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

By Unknown - Monday, August 24, 2015 - No Comments

(Tạo Paging Datalist bằng AJAX Slider Extender) – Có nhiều cách để phân trang cho Datalist như sử dụng chức năng có sẵn trong Datalist hoặc xây dựng Control riêng để xử lý công việc này. Để có thêm lựa chọn trong việc phân trang cho Datalist, 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 tại đây và thực hiện công việc Restore Data.

- B2: 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.

C# Code

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Data.SqlClient;

using System.Data;

using System.Configuration;

namespace PagingDatalistUsingSliderExtender

{

public class SqlDataProvider

{

#region "Membres Prives"

private string _connectionString;

#endregion

#region "Constructeurs"

public SqlDataProvider()

{

try

{

_connectionString = ConfigurationManager.ConnectionStrings["SiteSqlServer"].ConnectionString;

}

catch

{

}

#endregion

#region "Proprietes"

public string ConnectionString

{

get { return _connectionString; }

}

#endregion

#region "Functions"

public DataSet FillTable(string sql)

{

try

{

DataSet tb = new DataSet();

SqlDataAdapter adap = new SqlDataAdapter(sql, _connectionString);

adap.Fill(tb);

return tb;

}

catch

{

return null;

}

#endregion

}

VB.NET Code

Imports System.Data.SqlClient

Imports System.Data

Namespace PagingDatalistUsingSliderExtender

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 DataSet

Try

Dim tb As New DataSet

Dim adap As New SqlDataAdapter(sql, _connectionString)

adap.Fill(tb)

Return tb

Catch ex As Exception

Return Nothing

End Try

End Function

#End Region

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.aspx dưới dạng HTML và nhập mã HTML

<%@ Page Title="Paging in Datalist using AJAX SliderExtender in ASP.Net" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="PagingDatalistUsingSliderExtender._Default" %>

<%@ Register Assembly="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 Datalist using AJAX SliderExtender in ASP.Net

</h3>

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

<td>

<asp:Label ID="lblMessage" runat="server"></asp:Label>

</td>

</tr>

<tr>

<td>

<asp:DataList ID="dlObject" runat="server" DataKeyField="ProductID" Width="100%" OnItemCommand="dlObject_ItemCommand">

<tr>

<th align="center" width="200px">ProductName</th>

<th align="center" width="100px">QuantityPerUnit</th>

<th align="center" width="80px">UnitPrice</th>

<th align="center" width="80px">UnitsInStock</th>

<th align="center" width="80px">UnitsOnOrder</th>

</tr>

</HeaderTemplate>

<tr>

<asp:Label ID="lblProductID" runat="server" Visible="false" Text='<%# Eval("ProductID") %>' />

<asp:Label ID="lblProductName" Text='<%# Eval("ProductName") %>' runat="server"></asp:Label>

</td>

<asp:Label ID="lblQuantityPerUnit" Text='<%# Eval("QuantityPerUnit") %>' runat="server"></asp:Label>

</td>

<asp:Label ID="lblUnitPrice" Text='<%# Eval("UnitPrice") %>' runat="server"></asp:Label>

</td>

<asp:Label ID="lblUnitsInStock" Text='<%# Eval("UnitsInStock") %>' runat="server"></asp:Label>

</td>

<asp:Label ID="lblUnitsOnOrder" Text='<%# Eval("UnitsOnOrder") %>' runat="server"></asp:Label>

</td>

</tr>

</ItemTemplate>

<asp:Panel ID="pnlPaging" runat="server" HorizontalAlign="Center" visible="false">

<tr>

<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" OnTextChanged="txtSlider_Changed" Width="200px"></asp:TextBox>

<cc1:SliderExtender ID="ucSliderExtender" runat="server" Orientation="Horizontal" TargetControlID="txtSlider" Minimum="1"></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" />

</td>

</tr>

</table>

</asp:Panel>

</FooterTemplate>

</asp:DataList>

</td>

</tr>

</table>

</ContentTemplate>

</asp:UpdatePanel>

</asp:Content>

- B7: 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;

using AjaxControlToolkit;

namespace PagingDatalistUsingSliderExtender

{

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

{

#region "Private Members"

private PagedDataSource pgd = new PagedDataSource();

private int PageSize = 20;

