Accounts As List(Of String) = New List(Of String)
objBind = BindData(prefixText)
If Not objBind Is Nothing Then
If objBind.Rows.Count > 0 Then
For Eachrow As DataRowIn objBind.Rows
Accounts.Add(row("AccName").ToString)
Next
End If
End If
Return Accounts
End Function
#End Region
#Region "Bind Data"
Private SubBindAccount()
Dim objBind As New DataTable
objBind = BindData(txtSearch.Text)
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
Public Shared Function BindData(ByValKeyword As String) As DataTable
Dim objSQL As New SqlDataProvider
Dim objBind As DataTable = objSQL.FillTable("Pro_Accounts_List", New ObjectPara("@Keyword", Keyword.Trim), _
New ObjectPara("@SortField", "CreatedDate"), _
New ObjectPara("@SortType", "DESC"))
Return objBind
End Function
#End Region
#Region "GridView Methods"
Private SubgrvObject_PageIndexChanging(ByVal sender As Object, ByVal e AsSystem.Web.UI.WebControls.GridViewPageEventArgs) Handles grvObject.PageIndexChanging
grvObject.PageIndex = e.NewPageIndex
BindAccount()
End Sub
#End Region
#Region "Event Handles"
Protected SubPage_Load(ByVal sender AsObject, ByVal e As System.EventArgs) Handles Me.Load
Try
If Page.IsPostBack = False Then
'Default Submit Button
Page.Form.DefaultButton = cmdQuickSearch.UniqueID
BindAccount()
End If
Catch ex As Exception
End Try
End Sub
Private SubcmdQuickSearch_Click(ByVal sender As Object, ByVal e As System.EventArgs) HandlescmdQuickSearch.Click
BindAccount()
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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