Tìm kiếm theo điều kiện lựa chọn từ Dropdownlist trong Asp.net

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(Lựa chọn tiêu chí tìm kiếm từ Dropdownlist trong Asp.net) – Chức năng tìm kiếm nhanh giúp người sử dụng nhanh chóng và dễ dàng tìm kiếm thông tin mình cần. Tuy nhiên do chỉ có 1 Textbox để nhập từ khóa nên đôi khi kết quả tìm kiếm ra quá nhiều và có những thông tin không cần thiết. Vậy làm sao để người dùng có thể lựa chọn được những tiêu chí tìm kiếm mong muốn mà vẫn có thể thực hiện nhanh. Bài viết dưới đây sẽ hướng dẫn các bạn cách làm công việc này. Khi chạy ứng dụng nếu người dùng chọn tiêu chí All, ứng dụng sẽ tìm tất cả dữ liệu phù hợp với từ khóa nhập vào và nếu chọn 1 tiêu chí nào đó phần mềm sẽ chỉ tìm dữ liệu trên tiêu chí được chọn.

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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),

@Category varchar(15)

declare @strSQL nvarchar(1000)

declare @strWhere nvarchar(500)

declare @strOrder nvarchar (50)

set @strSQL= 'Select * from Customers'

set @strWhere =' Where 1=1 '

if @Keyword<>'' And @Category='All'

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+'%'')'

if @Keyword<>'' And @Category='CompanyName'

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

if @Keyword<>'' And @Category='ContactName'

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

if @Keyword<>'' And @Category='ContactTitle'

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

if @Keyword<>'' And @Category='Phone'

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

if @Keyword<>'' And @Category='Fax'

set @strWhere= @strWhere +' And (Fax 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.

Imports System.Data.SqlClient

Imports System.Data

Namespace SearchGridViewbyDropDownListTextBox

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))

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

<%@ Page Title="Search GridView by DropDownList and TextBox Value in ASP.Net" Language="vb" MasterPageFile="~/Site.Master" AutoEventWireup="false" EnableEventValidation= "false" CodeBehind="Default.aspx.vb" Inherits="SearchGridViewbyDropDownListTextBox._Default" %>

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

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

</asp:ScriptManager>

<h3>

Search GridView by DropDownList and TextBox Value in ASP.Net

</h3>

<br />

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

<tr>

<td>

<h4>

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

</h4>

</td>

<asp:Label ID="plSearch" runat="server" Text="Search By"></asp:Label>

<asp:DropDownList ID="drpCategory" CssClass="form-control" runat="server" Width="120px">

</asp:DropDownList>

<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>

<tr>

<asp:label id="lblMessage" runat="server" Text="No Data"></asp:label>

</td>

</tr>

</table>

</td>

</tr>

<tr>

<asp:GridView ID="grvObject" runat="server" AllowPaging="true" PageSize="8"

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

BorderWidth="1" AutoGenerateColumns="false" DataKeyNames="CustomerID" 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="CompanyName" HeaderText="CompanyName" />

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

<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>

</asp:GridView>

</td>

</tr>

</table>

</ContentTemplate>

</asp:UpdatePanel>

</asp:Content>

- B5: 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 SearchGridViewbyDropDownListTextBox

{

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

{

#region "ComboData"

private void LoadSearchBy()

{

drpCategory.Items.Clear();

drpCategory.Items.Add(new System.Web.UI.WebControls.ListItem("---All---", "All"));

drpCategory.Items.Add(new System.Web.UI.WebControls.ListItem("CompanyName", "CompanyName"));

drpCategory.Items.Add(new System.Web.UI.WebControls.ListItem("ContactName", "ContactName"));

drpCategory.Items.Add(new System.Web.UI.WebControls.ListItem("ContactTitle", "ContactTitle"));

drpCategory.Items.Add(new System.Web.UI.WebControls.ListItem("Phone", "Phone"));

drpCategory.Items.Add(new System.Web.UI.WebControls.ListItem("Fax", "Fax"));

}

#endregion

#region "Bind Data"

private void BindCustomers()

{

DataTable objBind = new DataTable();

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;

lblTotal.Visible = true;

lblTotal.Text = "Total " + iTotal + " records";

}

else

{

trMessage.Visible = true;

grvObject.Visible = false;

lblTotal.Visible = false;

}

updatePanel.Update();

}

private DataTable BindData()

{

SqlDataProvider objSQL = new SqlDataProvider();

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

return objBind;

}

#endregion

#region "GridView Methods"

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

{

grvObject.PageIndex = e.NewPageIndex;

BindCustomers();

}

#endregion

#region "Event Handles"

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

{

try

{

if (!IsPostBack)

{

LoadSearchBy();

//Default Submit Button

Page.Form.DefaultButton = cmdQuickSearch.UniqueID;

BindCustomers();

}

catch

{

}

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

{

BindCustomers();

}

#endregion

}

VB.NET Code

Namespace SearchGridViewbyDropDownListTextBox

Public Class _Default

Inherits System.Web.UI.Page

#Region "ComboData"

Private Sub LoadSearchBy()

drpCategory.Items.Clear()

With drpCategory

.Items.Add(New System.Web.UI.WebControls.ListItem("---All---", "All"))

.Items.Add(New System.Web.UI.WebControls.ListItem("CompanyName", "CompanyName"))

.Items.Add(New System.Web.UI.WebControls.ListItem("ContactName", "ContactName"))

.Items.Add(New System.Web.UI.WebControls.ListItem("ContactTitle", "ContactTitle"))

.Items.Add(New System.Web.UI.WebControls.ListItem("Phone", "Phone"))

.Items.Add(New System.Web.UI.WebControls.ListItem("Fax", "Fax"))

End With

End Sub

#End Region

#Region "Bind Data"

Private Sub BindCustomers()

Dim objBind As New DataTable

Dim iTotal As Integer = 0

objBind = BindData()

If Not objBind Is Nothing Then

If objBind.Rows.Count > 0 Then

iTotal = objBind.Rows.Count

grvObject.DataSource = objBind

grvObject.DataBind()

trMessage.Visible = False

grvObject.Visible = True

lblTotal.Visible = True

lblTotal.Text = "Total " & iTotal & " records"

Else

trMessage.Visible = True

grvObject.Visible = False

lblTotal.Visible = False

End If

updatePanel.Update()

End If

End Sub

Private Function BindData() As DataTable

Dim objSQL As New SqlDataProvider

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

New ObjectPara("@Category", drpCategory.SelectedValue))

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

BindCustomers()

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

LoadSearchBy()

'Default Submit Button

Page.Form.DefaultButton = cmdQuickSearch.UniqueID

BindCustomers()

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

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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