(Tạo Paging Gridview bằng AJAX Slider Extender) – Có nhiều cách để phân trang cho Gridview như sử dụng chức năng có sẵn trong Gridview hoặc xây dựng Control riêng để xử lý công việc này. Để có thêm lựa chọn trong việc phân trang cho Gridview, hôm nay thủ thuật lập trình sẽ giới thiệu với các bạn 1 cách nữa, đó là sử dụng AJAX Slider Extender.

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- B1: Download CSDL Northwind

- B2: Bổ xung thêm stored procedure trong SQL Server

USE[Northwind]

CREATE PROCEDURE [dbo].[Pro_Customers_List]

@Keyword nvarchar(250)

declare@strSQL nvarchar(1000)

declare @strWhere nvarchar(500)

declare @strOrder nvarchar (50)

set @strSQL= 'Select * from Customers'

set @strWhere =' Where 1=1 '

if @Keyword<>''

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

Or ContactName like N''%' +@Keyword+'%'' Or ContactTitle like N''%' +@Keyword+'%''

Or Address like N''%' +@Keyword+'%'' Or City like N''%' +@Keyword+'%''

Or Region like N''%' +@Keyword+'%'' Or PostalCode like N''%' +@Keyword+'%'')'

set @strOrder =' Order by CompanyName'

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

print @strSQL

exec sp_executesql @strSQL

- B3: 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.

Namespace PagingInGridViewUsingSliderExtender

Public Class SqlDataProvider

#Region "Membres Prives"

Shared _IsError As Boolean = False

Private _connectionString AsString

#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() AsString

Get

Return _connectionString

End Get

End Property

#End Region

#Region "Functions"

Public FunctionFillTable(ByVal sql AsString) As DataTable

Try

Dim tb AsNew DataTable

Dim adap AsNew SqlDataAdapter(sql, _connectionString)

adap.Fill(tb)

Return tb

Catch ex As Exception

Return Nothing

End Try

End Function

Public FunctionFillTable(ByVal ProcName As String, ByVal ParamArrayPara() As ObjectPara) As DataTable

Try

Dim tb AsNew DataTable

Dim adap AsNew SqlDataAdapter(ProcName, _connectionString)

adap.SelectCommand.CommandType = CommandType.StoredProcedure

If NotPara Is NothingThen

For Eachp As ObjectParaIn 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 PropertyName() As String

Get

Return _name

End Get

Set(ByVal value As String)

_name = value

End Set

End Property

Public PropertyValue() 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: Download thư viện AjaxControlToolkit tại địa chỉ: Download

- B5: Giải nén AjaxControlToolkit.Binary.NET4, và References Ajaxcontroltoolkit.dll trong thư mục vừa giải nén vào Project.

- B6: Download các file ảnh tại đây, Copy các ảnh vào thư mục Images của Project.

- B7: Mở file Default.aspxdưới dạng HTML và nhập mã HTML

<%@ PageTitle="Paging in GridView using AJAX SliderExtender in ASP.Net" Language="vb"MasterPageFile="~/Site.Master"AutoEventWireup="false"EnableEventValidation="false" CodeBehind="Default.aspx.vb" Inherits="PagingInGridViewUsingSliderExtender._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>

<h3>

Paging in GridView using AJAX SliderExtender in ASP.Net

</h3>

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

<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>

</td>

</tr>

<trid="trMessage"runat="server"visible="false">

<tdcolspan="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="CustomerID"width="100%">

<AlternatingRowStyleCssClass="GridStyle_AltRowStyle"/>

<asp:TemplateField HeaderText = "Number">

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

</ItemTemplate>

</asp:TemplateField>

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

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

<asp:BoundField ItemStyle-Width="12%" DataField="ContactTitle" HeaderText="ContactTitle" />

<asp:BoundField ItemStyle-Width="12%"DataField="Phone"HeaderText="Phone"/>

<asp:BoundField ItemStyle-Width="12%"DataField="Fax"HeaderText="Fax"/>

</Columns>

<div>

<tr>

</td>

<asp:ImageButton ID="cmdFirst"runat="server"CommandName="First"ImageUrl="~/Images/first.gif"/>

</td>

<asp:ImageButton ID="cmdPrev"runat="server"CommandName="Prev"ImageUrl="~/Images/Prev.gif"/>

</td>

<asp:TextBox ID="txtSlider"runat="server"AutoPostBack="True"

Text='<%# grvObject.PageIndex + 1 %>' OnTextChanged="txtSlider_Changed"Width="200px"></asp:TextBox>

<cc1:SliderExtender ID="ucSliderExtender"runat="server"Orientation="Horizontal"

TargetControlID="txtSlider"Minimum="1"Steps='<%# grvObject.PageCount %>'

Maximum='<%# grvObject.PageCount %>'></cc1:SliderExtender>

</td>

<asp:ImageButton ID="cmdNext"runat="server"CommandName="Next"ImageUrl="~/Images/next.gif"/>