#endregion

#region "Properties"

private int CurrentPage

{

get

{

object objPage = ViewState["_CurrentPage"];

int _CurrentPage = 0;

if (objPage == null)

{

_CurrentPage = 0;

}

else

{

_CurrentPage = Convert.ToInt32(objPage);

}

return _CurrentPage;

}

set { ViewState["_CurrentPage"] = value; }

}

#endregion

#region "Bind Data"

private void SetPageData()

{

DataSet objBind = new DataSet();

objBind = BindData();

if (objBind != null)

{

pgd.AllowPaging = true;

pgd.DataSource = objBind.Tables[0].DefaultView;

pgd.PageSize = PageSize;

}

private void BindProduct()

{

DataSet objBind = new DataSet();

objBind = BindData();

SetPageData();

if (objBind != null)

{

if (pgd.Count > 0)

{

dlObject.DataSource = pgd;

dlObject.DataBind();

trMessage.Visible = false;

dlObject.Visible = true;

Panel pnlPaging = dlObject.Controls[dlObject.Controls.Count - 1].FindControl("pnlPaging") as Panel;

if (pnlPaging != null)

{

if (objBind.Tables[0].Rows.Count > pgd.PageSize)

{

pnlPaging.Visible = true;

}

else

{

pnlPaging.Visible = false;

}

else

{

trMessage.Visible = true;

dlObject.Visible = false;

lblMessage.Text = "No Data";

}

updatePanel.Update();

TextBox txtSlider = dlObject.Controls[dlObject.Controls.Count - 1].FindControl("txtSlider") as TextBox;

txtSlider.Text = (pgd.CurrentPageIndex + 1).ToString();

AjaxControlToolkit.SliderExtender ucSliderExtender = dlObject.Controls[dlObject.Controls.Count - 1].FindControl("ucSliderExtender") as SliderExtender;

ucSliderExtender.Steps = pgd.PageCount;

ucSliderExtender.Maximum = pgd.PageCount;

Label lblPage = dlObject.Controls[dlObject.Controls.Count - 1].FindControl("lblPage") as Label;

int PageIndex = pgd.CurrentPageIndex + 1;

lblPage.Text = "Page " + PageIndex + " of " + pgd.PageCount;

}

private DataSet BindData()

{

SqlDataProvider objSQL = new SqlDataProvider();

DataSet objBind = objSQL.FillTable("Select Products.* From Products");

return objBind;

}

#endregion

#region "Datalist Methods"

protected void dlObject_ItemCommand(object source, System.Web.UI.WebControls.DataListCommandEventArgs e)

{

SetPageData();

pgd.CurrentPageIndex = CurrentPage;

if (e.CommandName == "First")

{

CurrentPage = 0;

pgd.CurrentPageIndex = 0;

}

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

{

CurrentPage -= 1;

if (pgd.CurrentPageIndex > 0)

{

pgd.CurrentPageIndex = pgd.CurrentPageIndex - 1;

}

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

{

CurrentPage += 1;

if (pgd.CurrentPageIndex < pgd.PageCount - 1)

{

pgd.CurrentPageIndex = pgd.CurrentPageIndex + 1;

}

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

{

CurrentPage = pgd.PageCount - 1;

pgd.CurrentPageIndex = pgd.PageCount - 1;

}

BindProduct();

}

protected void txtSlider_Changed(object sender, EventArgs e)

{

TextBox txtSlider = dlObject.Controls[0].Controls[0].FindControl("txtSlider") as TextBox;

PagedDataSource pgd = new PagedDataSource();

if (txtSlider != null)

{

pgd.CurrentPageIndex = Int32.Parse(txtSlider.Text) - 1;

BindProduct();

}

#endregion

#region "Event Handles"

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

{

try

{

if (!IsPostBack)

{

BindProduct();

}

catch

{

}

#endregion

}

VB.NET Code

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

Imports System.Data

Imports AjaxControlToolkit

Namespace PagingDatalistUsingSliderExtender

Public Class _Default

Inherits System.Web.UI.Page

#Region "Private Members"

