Đánh dấu các kết quả tìm kiếm trong Asp.net Gridview

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

(Làm nổi bật các kết quả tìm kiếm phù hợp với từ khóa trong Gridview) – Chức năng tìm kiếm giúp người sử dụng nhanh chóng tìm được thông tin một cách nhanh chóng nhất. Tuy nhiên khi tìm kiếm từ khóa trên nhiều tiêu chí thì người dùng rất khó quan sát để biết trường thông tin nào phù hợp với từ khóa. Giải pháp dưới đây sẽ giúp đánh dấu các kết quả tìm kiếm phù hợp với từ khóa trong Gridview.

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- B1: Download CSDL Northwind

- B2: 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

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 1 Class có tên: Utility và nhập đoạn Code phía dưới cho Class này.

Imports System.Data.SqlClient

Imports System.Data

Namespace SearchRecordsGridViewAndHighlightResults

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: Mở file Site.css và bổ xung thêm thuộc tính dưới

.highlight

{

text-decoration:none;

font-weight:bold;

color:black;

background:#ffff33;

}

- B5: Mở file Default.aspxdưới dạng HTML và nhập mã HTML

<%@ Page Title="Search records in GridView and highlight results in ASP.Net" Language="vb" MasterPageFile="~/Site.Master" AutoEventWireup="false" EnableEventValidation= "false" CodeBehind="Default.aspx.vb" Inherits="SearchRecordsGridViewAndHighlightResults._Default" %>

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

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

</asp:ScriptManager>

<h3>

Search records in GridView and highlight results 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: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" DataKeyNames="CustomerID"

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

<asp:TemplateField HeaderText="Number">

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

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="CompanyName">

<asp:Label ID="lblCompanyName" runat="server" Text='<%# Highlight(Eval("CompanyName").ToString()) %>'/>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="ContactName">

<asp:Label ID="lblContactName" runat="server" Text='<%# Highlight(Eval("ContactName").ToString()) %>'/>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="ContactTitle">

<asp:Label ID="lblContactTitle" runat="server" Text='<%# Highlight(Eval("ContactTitle").ToString()) %>'/>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="Address">

<asp:Label ID="lblAddress" runat="server" Text='<%# Highlight(Eval("Address").ToString()) %>'/>

</ItemTemplate>

</asp:TemplateField>

</Columns>

</asp:GridView>

</td>

</tr>

</table>

</ContentTemplate>

</asp:UpdatePanel>

</asp:Content>

- B6: Viết Code cho file Default.aspx

'Visit http://thuthuatlaptrinh.blogspot.com for more ASP.NET Tutorials

Imports System.Data.SqlClient

Namespace SearchRecordsGridViewAndHighlightResults

Public Class _Default

Inherits System.Web.UI.Page

#Region "Private Methods"

Public Function Highlight(ByVal InputTxt As String) As String

Dim Search_Str As String = txtSearch.Text.ToString()

Dim RegExp As New Regex(Search_Str.Replace(" ", "|").Trim(), RegexOptions.IgnoreCase)

Return RegExp.Replace(InputTxt, New MatchEvaluator(AddressOf ReplaceKeyWords))

RegExp = Nothing

End Function

Public Function ReplaceKeyWords(ByVal m As Match) As String

Return "<span class=""highlight"">" & Convert.ToString(m.Value) & "</span>"

End Function

#End Region

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

New ObjectPara("@Category", "All"))

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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