</td>

<asp:ImageButton ID="cmdLast"runat="server"CommandName="Last"ImageUrl="~/Images/last.gif"/>

</td>

<asp:Label ID="lblPage"runat="server"Text='<%# "Page " & (grvObject.PageIndex + 1) & " of " & grvObject.PageCount %>' />

</td>

</tr>

</table>

</div>

</PagerTemplate>

</asp:GridView>

</td>

</tr>

</table>

</ContentTemplate>

</asp:UpdatePanel>

</asp:Content>

- B12: 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.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

using System.Diagnostics;

namespace PagingInGridViewUsingSliderExtender

{

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

{

#region"Bind Data"

private voidBindCustomers()

{

DataTable objBind = newDataTable();

int iTotal = 0;

objBind = BindData();

if (objBind != null)

{

if (objBind.Rows.Count > 0)

{

iTotal = objBind.Rows.Count;

grvObject.DataSource = objBind;

grvObject.DataBind();

trMessage.Visible = false;

grvObject.Visible = true;

}

else

{

trMessage.Visible = true;

grvObject.Visible = false;

}

updatePanel.Update();

}

private DataTableBindData()

{

SqlDataProvider objSQL = newSqlDataProvider();

DataTable objBind = objSQL.FillTable("Pro_Customers_List", new ObjectPara("@Keyword", txtSearch.Text));

return objBind;

}

#endregion

#region"GridView Methods"

protected voidgrvObject_RowCommand(object sender, System.Web.UI.WebControls.GridViewCommandEventArgse)

{

if (e.CommandName == "First")

{

grvObject.PageIndex = 0;

}

else if(e.CommandName == "Prev")

{

if (grvObject.PageIndex > 0)

{

grvObject.PageIndex = grvObject.PageIndex - 1;

}

else if(e.CommandName == "Next")

{

if (grvObject.PageIndex < grvObject.PageCount - 1)

{

grvObject.PageIndex = grvObject.PageIndex + 1;

}

else if(e.CommandName == "Last")

{

grvObject.PageIndex = grvObject.PageCount - 1;

}

BindCustomers();

}

protected voidtxtSlider_Changed(object sender, EventArgs e)

{

TextBox txtCurrentPage = sender as TextBox;

GridViewRow rowPager = grvObject.BottomPagerRow;

if (rowPager != null)

{

TextBox txtSlide = (TextBox)rowPager.Cells[0].FindControl("txtSlider");

grvObject.PageIndex = Int32.Parse(txtSlide.Text) - 1;

BindCustomers();

}

#endregion

#region"Event Handles"

protected voidPage_Load(object sender, System.EventArgs e)

{

try

{

if (!IsPostBack)

{

//Default Submit Button

Page.Form.DefaultButton = cmdQuickSearch.UniqueID;

BindCustomers();

}

catch

{

}

protected voidcmdQuickSearch_Click(object sender, System.EventArgs e)

{

BindCustomers();

}

#endregion

}

VB.NET Code

Namespace PagingInGridViewUsingSliderExtender

Public Class _Default

Inherits System.Web.UI.Page

#Region "Bind Data"

Private SubBindCustomers()

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_Customers_List", New ObjectPara("@Keyword", Keyword.Trim))

Return objBind

End Function

#End Region

#Region "GridView Methods"

Private SubgrvObject_RowCommand(ByVal sender As Object, ByVal e AsSystem.Web.UI.WebControls.GridViewCommandEventArgs) Handles grvObject.RowCommand

If e.CommandName = "First"Then

grvObject.PageIndex = 0

ElseIf e.CommandName = "Prev"Then

If grvObject.PageIndex > 0 Then

grvObject.PageIndex = grvObject.PageIndex - 1

End If

ElseIf e.CommandName = "Next"Then

If grvObject.PageIndex < grvObject.PageCount - 1 Then

grvObject.PageIndex = grvObject.PageIndex + 1

End If

ElseIf e.CommandName = "Last"Then

grvObject.PageIndex = grvObject.PageCount - 1

End If

BindCustomers()

End Sub

Protected SubtxtSlider_Changed(ByVal sender As Object, ByVal e As EventArgs)

Dim txtCurrentPage AsTextBox = TryCast(sender, TextBox)

Dim rowPager As GridViewRow = grvObject.BottomPagerRow

If Not rowPager Is Nothing Then

Dim txtSlide AsTextBox = CType(rowPager.Cells(0).FindControl("txtSlider"), TextBox)

grvObject.PageIndex = Int32.Parse(txtSlide.Text) - 1

BindCustomers()

End If

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

BindCustomers()

End If

Catch ex As Exception

End Try

End Sub

Private SubcmdQuickSearch_Click(ByVal sender As Object, ByVal e As System.EventArgs) HandlescmdQuickSearch.Click

BindCustomers()

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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Sử dụng AJAX Slider Extender cho Paging Gridview trong Asp.net

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