Private pgd As New PagedDataSource

Private PageSize As Integer = 20

#End Region

#Region "Properties"

Private Property CurrentPage() As Integer

Get

Dim objPage As Object = ViewState("_CurrentPage")

Dim _CurrentPage As Integer = 0

If objPage Is Nothing Then

_CurrentPage = 0

Else

_CurrentPage = CInt(objPage)

End If

Return _CurrentPage

End Get

Set(ByVal value As Integer)

ViewState("_CurrentPage") = value

End Set

End Property

#End Region

#Region "Bind Data"

Private Sub SetPageData()

Dim objBind As New DataSet

objBind = BindData()

If Not objBind Is Nothing Then

pgd.AllowPaging = True

pgd.DataSource = objBind.Tables(0).DefaultView

pgd.PageSize = PageSize

End If

End Sub

Private Sub BindProduct()

Dim objBind As New DataSet

objBind = BindData()

SetPageData()

If Not objBind Is Nothing Then

If pgd.Count > 0 Then

dlObject.DataSource = pgd

dlObject.DataBind()

trMessage.Visible = False

dlObject.Visible = True

Dim pnlPaging As Panel = dlObject.Controls(dlObject.Controls.Count - 1).FindControl("pnlPaging")

If Not pnlPaging Is Nothing Then

If objBind.Tables(0).Rows.Count > pgd.PageSize Then

pnlPaging.Visible = True

Else

pnlPaging.Visible = False

End If

Else

trMessage.Visible = True

dlObject.Visible = False

lblMessage.Text = "No Data"

End If

updatePanel.Update()

Dim txtSlider As TextBox = dlObject.Controls(dlObject.Controls.Count - 1).FindControl("txtSlider")

txtSlider.Text = pgd.CurrentPageIndex + 1

Dim ucSliderExtender As AjaxControlToolkit.SliderExtender = dlObject.Controls(dlObject.Controls.Count - 1).FindControl("ucSliderExtender")

ucSliderExtender.Steps = pgd.PageCount

ucSliderExtender.Maximum = pgd.PageCount

Dim lblPage As Label = dlObject.Controls(dlObject.Controls.Count - 1).FindControl("lblPage")

lblPage.Text = "Page " & pgd.CurrentPageIndex + 1 & " of " & pgd.PageCount

End If

End Sub

Private Function BindData() As DataSet

Dim objSQL As New SqlDataProvider

Dim objBind As DataSet = objSQL.FillTable("Select Products.* From Products")

Return objBind

End Function

#End Region

#Region "Datalist Methods"

Private Sub dlObject_ItemCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataListCommandEventArgs) Handles dlObject.ItemCommand

SetPageData()

pgd.CurrentPageIndex = CurrentPage

If e.CommandName = "First" Then

CurrentPage = 0

pgd.CurrentPageIndex = 0

ElseIf e.CommandName = "Prev" Then

CurrentPage -= 1

If pgd.CurrentPageIndex > 0 Then

pgd.CurrentPageIndex = pgd.CurrentPageIndex - 1

End If

ElseIf e.CommandName = "Next" Then

CurrentPage += 1

If pgd.CurrentPageIndex < pgd.PageCount - 1 Then

pgd.CurrentPageIndex = pgd.CurrentPageIndex + 1

End If

ElseIf e.CommandName = "Last" Then

CurrentPage = pgd.PageCount - 1

pgd.CurrentPageIndex = pgd.PageCount - 1

End If

BindProduct()

End Sub

Protected Sub txtSlider_Changed(ByVal sender As Object, ByVal e As EventArgs)

Dim txtSlider As TextBox = dlObject.Controls(0).Controls(0).FindControl("txtSlider")

Dim pgd As New PagedDataSource

If Not txtSlider Is Nothing Then

pgd.CurrentPageIndex = Int32.Parse(txtSlider.Text) - 1

BindProduct()

End If

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

BindProduct()

End If

Catch ex As Exception

End Try

End Sub

#End Region

End Class

End Namespace

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